JP2734887B2 - Power supply unit for electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-cutting electric discharge machine and a wire for performing electric discharge machining on a workpiece by supplying machining power between an electrode immersed in a machining fluid and the workpiece. The present invention relates to an electric discharge machine such as a cut electric discharge machine, and more particularly to a power supply device for the electric discharge machine.

[0002]

2. Description of the Related Art FIG. 40 is an overall configuration diagram showing an example of a conventional electric discharge machine. In the drawing, reference numeral 1 denotes a processing tank, and 2 denotes a processing liquid, which is made of, for example, a mineral oil containing paraffin hydrocarbon as a main component. Reference numeral 3 denotes a processing table for controlling a relative position between the electrode 5 and the workpiece 4, and is usually driven by a numerical controller (not shown) or the like. 4
Is a workpiece and 5 is an electrode. Reference numeral 6 denotes an electrode feeding means, and the electrode 5 is attached to the lower end. Reference numeral 7 denotes a power supply for supplying electric power for generating a submerged discharge between the electrode 5 and the workpiece 4. Reference numerals 8A and 8B denote power supply lines for supplying electric power from the power source 7 to the electrode 5 and the workpiece 4.

In use, the processing tank 1 is filled with the processing liquid 2 and the electrode 5 attached to the electrode feeding means 6 and the processing table 3
The workpiece 4 attached to the electrode 5 is immersed, and the electrode 5 and the workpiece 4 can be relatively moved by a numerical controller (not shown) or the like. Then, electric power is supplied to the electrode 5 and the workpiece 4 from the power supply 7 located at a distance from the processing tank 1 by the power supply lines 8A and 8B to perform electric discharge machining.

Next, regarding the above-mentioned conventional electric discharge machine,
The operation will be described. FIG. 41 is a circuit diagram of a first case from the power source 7 used in the conventional electric discharge machine to the electrode 5 and the workpiece 4 via the power supply lines 8A and 8B. In the figure, a power supply 7 composed of a switch 11 electrically controlled to be opened and closed by a voltage source 10, a resistor 12 for limiting a machining current, and a diode 13 includes a power supply line 8A,
Electric power is supplied to the electrode 5 and the workpiece 4 at positions separated by 8B, and electric discharge machining is performed by electric discharge generated between the electrode 5 and the workpiece 4.

In this case, there are inductances 14A and 14B in the power supply lines 8A and 8B. By analogy with the inductances 14A and 14B, even if the switch 11 is turned off at high speed, the processing current is equal to the diode 13 and the resistor 1
2, the machining current did not decrease immediately, and the machining current could not be cut off at high speed.

This will be further described with reference to FIG. FIG. 42 is a time chart of a gap voltage and machining current associated with switch control in a circuit used in a conventional electric discharge machine. First, when the switch 11 is turned on at the timing t1 as shown in FIG. 42 (a), the voltage between the electrodes increases as shown in FIG. Is applied. Thereafter, when a discharge occurs between the electrode 5 and the workpiece 4 at timing t3, FIG.
As shown in (c), a processing current i1 which increases exponentially and sequentially flows between the electrode 5 and the workpiece 4. The rise of the machining current i1 is determined by the resistor 12 and the inductances 14A and 14B of the feed lines 8A and 8B. Power supply line 8A,
If the inductances 14A and 14B of 8B are large, the rise of the machining current i1 is delayed.

Next, when the switch 11 is turned off at the timing t2, the processing current i2 sequentially decreases exponentially through the diode 13 and the resistor 12. The gap voltage is the machining current i
It drops sharply at timing t4 when 2 becomes zero. Therefore, since it takes time to rise and decrease the machining current, the machining current cannot be controlled at a high speed with respect to the speed of the discharge phenomenon between the electrode 5 and the workpiece 4, ie, between the electrodes.
That is, since the power source 7 is large and cannot be installed near the electrode 5 and the workpiece 4, the inductances 14A and 14B of the feed lines 8A and 8B are large, and the machining current is controlled at a high speed with respect to the speed of the discharge phenomenon between the electrodes. I couldn't.

Next, the operation of another conventional electric discharge machine will be described. FIG. 43 is a circuit diagram of a second example from the power supply 7 used in the conventional electric discharge machine to the electrode 5 and the workpiece 4 via the power supply lines 8A and 8B. FIG.
In 3, the power supply 7 includes a switch 20, which is electrically switched and controlled by the voltage source 10, a diode 21, a constant current supply unit including a reactor 22, a diode 23, a switch 24, a diode 25, and a voltage source 26. It is constituted by two functions of a constant current interrupting unit.

The power supply 7 supplies power to the electrode 5 and the workpiece 4 at positions separated by the power supply lines 8A and 8B, and performs machining by electric discharge generated between the electrode 5 and the workpiece 4. In this case, the feeding lines 8A and 8B have an inductance of 1
4A and 14B exist. This inductance 14A,
Even if the switch 24 is turned off at a high speed by 14B, the machining current continues to flow through the voltage source 26 and the diode 25, does not immediately decrease, and the machining current cannot be cut off at high speed. Further, since the inductances 14A and 14B exist in the power supply lines 8A and 8B, it is difficult to quickly raise the machining current immediately after the discharge occurs even when the switch 24 is turned on. That is, since the power supply 7 is large and cannot be installed near the electrode 5 and the workpiece 4, the inductances 14A and 14A of the feeders 8A and 8B are provided.
B became large, and the machining current could not be controlled at high speed with respect to the speed of the discharge phenomenon between the electrodes.

Next, the operation of a wire electric discharge machine will be described as a third example of the conventional electric discharge machine. FIG.
4 is a power supply 7 used in a conventional wire electric discharge machine.
FIG. 9 is a circuit diagram of a third example from the power supply lines 8A and 8B to the electrode 5 and the workpiece 4.

Referring to FIG. 1, a power supply 7 includes switches 30 and 31 that are electrically controlled by a voltage source 10 and diodes 32 and 33. The power source 7 is electrically connected to a wire 35 as an electrode 5 located at a position separated by power supply lines 8A and 8B via a power supply 34, and supplies power between the workpieces 4 to supply a wire as the electrode 5. Machining is performed by electric discharge generated between the workpiece 35 and the workpiece 4. In this case, the feeding lines 8A and 8B have inductances 14A and 1
4B exists. Even if the switches 30 and 31 are turned off at high speed by the inductances 14A and 14B, the machining current continues to flow through the diode 33, the voltage source 10, and the diode 32, and does not decrease immediately, but cuts off the machining current at high speed. Can not do. Also, switches 30, 31
Also, it is difficult to quickly raise the machining current immediately after the turning on to generate a discharge.

That is, also in this case, since the power source 7 is large and cannot be installed near the electrode 5 and the workpiece 4, the inductances 14A and 14B of the feed lines 8A and 8B are provided.
And the machining current could not be controlled at high speed with respect to the speed of the discharge phenomenon between the electrodes.

Next, the operation of the electric discharge machine using the coaxial cable 36 as a power supply line will be described. FIG. 45 shows an electric discharge machine according to a fourth conventional example.
FIG. 3 is a circuit diagram of an electric discharge machine using the above. In the figure, the coaxial cable 36 has smaller values of the inductances 14A and 14B as compared with two wires of the same length. For this reason, it is a method often used for an electric discharge machine which controls a machining current at a high speed. The capacity 37 becomes considerably large. Therefore, the capacitance 37 is connected in parallel between the electrode 5 and the workpiece 4, and when a discharge occurs, the amount of electricity stored in the capacitance 37 is discharged as machining power. Finishing processing such as fine processing has problems in that the processed surface roughness is poor and that a coaxial cable with a large current is expensive.

That is, in this case, since the power source 7 is large and cannot be installed near the electrode 5 and the workpiece 4, processing power is supplied by the coaxial cable 36 to avoid the influence of inductance. However, conversely, the influence of the capacitance 37 of the coaxial cable 36 became large, and the machining current could not be controlled at a high speed with respect to the speed of the discharge phenomenon between the electrodes.

Next, as a fifth example of the conventional electric discharge machine, an electric discharge machine disclosed in JP-A-55-42749 will be described. FIG. 46 is a circuit diagram of an electric discharge machine disclosed in the above publication in the fifth conventional example. In the figure, a DC power supply 403 obtained by rectifying a commercial AC power supply, a switch 404 composed of a transistor, and a pulse generation circuit 4 for generating a control pulse for controlling ON / OFF of the switch 404
05, a pulse power supply 400 that generates a processing pulse by switching control of the switch 404 is configured. The pulse power supply 400 is connected to the electrode 5 and the workpiece 4 by a cable 406. This is a form of a general power supply for an electric discharge machine conventionally performed.

Further, a discharge control switch 408 composed of a discharge capacitor 407 and a thyristor is arranged near the electrode 5 and the workpiece 4, and the lead wires for connecting them are shortened and connected. A pulse generation circuit 409 for generating a control pulse for the discharge control switch 408 is controlled independently of or in synchronization with the pulse generation circuit 405. The pulse power supply 400 generates a processing pulse by switching control of the switch 404. This processing pulse is supplied between the electrode 5 and the workpiece 4 via the cable 406. However, the processing pulse is not directly performed, and the processing pulse charges the capacitor 407 via the diode 410. Then, switch 408
Is turned on, the capacitor 407 discharges between the electrode 5 and the workpiece 4 through the switch 408. Therefore,
The processing pulse supplied from the processing pulse power supply 400 is converted into a waveform, and a discharge can be generated between the electrode 5 and the workpiece 4. Thereby, the processing speed is improved.

In this type of case, an auxiliary discharge circuit composed of a capacitor 407 and a switch 408 is added in parallel to a conventional pulse power supply 400 for electric discharge machining, and a discharge pulse current is once charged in the capacitor 407 to charge it. Therefore, the switch 408 is turned on, and a pulse having a high peak value is discharged between the electrode 5 and the workpiece 4.

However, in this electric discharge machine, since an auxiliary electric discharge circuit is added, it is impossible to improve the rise of the electric current in which the pulse of the pulse power supply 400 is discharged between the electrode 5 and the workpiece 4 by the cable 406. Can not. Rather, the pulse power supply 400 is used to charge the capacitor 407.
A completely different discharge pulse from the machining pulse output from the electrode 5 is applied between the electrode 5 and the workpiece 4.

In order to cut off the discharge current, the cable 406 is still connected between the electrode 5 and the work 4, and the switch 4 is connected after the discharge between the electrode 5 and the work 4.
Since 08 is on, the capacitor 407 is in a connected state, and it is impossible to cut off the discharge current at high speed.

[0020]

In a conventional power supply device for an electric discharge machine, a power supply 7 is large, and an electrode 5 and a workpiece 4 are not provided.
, The inductance or capacitance of the power supply lines 8A, 8B wired from the power supply 7 to the electrode 5 and the workpiece 4 becomes large, and the distance between the poles affected by the inductance or capacitance is increased. The machining current could not be controlled at high speed with respect to the speed of the discharge phenomenon. Specifically, the machining current could not be started up at a high speed or interrupted at a higher speed than the discharge phenomenon, so that the current waveform of the machining current caused a large amount of electrode wear. In the finishing process, the surface roughness was poor, and the processing speed was slow. As another prior art, Japanese Patent Laid-Open No. 4-122520
And Japanese Patent Application Laid-Open No. 1-153220. Special
In Japanese Unexamined Patent Publication No. 4-122520, the output of the machining power supply is turned off.
Occurs when switching from on to off during on / off control
Charging the capacitor with a surge
To raise the voltage of the capacitor so that it exceeds a predetermined voltage.
Disclosed the technology to regenerate it to the power supply when it becomes
You. However, it occurs when the machining power is turned from on to off
Charging the capacitor with the surge
Must be boosted by a converter
The path becomes complicated and the equipment becomes more expensive. Also,
In Japanese Unexamined Patent Publication No. 1-153220, the output of the machining power supply is turned off.
Occurs when switching from on to off during on / off control
Energy stored in the
And charge the capacitor voltage to a diode and a chip.
Control the voltage so that it does not exceed the specified voltage.
While regenerating the power to the machining power source is disclosed. Only
However, even in this technology, the output of the machining power
Energy accumulated in the inductance generated when turning off
Charge the capacitor to the capacitor,
Since the voltage is stepped down by a chopper,
The circuit becomes complicated and the device becomes more expensive.

Therefore, the present invention has been made to solve the above-mentioned problems, and has a small electrode consumption.
For example, even in large area processing, processing quality is good, high speed processing is possible , complicated circuit configuration is not required, simple circuit
It is an object to obtain a power supply device for an electric discharge machine which can be realized at low cost .

[0022]

According to a first aspect of the present invention, there is provided a discharge heating apparatus comprising:
The power supply unit for machine tools consists of an electrode immersed in
An electric discharge machine power supply that supplies machining power between objects and performs electric discharge machining
In the source device, a machining current is supplied between the electrode and the workpiece.
A current supply unit for supplying the current to the electrode from the current supply unit;
In addition to intermittently controlling the machining current supplied between workpieces,
Separated from the current supply section and close to the electrode or workpiece.
An intermittent part provided beside and the electric current intermittent from the electric current supply part.
Power supply line for supplying current to the
Reverse bias when supplying between pole and workpiece, supply
Caused by the inductance of the feeder line
Through a diode that becomes a forward bias
A circuit for regenerating power from the current interrupting section to the current supply section;
And a raw wire.

According to a second aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein the current interrupting portion is attached to the structure of the electrode feeding means of the first aspect.

According to a third aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current interrupting portion is provided between the electrode or the electrode and the electrode feeding means.

According to a fourth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current interrupting portion is mounted between the workpiece and the machining table of the first aspect.

According to a fifth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current interrupting portion is attached to the machining table or the lower portion of the machining table.

According to a sixth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein the metal wire according to the first aspect is used as the electrode, and power is supplied to the metal wire via a feeder to process the workpiece into an arbitrary shape. A wire-cut electric discharge machine having a power supply for supplying the current and a current intermittent portion near the workpiece.

According to a seventh aspect of the present invention, there is provided a power supply device for an electric discharge machine, comprising: a current supply unit for supplying a current for machining; A current interrupting unit provided separately from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided near the electrode or the workpiece. , A diode and a resistor. The switch is connected to a workpiece, and a diode is connected between the power supply line side of the switch and a regenerative line.

[0029] In the power supply device for an electric discharge machine according to claim 8, similarly, the current supply unit includes a power supply, a switch, a diode, and a reactor, and the current interrupting unit includes a regenerative wire on the current supply unit side. A capacitor is connected in parallel between them, a switch is connected in series to the power supply line on the side of the current supply unit and connected to the electrode or the workpiece, and a diode is provided between the power supply line side of the switch and a regenerative line. Connected.

According to a ninth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current supply section for supplying a current for machining, and a machining current supplied between the electrode and the workpiece from the current supply section are intermittently controlled. And a current intermittent part provided in the vicinity of the electrode or the workpiece, separated from the current supply part, connected to the current supply part by a power supply line and a regenerative wire, and the current supply part is A power supply, a switch, a diode, and a resistor. The current interrupting unit has a capacitor connected in parallel between the regenerative wires on the current supply unit side, and a switch connected in series on one power supply line on the current supply unit side. Connected to the electrode or the workpiece, and a diode is connected between the other power supply line and the regenerative line.

According to a tenth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current supply section for supplying a current for machining, and a machining current supplied between the electrode and the workpiece from the current supply section are intermittently controlled. And a current intermittent part provided in the vicinity of the electrode or the workpiece, separated from the current supply part, connected to the current supply part by a power supply line and a regenerative wire, and the current supply part is A power supply, a switch, a diode, and a reactor, wherein the current interrupting unit has a capacitor connected in parallel between the regenerative wires on the current supply unit side, and a switch connected in series to one power supply line on the current supply unit side. Connected to the electrode or the workpiece, and a diode is connected between the other power supply line and the regenerative line.

According to another aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current supply section for supplying a current for machining, and a machining current supplied between the electrode and the workpiece from the current supply section are intermittently controlled. And a current intermittent part provided in the vicinity of the electrode or the workpiece, separated from the current supply part, connected to the current supply part by a power supply line and a regenerative wire, and the current supply part is A power supply, a switch, a diode, and a resistor, the current interrupting unit connects a capacitor in parallel between the regenerative wires on the current supply unit side, and supplies a current to a pair of power supply lines on the current supply unit side. A switch is connected in parallel between the electrode and the workpiece, and the switch is connected in series, and a diode is connected between the power supply line and the regenerative line.

A power supply device for an electric discharge machine according to a twelfth aspect of the present invention also includes a current supply section for supplying a current for machining, and an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply section. And a current intermittent part provided in the vicinity of the electrode or the workpiece, separated from the current supply part, connected to the current supply part by a power supply line and a regenerative wire, and the current supply part is A power supply, a switch, a diode, and a reactor, the current interrupting unit connects a capacitor in parallel between the regenerative wires on the current supply unit side, and a pair of power supply lines on the current supply unit side includes the electrode and The work and the switch are connected in parallel, and a diode is connected between the power supply line and the regenerative line.

According to a thirteenth aspect of the present invention, there is provided a power supply device for an electric discharge machine, comprising: a current supply unit for supplying a current for machining; A current interrupting unit provided separately from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided near the electrode or the workpiece. , A diode and a reactor, the current interrupting unit, a capacitor is connected in parallel between the regenerative wires on the current supply unit side, a first switch is connected in series to one power supply line on the current supply unit side,
Further, for the first switch, a second switch connected in parallel between the electrode and the workpiece is connected in series,
In addition, a diode is connected between the power supply line and the regenerative line.

According to a fourteenth aspect of the present invention, there is provided a power supply device for an electric discharge machine, comprising: a current supply unit for supplying a machining current; and an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply unit. A current interrupting unit provided separately from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided near the electrode or the workpiece. , A diode and a reactor, the current interrupting unit connects a capacitor in parallel between the regenerative wires on the current supply unit side, and connects two switches in series and parallel between the power supply lines on the current supply unit side. ,
The electrode and the workpiece are connected in series between the series connection points of two switches, and a diode is connected between the power supply line and the regenerative line.

According to a fifteenth aspect of the present invention, a power supply device for an electric discharge machine includes a current supply unit for supplying a current for machining, an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply unit, A current interrupting unit provided separately from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided near the electrode or the workpiece. , A diode, a reactor, and four switches in which two switches are connected in series / parallel with each other. The series connection point of each two switches is connected to the current interrupting unit with a power supply line, and the current interrupting is performed. The unit includes a capacitor connected in parallel between the regenerative wires on the current supply unit side, a diode bridge connected between the power supply lines on the current supply unit side, and a switch between the connection points of the four bridge-connected diodes. Connect the switch, also connected to the current supply portion side electrode and the workpiece between the feed line of, and, between the regeneration line and the feed line is obtained by connecting a diode.

A power supply device for an electric discharge machine according to a sixteenth aspect of the present invention is a power supply device for supplying a current for machining, and intermittently controls a machining current supplied between the electrode and the workpiece from the current supply portion. A current intermittent portion separated from the current supply portion, connected to the current supply portion by a power supply line and a regenerative line, and provided with a current intermittent portion provided near the electrode or the workpiece; Having a switch connected in parallel between the workpieces, the switch has a differentiating circuit that detects a voltage variation between the electrode and the workpiece, and a comparator that compares an output of the differentiating circuit with a predetermined threshold value; According to an output of the comparator, the switch is turned on for a predetermined time width after a predetermined time after a discharge occurs between the electrode and the workpiece by the switch.

A power supply device for an electric discharge machine according to a seventeenth aspect of the present invention is a power supply unit for supplying a current for machining, an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply unit, A current interrupting unit that is separated from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided with a current interrupting unit provided near the electrode or the workpiece. A diode bridge is connected to the switch, and a switch is connected between the connection points of the four bridge-connected diodes. The switch is an absolute value circuit for detecting a voltage between the electrode and the workpiece, and a voltage of the absolute value circuit. A differential circuit for detecting fluctuation, a comparator for comparing the output of the differential circuit with a predetermined threshold value, and after the occurrence of discharge between the electrode and the workpiece by the output of the comparator, After a predetermined time, it is an ON state the switch a predetermined time width.

A power supply device for an electric discharge machine according to claim 18, wherein a current supply section for supplying a current for machining, an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply section, A current intermittent portion separated from the current supply portion, connected to the current supply portion by a power supply line and a regenerative line, and provided with a current intermittent portion provided near the electrode or the workpiece; Having a plurality of MOSFETs connected in parallel between the workpieces and connected in series with a common source,
The plurality of MOSFETs include a differentiating circuit that detects a voltage variation between the electrode and the workpiece, a comparator that compares an output of the differentiating circuit with a predetermined threshold, and sets the switch to an electrode according to an output of the comparator. The switch is turned on for a predetermined time width after a predetermined time after the occurrence of discharge between the workpiece and the workpiece.

A power supply device for an electric discharge machine according to a nineteenth aspect of the present invention is a power supply unit for supplying a current for machining, and intermittently controls a machining current supplied between the electrode and the workpiece from the current supply unit. A current interrupting unit that is separated from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided with a current interrupting unit provided near the electrode or the workpiece. The switch is connected to the switch, and the switch controls the dischargeable time between the electrode and the workpiece at the timing controlled by the external control means. During the dischargeable time, the voltage between the electrode and the workpiece is controlled. A differentiating circuit for detecting fluctuation, a comparator for comparing an output of the differentiating circuit with a predetermined threshold, and after the occurrence of discharge between the electrode and the workpiece by the output of the comparator, After while, it is an ON state the switch a predetermined time width.

According to a twentieth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a current supply unit for supplying a current for machining, and a machining current supplied between the electrode and the workpiece from the current supply unit are intermittently controlled. A current interrupting unit provided separately from the current supply unit, connected to the current supply unit by a power supply line and a regenerative line, and provided near the electrode or the workpiece. A capacitor is connected between the regenerative wires on the unit side, a switch is connected between the power supply line between the electrode and the workpiece, a diode is connected between the power supply line and the regenerative wire, and the electrode and the workpiece are connected. A capacitor and a primary coil of a pulse transformer are connected in series between objects, and the switch is turned on by a voltage generated on a secondary side of the pulse transformer for a predetermined time immediately after the occurrence of discharge.

A power supply device for an electric discharge machine according to a twenty-first aspect of the present invention is a power supply device for supplying a current for machining, and an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply portion. A current intermittent portion that is separated from the current supply portion, connected to the current supply portion by a power supply line and a regenerative line, and provided with a current interrupting portion provided near the electrode or the workpiece; A switch is connected in series between the switch and the switch, the discharge start time and the dischargeable interval between the electrode and the workpiece are controlled at a timing controlled by external control means, and during the dischargeable interval, A multiplying circuit for detecting a discharge current and a discharge voltage between the electrode and the workpiece and multiplying the multiplied values, and an integrating circuit for integrating the multiplied output, wherein an output of the integrating circuit reaches a predetermined threshold. When the discharge is possible Regardless 隔中 is for opening the switch.

According to a twenty-second aspect of the present invention, a power supply device for an electric discharge machine includes a current supply unit for supplying a current for machining, an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply unit, A current intermittent portion separated from the current supply portion, connected to the current supply portion by a power supply line and a regenerative line, and provided with a current intermittent portion provided in the vicinity of the electrode or the workpiece. The switch is connected to the switch, and the switch controls the dischargeable time between the electrode and the workpiece at a timing controlled by the external control means. During the dischargeable time, the voltage between the electrode and the workpiece is controlled. A differentiating circuit for detecting fluctuation, a comparator for comparing an output of the differentiating circuit with a predetermined threshold, and after the discharge of the switch between the electrode and the workpiece by the output of the comparator, a predetermined After a short time, the switch is turned on for a predetermined time width, a discharge current and a discharge voltage between the electrode and the workpiece are detected, and a multiplication circuit for multiplying the discharge current and the discharge voltage and an integration for integrating the multiplied output are provided. A circuit, wherein when the output of the integration circuit reaches a predetermined threshold, the switch is turned on regardless of the dischargeable interval.

According to a twenty-third aspect of the present invention, there is provided a power supply device for an electric discharge machine for supplying machining electric power between an electrode immersed in a machining fluid and a workpiece, wherein the power source is provided between the electrode and the workpiece. A current interrupting unit that controls the current of the discharge to be performed, and a current supply unit that supplies processing power to the current interrupting unit, wherein the current interrupting unit includes a capacitor between the current interrupting unit and a regenerative wire on the current supply unit side. And two switches are connected in series and parallel between the power supply lines on the side of the current supply unit, and the electrode and the workpiece are connected in series via an inductance between the series connection points of the two switches. In addition, a capacitor is connected in parallel to the electrode and the workpiece, and a diode is connected between the power supply line and the regenerative line.

According to a twenty-fourth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein:
The constant is set to the resonance frequency of the switching frequency of the inductance connected in series between the series connection points of the two switches and the capacitor connected in parallel to the electrode and the workpiece.

A power supply device for an electric discharge machine according to a twenty-fifth aspect is a power supply device for an electric discharge machine which supplies machining electric power between an electrode immersed in a machining fluid and a workpiece. A current interrupting unit that controls the current of the discharge to be performed, and a current supply unit that supplies processing power to the current interrupting unit. And a diode is connected between the power supply line and the regenerative line, and two switches are connected in series / parallel between the power supply lines on the side of the current supply unit, and the two switches are connected in series. An impedance matching circuit for matching impedance on both sides is connected between the connection points and between the electrode and the workpiece.

[0047]

According to a first aspect of the present invention, a power supply device for an electric discharge machine includes: a current supply unit for supplying a machining current; and an intermittent control of a machining current supplied between the electrode and the workpiece from the current supply unit. A device in which a current interrupting portion is provided near an electrode and a workpiece in order to separate from the current supply portion and a current interrupting portion provided in the vicinity of the electrode or the workpiece and eliminate inductance of a power supply line. It is. In addition, the current interrupt part
Is reverse biased when is supplied between the electrode and the workpiece.
Only when the supply is turned off, the
Forward bias of the electromotive force generated by the
From the current interrupter through the diode
The power is regenerated at the same time.
In short, a simple circuit configuration is obtained.

According to a second aspect of the present invention, in the power supply device for an electric discharge machine, a current interrupting portion is separated from a power source and provided in an electrode feeding means in order to eliminate an inductance of a power supply line. Wiring distance was shortened.

In the power supply device for an electric discharge machine according to the third aspect of the present invention, a current interrupting portion is provided between the electrode or the electrode and the electrode feeding means, and the distance between the electrode and the workpiece is reduced from the current interrupting portion. .

In the power supply device for an electric discharge machine according to a fourth aspect of the present invention, a current interrupting portion is provided between the workpiece and the machining table to reduce the distance between the current interrupting portion and the electrode to the workpiece.

In the power supply device for an electric discharge machine according to the fifth aspect of the present invention, a current interrupting portion is attached to a machining table or a lower portion of the machining table to reduce a distance between the current interrupting portion and the electrode to the workpiece.

According to a sixth aspect of the present invention, there is provided a power supply device for an electric discharge machine, wherein a metal wire is used as the electrode, and the metal wire is supplied with electric power via a feeder to cut the workpiece into an arbitrary shape. In the electric discharge machine, a current interrupting portion is separated from a power supply and provided near the power supply and the workpiece in order to eliminate the inductance of the power supply line.

The current supply section of the power supply device for an electric discharge machine according to the present invention is constituted by a power supply, a switch, a diode and a resistor, and the current interrupting section is provided between the regenerative wires on the current supply section side. A capacitor is connected in parallel, a switch is connected in series to the power supply line on the current supply unit side and connected to the electrode or workpiece, and a diode is provided between the power supply line side of the switch and a regenerative line. Connected to enable high-speed opening and closing of switches.

The current supply unit of the power supply device for an electric discharge machine according to the invention of claim 8 comprises a power supply, a switch, a diode and a reactor, and the current interrupting unit is provided between the regenerative wires on the current supply unit side. A capacitor is connected in parallel, a switch is connected in series to the power supply line on the current supply unit side and connected to the electrode or workpiece, and a diode is connected between the power supply line side of the switch and a regenerative line, The switch can be opened and closed at high speed.

The current supply unit of the power supply device for an electric discharge machine according to the ninth aspect of the present invention comprises a power supply, a switch, a diode, and a resistor, and the current interrupting unit is provided between the regenerative wires on the current supply unit side. A capacitor is connected in parallel, a switch is connected in series to a common line of one of the power supply line and the regenerative line on the side of the current supply unit and connected to the electrode or workpiece, and the other is connected between the other power supply line and the regenerative line. Connected a diode to enable fast opening and closing of the switch.

The current supply unit of the power supply device for an electric discharge machine according to the tenth aspect of the present invention comprises a power supply, a switch, a diode, and a reactor, and the current interrupting unit is provided between the regeneration wires on the current supply unit side. Connect capacitors in parallel,
A switch is connected in series to a common line between the one power supply line and the regenerative line on the current supply unit side and connected to the electrode or the workpiece, and a diode is connected between the other power supply line and the regenerative line. The switch can be opened and closed at high speed.

According to the eleventh aspect of the present invention, the current supply unit of the power supply device for an electric discharge machine comprises a power supply, a switch, a diode, and a resistor, and the current interrupting unit is provided between the regenerative wires on the current supply unit side. A capacitor is connected in parallel, a pair of power supply lines on the side of the current supply unit are connected to a switch connected in parallel between the electrode for supplying current and the workpiece, and a power supply line and a regenerative line are connected. A diode was connected to the switch to enable fast opening and closing of the switch.

The current supply unit of the power supply device for an electric discharge machine according to the twelfth aspect of the present invention comprises a power supply, a switch, a diode, and a reactor, and the current interrupting unit is provided between the regenerative wires on the current supply unit side. Connect capacitors in parallel,
The electrodes and the workpiece and the switch are connected in parallel to the pair of power supply lines on the side of the current supply unit, and a diode is connected between the power supply line and the regenerative line to enable high-speed opening and closing of the switch. did.

A current supply section of the power supply device for an electric discharge machine according to the invention of claim 13 is constituted by a power supply, a switch, a diode, and a reactor, and the current interrupting section is provided with a capacitor between the regenerative wires on the current supply section side. Are connected in parallel, a first switch is connected in series to one of the power supply lines on the side of the current supply unit, and a second switch is connected in parallel to the first switch between the electrode and the workpiece. These were connected in series, and a diode was connected between the power supply line and the regenerative line to enable high-speed opening and closing of the switch.

A current supply unit of the power supply device for an electric discharge machine according to the invention of claim 14 comprises a power supply, a switch, a diode, and a reactor, and the current interrupting unit includes a capacitor between regeneration lines on the current supply unit side. Are connected in parallel, two switches are connected in series and parallel between the power supply lines on the current supply unit side, the electrode and the workpiece are connected in series between the series connection points of the two switches, and A diode is connected between the power supply line and the regenerative line to enable high-speed switching of the switch.

According to a fifteenth aspect of the present invention, the current supply section of the power supply device for an electric discharge machine comprises a power supply, a switch, a diode and a reactor, and four switches in which each of two switches is connected in series / parallel. Connecting between the series connection points of the two switches and the current interrupting unit with a power supply line;
The current interrupting unit is connected in parallel with a capacitor between the regenerative wires on the current supply unit side, a diode bridge is connected between the power supply lines on the current supply unit side, and between the connection points of the four bridge-connected diodes. A switch is connected, an electrode and a workpiece are connected between the power supply lines on the current supply unit side, and a diode is connected between the power supply line and the regenerative line, thereby enabling high-speed opening and closing of the switch. .

The electric current interrupting portion of the power supply device for an electric discharge machine according to the present invention has a switch connected in parallel between the electrode and the workpiece, and the switch comprises a voltage between the electrode and the workpiece. A differential circuit for detecting fluctuations, a comparator for comparing the output of the differential circuit with a predetermined threshold value, and after the discharge of the switch between the electrode and the workpiece by the output of the comparator, a predetermined By turning on the switch for a predetermined time width after time,
Suppresses peak current at the start of discharge.

In the power supply unit for an electric discharge machine according to the seventeenth aspect of the present invention, the current interrupting unit connects a diode bridge between power supply lines, and connects a switch between connection points of the bridge-connected four diodes. The switch has an absolute value circuit that detects a voltage between the electrode and the workpiece, a differentiating circuit that detects a voltage change of the absolute value circuit, and a comparator that compares an output of the differentiating circuit with a predetermined threshold. After the discharge of the switch between the electrode and the workpiece by the output of the comparator, after a predetermined time, by turning on the switch for a predetermined time width, the peak current at the start of the discharge Suppress.

In the power supply device for an electric discharge machine according to the eighteenth aspect of the present invention, a plurality of MOSFEs connected in parallel between the electrode and the workpiece and connected in series with a common source are provided.
T, the plurality of MOSFETs has a differentiating circuit for detecting a voltage variation between the electrode and the workpiece, and a comparator for comparing an output of the differentiating circuit with a predetermined threshold value. The plurality of MOSFETs
By turning on the plurality of MOSFETs for a predetermined time width after a predetermined time after a discharge occurs between the electrode and the workpiece, a peak current at the start of the discharge is suppressed.

In the power supply device for an electric discharge machine according to the nineteenth aspect, the current interrupting portion connects a switch between power supply lines,
The switch controls the dischargeable time between the electrode and the workpiece at a timing controlled by external control means, and during the dischargeable time, detects a voltage variation between the electrode and the workpiece. A comparator for comparing the output of the differentiating circuit with a predetermined threshold, and after a discharge occurs between the electrode and the workpiece by the output of the comparator, after a predetermined time, a predetermined time By turning on the switch for a time width, the peak current at the start of discharge is suppressed.

In the power supply unit for an electric discharge machine according to the twentieth aspect, the current interrupting unit connects a capacitor between the regenerative wires on the side of the current supply unit, and connects a switch between the power supply line between the electrode and the workpiece. Connected, a diode is connected between the power supply line and the regenerative line, a capacitor and a primary coil of a pulse transformer are connected in series between the electrode and the workpiece, and a voltage generated on a secondary side of the pulse transformer is connected. By turning on the switch for a predetermined time immediately after the occurrence of discharge,
Suppresses peak current at the start of discharge.

In the power supply unit for an electric discharge machine according to the twenty-first aspect of the present invention, the current interrupting portion connects a switch in series between the power supply line, the electrode and the workpiece, and the switch is controlled by an external control means. The discharge start time and the dischargeable interval between the electrode and the workpiece are controlled at the set timing, and during the dischargeable interval, the discharge current and the discharge voltage between the electrode and the workpiece are detected. A multiplying circuit for multiplying, and an integrating circuit for integrating the multiplied output, wherein the switch is opened regardless of the dischargeable interval when an output of the integrating circuit reaches a predetermined threshold value, Make the discharge energy of each shot constant. As a result, since the discharge energy is controlled at a constant rate, the machining finish can be improved.

The electric current interrupting part of the power supply device for an electric discharge machine according to the invention of claim 22 connects a switch between power supply lines,
The switch controls the dischargeable time between the electrode and the workpiece at a timing controlled by external control means, and during the dischargeable time, detects a voltage variation between the electrode and the workpiece. A comparator for comparing the output of the differentiating circuit with a predetermined threshold value, and the switch outputs the switch according to the output of the comparator for a predetermined time after a predetermined time has elapsed after the occurrence of discharge between the electrode and the workpiece. And a multiplying circuit for detecting a discharge current and a discharge voltage between the electrode and the workpiece, multiplying the detected current and the discharge voltage, and integrating the multiplied output. When the output of the circuit reaches a predetermined threshold value, the switch is turned on regardless of the dischargeable interval. It is intended to turn on the short switches immediately occur.

A capacitor is connected in parallel between the regenerative wires on the current supply unit side of the power supply device for an electric discharge machine according to the twenty-third invention, and two switches are directly connected between the power supply lines on the current supply unit side. Connect in parallel, connect the electrode and the workpiece in series between the series connection points of each of the two switches via an inductance, and connect a capacitor in parallel with the electrode and the workpiece, A diode was connected between the power supply line and the regenerative line to enable high-frequency electric discharge machining. Further, electric discharge machining can be performed at a high frequency, the machining speed is high, and the machining finish can be improved.

In the power supply device for an electric discharge machine according to the present invention, the inductor and the capacitor are connected in series resonance at a high frequency and connected to the electrode and the workpiece. The applied voltage can be increased.

According to a twenty-fifth aspect of the present invention, in the current interrupting portion of the power supply device for an electric discharge machine, a capacitor is connected in parallel between the regenerative wires on the side of the current supply portion, and a diode is connected between the power supply line and the regenerative wire. In addition, two switches are connected in series and parallel between the power supply lines on the side of the current supply unit, and between the series connection points of the two switches and between the electrode and the workpiece, Connects an impedance matching circuit that matches the impedance of the workpiece and efficiently transmits machining energy.

[0072]

Embodiments of the present invention will be described below.
Throughout, the same reference numerals and symbols as those of the conventional example and the embodiment indicate the same or corresponding components as those of the conventional example and the embodiment.

FIG. 1 shows a first embodiment of the present invention. FIG. 1 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 according to a first embodiment of the present invention are separated.

In the figure, reference numeral 101 denotes a current supply unit for supplying a machining current, and 102 denotes a current supply unit from the current supply unit 101 to the electrode 5.
And a machining intermittent portion provided between the electrode 5 and the workpiece 4, while intermittently controlling the machining current supplied between the workpiece 5 and the workpiece 4 by separating the current supply unit 101 from the current supply unit 101. The current supply unit 101 and the current intermittent unit 102
The regenerative line 100A, the power supply line 100B and the power supply line 100C are connected, and the processing power is supplied from the current supply unit 101 to the current intermittent unit 102 by the power supply line 100B and the power supply line 100C. The current interrupting unit 102 interrupts the processing current supplied from the current supply unit 101, and connects the predetermined processing current to the electrode 5 and the workpiece 4 by feeding lines 103A and 103B that are wired as short as possible. The current interrupting unit 102 is installed near the electrode 5 and the workpiece 4 so that the power supply lines 103A and 103B can be connected at a short distance. In addition, the power supply line 100 which also serves as the regenerative line 100A and the regenerative line
B or the power supply line 100 </ b> C supplies the power generated during the switching control of the current
It regenerates in

Therefore, a current supply unit 101 having a power supply unit for supplying a relatively large machining current is separated from a current interruption unit 102 for intermittently controlling the machining current by a switch. Since the power generated during the switching control is regenerated to the current supply unit 101, the current intermittent unit 102 is reduced in size,
Inductance included in the power supply lines 103A and 103B,
Capacitance is very small, and it can be compared electrically. Even if the frequency is high, it can be electrically neglected, and it is not affected by the inductance of the power supply line 100B and the power supply line 100C. The processing quality is good and high-speed processing can be performed.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch, and are separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. Current interrupting part 1 provided
02 and the current supply unit 101 to the current intermittent unit 10
7 and feeder lines 100B and 100C for supplying current to FIG.
The current interrupting part 102 shown in the following examples is processed with the electrode 5.
Reverse bias when supply between objects 4 and supply was refused
Time, the inductance of the feed lines 100B and 100C
1 as a forward bias for electromotive force generated
The regenerative wires 100A and 100C for regenerating electric power from the current intermittent unit 102 to the current supply unit 101 via the power supply line 05 are provided , and correspond to an embodiment of the present invention.

FIG. 2 shows a second embodiment of the present invention. FIG. 2 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 according to a second embodiment of the present invention are separated. In the figure, the current intermittent part 102 is directly attached to the electrode feeding means 6. Since the electrode feeding means 6 is normally located above the electrode 5 and is not immersed in the processing liquid 2, there is no need to take measures against liquid leakage or the like.
Since it is not necessary to maintain airtightness as a housing structure of the current interrupting unit 102, manufacturing is easy and manufacturing can be performed at low cost. Further, there is an effect that the power supply lines 103A and 103B can be connected at a short distance.

In this embodiment, the current interrupting portion 102 is directly attached to the electrode feeding means 6. However, in the case of practicing the present invention, a mode in which the current interrupting section 102 is attached near the electrode feeding means 6 can be adopted. . In this case, the same effect as the former is obtained. The operation of the power supply device for an electric discharge machine in which the current supply part 101 and the current supply part 102 where the current supply part 102 is attached to or near the electrode feeding means 6 is separated is shown in FIG.
Are the same as those shown in FIG. 1, and a duplicate description is omitted here.

This embodiment is a power supply device for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch. Current interrupting part 1 provided
02, wherein the current interrupting section 102 is attached to the structure of the electrode feeding means 6, and corresponds to an embodiment of the second aspect of the present invention.

FIG. 3 shows a third embodiment of the present invention. FIG. 3 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current intermittent unit 102 according to a third embodiment of the present invention are separated. In the figure, the current interrupting section 102 is provided between the electrode feeding means 6 and the electrode 5. Since this position is closest to the electrode 5 and the power supply line 103A can be connected at a short distance, the inductance and the capacitance are very small. Further, even if the electrode 5 moves, the position with respect to the current interrupting portion 102 does not change, so that the power supply line 103A can be easily wired. Further, a structure in which the electrode 5 is directly attached to the housing of the current interrupting unit 102 may be adopted. The operation of the power supply device for an electric discharge machine in which the current supply unit 101 and the current connection unit 102 provided with the current connection unit 102 between the electrode feeding means 6 and the electrode 5 are separated from each other as in the present embodiment is shown in FIG. 1 is the same as that shown in FIG.

This embodiment is a power supply unit for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch, and are separated from the current supply unit 101 to be close to the electrode 5 or the workpiece 4 Current intermittent part 1 provided
02, and a current intermittent portion 102 is attached between the electrode 5 or the electrode 5 and the electrode feeding means 6, which corresponds to an embodiment of the third aspect of the present invention.

FIG. 4 shows a fourth embodiment of the present invention. FIG. 4 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 according to a fourth embodiment of the present invention are separated. In the figure, in this embodiment, a housing is placed between the workpiece 4 and the processing table 3, specifically, a housing between the workpiece 4 and the processing table 3, and the current interrupting part 102 is placed in the housing. Accommodating. This position is closest to the workpiece 4, and the feeder 103A and feeder 1
03B can be connected over a short distance, and has the effect of being able to electrically ignore inductance and capacitance even if the frequency is high. Further, even if the workpiece 4 moves, the current interrupting section 10
2, the feed line 103B can be easily wired. Further, a structure in which the workpiece 4 is directly attached to the housing of the current interrupting unit 102 may be employed.

FIG. 1 shows the operation of the power supply device for an electric discharge machine in which the current supply unit 101 and the current interruption unit 102 provided between the workpiece 4 and the machining table 3 are separated. Since they are the same as those shown, duplicate description will be omitted here. This embodiment is a power supply device for an electric discharge machine that supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining, and a current supply unit 101 that supplies a machining current; A machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch, and a current separated from the current supply unit 101 and provided in the vicinity of the electrode 5 or the workpiece 4. A current interrupting portion 102 is provided between the workpiece 4 and the processing table 3 and corresponds to an embodiment of the present invention.

FIG. 5 shows a fifth embodiment of the present invention. FIG. 5 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 are separated according to a fifth embodiment of the present invention. In the figure, a current interrupting section 102 is provided in a machining table 3. This position is close to the workpiece 4 and has an effect that the power supply line 103B can be connected at a short distance. Further, even if the processing table 3 moves, the workpiece 4 is attached to the processing table 3, so that the position of the workpiece 4 with respect to the current interrupting section 102 does not change. Therefore, the power supply line 103B can be easily wired.

In this embodiment, the current interrupting portion 102 is provided in the machining table 3. However, when the present invention is implemented, the distance of the power supply line 103 A becomes slightly longer.
The current interrupting section 102 can be provided below the processing table 3. As described above, the operation of the power supply device for an electric discharge machine in which the current supply section 101 and the current interruption section 102 in which the current interruption section 102 is provided inside or below the machining table 3 is separated is the same as that shown in FIG. Therefore, duplicate description is omitted here.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine for performing machining by supplying machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch, and are separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. Current interrupting part 1 provided
02, and a current interrupting portion 102 is attached to the processing table 3 or a lower portion of the processing table 3, and corresponds to an embodiment of the invention of claim 5.

FIG. 6 shows a sixth embodiment of the present invention. FIG. 6 is an overall configuration diagram showing a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 are applied to a wire cut electric discharge machine according to a sixth embodiment of the present invention. In the figure, the output of the current interrupting unit 102 is
The power is supplied to the workpiece 4 by the power supply line 34 by the 3A and the power supply line 103B. The power supply 34 is connected to a wire 35 serving as an electrode, and a discharge is generated between the wire 35 and the workpiece 4 so that electrical discharge machining can be performed. In particular, the power supply lines 103A, 1
In 03B, since the current interrupting portion 102 is near, connection can be made at a short distance, and the inductance included in the connection is small, so that the machining current can be cut off at a high speed. The effect of being able to start up is obtained.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch, and are separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. Current interrupting part 1 provided
02, and in particular, the wire 35 is the electrode 5;
A wire-cut electric discharge machine for processing the workpiece 4 into an arbitrary shape by supplying power to the wire 35 via a power supply 34, and the power supply 34 for supplying the current and the workpiece 4
Is provided with a current interrupting portion 102 in the vicinity of.

FIG. 7 and FIG. 8 show a seventh embodiment of the present invention. Next, as a seventh embodiment of the present invention, the configuration and operation of the electric discharge machine will be described with an example of the most basic configuration. The above-described first to sixth embodiments also incorporate any of the following circuits.

FIG. 7 illustrates the operations of the current supply unit 101, the regenerative wires 100A, the power supply lines 100B and 100C, and the current interrupting unit 102 used in the power supply device for the electric discharge machine according to the seventh embodiment of the present invention. FIG. In the figure, a switch 11 electrically controlled for switching with respect to a voltage source 10 and a resistor 1 for limiting a machining current are shown.
2 and a current supply unit 101 composed of a diode 13
Supplies machining power to the current interrupting unit 102 located at a position separated by the regenerative line 100A and the power supply lines 100B and 100C. The regenerative line 100A, the power supply lines 100B, 100C
Each have inductances 14C, 14D, and 14E, use feeder lines 100B and 100C for supplying machining power, and use a regenerative line 100A and a feeder line 100C shared with the regenerative line for regeneration.

The current interrupting section 102 includes a switch 104 connected in series between the power supply line 100B and the electrode composed of the electrode 5 and the workpiece 4, a capacitor 106 connected in parallel between the regenerative wires 100A and 100C, and a regenerative Connected between the power supply line 100A and the power supply line 100B,
It is constituted by a diode 105 having the direction of 00A as a forward bias direction. The capacitor 106 is a regenerative wire 10
Since it is connected between 0A and 100C, it is always charged to the voltage of the voltage source 10. Therefore, even with the inductances 14C and 14E, the voltage of the capacitor 106 is always a steady value and stable. Power supply line 103
Since A and 103B are wired with a short distance, this inductance is very small. In other words, even if the frequency is high, it can be electrically ignored even if the frequency is high. Therefore, when the switch 104 is turned off, the machining current is immediately reduced. I do.

Next, the operation of the power supply device for an electric discharge machine according to the seventh embodiment will be described. FIG. 8 shows a seventh embodiment of the present invention.
4 is a timing chart of a power supply device for an electric discharge machine as an example of the present invention. First, when the switch 104 is turned on at the timing t11 in FIG. 8A, the voltage between the electrodes 5 and the workpiece 4 shown in FIG.
A voltage of 0 is applied. Thereafter, when a discharge occurs between the electrode 5 and the workpiece 4 at timing t13, a machining current shown in FIG. 8C flows. The rise of the machining current is determined by the resistance 12 and the inductance of the feed lines 100B and 100C. Inductance 14 of power supply lines 100B and 100C
D, 14E, switch 104 is at timing t
When turned off at 12, the machining current immediately decreases at timing t15. Therefore, the voltage between contacts shown in FIG. 8B sharply drops at the timing t15 when the machining current shown in FIG. 8C becomes zero. As a result, the machining current can be cut off at high speed. At the moment when the switch 104 is turned off, a back electromotive force is generated by the inductances 14D and 14E, and an overvoltage is generated in the inductances 14D and 14E. No overvoltage is applied to 104. The output voltage of the switch 104 is as shown in FIG.

As in the current interrupting section 102 of this embodiment,
The fact that it can be configured with a small number of parts makes it possible to reduce the size of the current interrupting section 102 and the weight thereof, and to make the current interrupting section 102
And the workpiece 4 can be installed in the vicinity. Further, as described above, the regenerative line 100A, the feeder lines 100B, 100B
Even if C becomes long, there is an excellent effect that the machining current can be cut off at high speed.

This embodiment is a current supply unit for supplying a machining current in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 104, separated from the current supply unit 101, and provided near the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the current supply unit 101. The current interrupting unit 102 includes a voltage source 10, a switch 11, a diode 13, and a resistor 12. A capacitor 106 is connected in parallel between the lines 100A and 100C, and a switch 11 is connected in series to the power supply lines 100B and 100C on the current supply unit 101 side to connect the electrodes 5 and 100C. Connected to the workpiece 4, the feeding cable 100B of the switch 11, 100C side and the regenerative line 100
A diode 105 is connected between A and 100C, and corresponds to an embodiment of the present invention.

An eighth embodiment of the present invention will be described with reference to FIGS.
Shown in FIG. 9 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 applied to an electric discharge machine according to an eighth embodiment of the present invention are separated. FIG. 9 shows an eighth embodiment in which the resistor 12 of the seventh embodiment is replaced by a reactor 120 and a switch 1
1, the current of the reactor 120 is controlled by the switching control. Specifically, the current of the reactor 120 is shunted or detected by a DC current sensor, and the ON / OFF control of the switch 11 is controlled by PWM control, current comparison control, or the like. The reactor 120 includes the regenerative line 100A and the inductances 14C, 1C of the feeder lines 100B, 100C.
The inductance is considerably larger than that of 4D and 14E.

A current supply unit 101 composed of a switch 11 electrically controlled by the voltage source 10 to be turned on / off, a reactor 120 whose processing current is controlled by the switch 11, and a diode 13 has a regenerative line 100A. ,
The power supply lines 100B and 100C are connected to the current intermittent unit 102 at a remote position. This regeneration line 100
A, the feeder lines 100B and 100C have inductances 14C, 14D and 14E, respectively. The processing power is supplied using the power supply lines 100B and 100C, and the regeneration for the voltage source 10 uses the power supply line 100C which also serves as the regenerative line 100A and the regenerative line. The current interrupting unit 102 is the feed line 1
00B, a switch 104 connected between the electrode 5 and the electrode composed of the workpiece 4, a capacitor 106 connected between the regenerative wire 100A and the feed line 100C also serving as a regenerative wire, and a switch 106 connected between the regenerative wire 100A and the feed line 100B. Diode 1
05. The capacitor 106 is a regenerative wire 10
Since it is connected between 0A and the regenerative line 100C, it is constantly charged to the voltage state of the voltage source 10. Therefore, even with the inductances 14C and 14E, the voltage of the capacitor 106 is stable. In addition, the power supply line 103
Since A and 103B are wired with a short distance, the inductance is very small, and when the switch 104 is turned off, the machining current decreases immediately.

Next, the operation of the power supply device for an electric discharge machine in which the current supply section 101 and the current interrupting section 102 applied to the electric discharge machine of the eighth embodiment are separated will be described. FIG. 10 shows a current supply unit 101, a regenerative line 100A, and a power supply line 100 used in a power supply device for an electric discharge machine as an eighth embodiment.
4 is a timing chart for explaining the operation of B, 100C and the current interrupting unit 102.

When the switch 104 is turned on at the timing t21 in FIG. 10A, as shown in FIG. 10B, the voltage between the electrode 5 and the workpiece 4 increases, and the voltage source 10
Voltage. The rise of this voltage at timing t23 rises sharply when the current of reactor 120 is flowing continuously. That is, since the inductance of the reactor 120 is relatively large, while the previous discharge current does not decrease through the diode 105, the current shown in FIG.
When the switch 104 is turned on at the timing t21 in (a), the voltage between the electrodes is backed up by the reactor 120 and rises sharply at the timing t23 in FIG. Thereafter, the timing t is set between the electrode 5 and the workpiece 4.
When a discharge occurs at 24, the machining current shown in FIG. The rise of the machining current i21 is shown in FIG.
As shown in (c), it is determined by the current flowing through the reactor 120 at that time. If a discharge occurs while the current of the reactor 120 continues to flow through the diode 105, the current rises sharply at the timing t26 shown in FIG. This can be started much faster by the backup of the reactor 120 than the start-up of the resistor 12 of the seventh embodiment using the resistor 12. The processing current i21 has a ripple due to the ON / OFF control of the switch 11.

Next, when the switch 104 is turned off at the timing t22 in FIG.
However, the machining current i21 immediately decreases at the timing t27 even if there is an inductance of the power supply lines 100B and 100C. Therefore, FIG.
The inter-electrode voltage of 0 (c) immediately decreases at the timing t25 when the machining current i21 becomes zero. Therefore, the inductances 14D, 1 of the reactor 120 and the feeder lines 100B, 100C are determined.
The processing current i21 can be cut off at high speed without being affected by 4E.

At the moment when the switch 104 is turned off, an overvoltage is generated by the reactor 120 and the inductances 14D and 14E. When the switch 104 is turned on when the current of the reactor 120 is sufficiently reduced, the processing current i22 is determined by the voltage of the voltage source 10, the discharge voltage, and the inductance of the reactor 120, as shown in FIG. It rises with the current rise rate. If the timing of only the machining current having a constant rising rate of the current and having a smooth rise is selected and used for electric discharge machining, an electric discharge machine with less consumption of the electrode 5 can be obtained.

The current interrupting section 120 in this embodiment is
It can be configured with a small number of parts, can be made small and lightweight,
The current interrupting unit 102, which is a feature of the power supply device for an electric discharge machine in which the current interrupting unit 101 and the current supplying unit 102 are separated, is connected to the electrode 5
And the workpiece 4 can be installed in the vicinity.

As described above, according to the present embodiment, even if the inductance of reactor 120 is relatively large, regenerative line 100A and feeder lines 100B, 100C
There is an excellent effect that the machining current can be controlled on and off at a high speed even if the length becomes long.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 104, separated from the current supply unit 101, and provided near the electrode 5 or the workpiece 4. The current supply unit 101 includes a voltage source 10, a switch 11, a diode 13, and a reactor 120. The current discontinuity unit 102 is connected to a regenerative circuit on the side of the current supply unit 101. A capacitor 106 is connected in parallel between the lines 100A and 100C,
A switch 104 is connected in series to the feed lines 100B and 100C on the first side and connected to the electrode 5 or the workpiece 4, and a diode is provided between the feed lines 100B and 100C of the switch 104 and the regenerative lines 100A and 100C. 105, and corresponds to an embodiment of the invention of claim 8.

FIG. 11 shows a ninth embodiment of the present invention.
FIG. 11 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 are applied to an electric discharge machine according to a ninth embodiment of the present invention. In this embodiment, the switch 104 of the seventh embodiment is provided on the workpiece 4 and the power supply line 100C side, and only the connection point of the switch 104 is different. Since this is the same as the seventh embodiment, the description is omitted, but the same effect is obtained.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which performs machining by supplying machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 104, separated from the current supply unit 101, and provided near the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the current supply unit 101. The current interrupting unit 102 includes a voltage source 10, a switch 11, a diode 13, and a resistor 12. A capacitor 106 is connected in parallel between the lines 100A and 100C, and a switch 1 is connected to a feed line 100C which is a common line with one of the regenerative lines on the current supply unit 101 side.
04 is connected in series to the electrode 5 or the workpiece 4, and a diode 105 is connected between the other power supply line 100B and the regenerative line 100A. .

FIG. 12 shows a tenth embodiment of the present invention. FIG. 12 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply section 101 and a current intermittent section 102 are applied to an electric discharge machine according to a tenth embodiment of the present invention. In this embodiment, the switch 104 of the eighth embodiment is connected to the work 4
Since the machining current and machining voltage between the electrodes are the same as in the eighth embodiment, except that the connection point of the switch 104 is different, the description thereof is omitted. It has the same effect.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine for performing machining by supplying machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4. 101, a cutting current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch 104, is separated from the current supply unit 101, and is close to the electrode 5 or the workpiece 4. The current supply unit 101 includes a voltage source 10, a switch 11, a diode 13, and a reactor 120. The current discontinuity unit 102 is connected to a regenerative circuit on the side of the current supply unit 101. A capacitor 106 is connected in parallel between the lines 100A and 100C,
A switch 104 is connected in series to a common line 10C between the one feed line on one side and the regenerative line to connect the electrode 5 or the work 4
And a diode 105 is connected between the other power supply line 100B and the regenerative line 100A.
Corresponds to an embodiment of the present invention.

FIG. 13 shows an eleventh embodiment of the present invention. FIG. 13 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 are applied to an electric discharge machine according to an eleventh embodiment of the present invention.

This embodiment is similar to the voltage source 10 of the seventh embodiment.
Although the direction of the current and the polarity of the voltage are opposite to those of the seventh embodiment, the same operation is performed, and the same effect is obtained. In particular, when performing such processing of negative polarity, it is used for finishing processing with a small processing current. In this example,
Given that the on / off control of the machining current can be performed at a high speed, it is possible to apply a short machining pulse to the gap at a small machining current, that is, the energy of a single pulse is small, In other words, there is an excellent effect that fine processing can be performed with good surface roughness.
In addition, the fact that the on / off control can be performed at high speed means that the next pulse after one pulse can be quickly turned on, and the number of discharges generated per unit time, that is, the repetitive pulse frequency can be increased. An excellent effect that the processing speed can be increased is also exhibited. The effect of this embodiment in which the polarity of the voltage source 10 is reversed is not limited to this embodiment, but is common to other embodiments.

A twelfth embodiment of the present invention is shown in FIGS. FIG. 14 shows a current supply unit 101 and a current interrupting unit 1 applied to an electric discharge machine according to a twelfth embodiment of the present invention.
FIG. 2 is a circuit diagram showing a power supply device for an electric discharge machine in which the power supply device 02 is separated.

The switch 140 of the current interrupting unit 102 of this embodiment is connected in parallel between the electrodes, that is, between the electrode 5 and the workpiece 4, and on / off controlled between them. A switch 11 electrically controlled by the voltage source 10 and a current supply unit 101 including a resistor 12 and a diode 13 for limiting a machining current are located at positions separated by a regenerative line 100A and power supply lines 100B and 100C. The machining power is supplied to the current intermittent section 102 located at the position shown in FIG. This regeneration line 100
A, the feeder lines 100B, 100C have inductances 14C, 14D, 14E, respectively. For supplying the processing power, the feeder lines 100B, 100C are also used as the regenerative line 100A and the regenerative line as a line for regenerating to the voltage source 10 side. The power supply line 100C is used. The current interrupting unit 102 is connected to the power supply line 10.
0B and the feeder 100C, that is, a switch 140 connected between the electrodes, a capacitor 106 connected between the regenerative wire 100A and the feeder 100C, and a diode 105 connected between the regenerative wire 100A and the feeder 100B. You. Since the capacitor 106 is connected between the regenerative line 100A and the power supply line 100C which also serves as the regenerative line, the capacitor 106 is always charged to the voltage of the voltage source 10. Therefore, even with the inductances 14C and 14E, the voltage of the capacitor 106 is stable. In addition, the power supply line 103
Since A and 103B are wired with a short distance, the inductance is very small. When the switch 140 is turned on, the machining voltage instantaneously becomes zero and the machining current decreases immediately.

Next, the operation of the power supply device for an electric discharge machine in which the current supply unit 101 and the current interrupting unit 102 applied to the electric discharge machine of the twelfth embodiment are separated will be described. FIG.
Is a current supply unit 101, a regenerative wire 100A,
6 is a timing chart for explaining operations of 00B, 100C and the current interrupting unit 102.

When the switch 140 is turned off at the timing t31 shown in FIG. 15A, the voltage between the electrodes shown in FIG. 15B rapidly rises at the timing t33, and the voltage source between the electrode 5 and the workpiece 6 is turned on. Apply a voltage of 10. This switch 140
Switch 11 is turned on before the power supply line 1 is turned off.
When a current is passed through 00B and 100C, FIG.
The steep rise of the voltage between the electrodes shown in FIG. Thereafter, when a discharge is generated between the electrode 5 and the workpiece 4 at the timing t34, a machining current shown in FIG. 15C flows. The rise of the machining current is determined by the resistance 12 and the inductance of the feed lines 100B and 100C. Even if there are inductances 14D and 14E of the feed lines 100B and 100C, the switch 140
15 is turned on at the timing t32, the voltage between the contacts shown in FIG. 15B is short-circuited by the switch 140, so that it instantaneously becomes zero at the timing t35, and the machining current immediately decreases at the timing t36. Therefore, there is an effect that the machining current can be cut off at high speed.

At the moment when the switch 140 is turned off, an overvoltage occurs in the inductances 14D and 14E, but the diode 105 conducts and the current flows through the capacitor 106.
, No overvoltage is applied to the switch 140. The current interrupting unit 102 of this embodiment can be configured with a small number of components, and can be reduced in size and weight. Moreover, the current interrupting portion 102 of this embodiment can be installed near the electrode 5 and the workpiece 4. In addition, even if the regenerative wire 100A and the feeder wires 100B and 100C become longer, the machining current rises at high speed and can be cut off.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a processing current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 140 and separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the current supply unit 101. The current interrupting unit 102 includes a voltage source 10, a switch 11, a diode 13, and a resistor 12. A capacitor 106 is connected in parallel between the wires 100A and 100C. The switch 140 is connected in parallel between 4 and wherein the inter-power supply line 100B and a regenerative line 100A is obtained by connecting a diode 105, corresponding to the embodiment of the invention of claim 11.

A thirteenth embodiment of the present invention is shown in FIGS. FIG. 16 shows a current supply unit 101 and a current interrupting unit 1 applied to an electric discharge machine according to a thirteenth embodiment of the present invention.
FIG. 2 is a circuit diagram showing a power supply device for an electric discharge machine in which the power supply device 02 is separated.

In this embodiment, the resistor 12 of the twelfth embodiment is used.
Is replaced by a reactor 120, and the current of the reactor 120 is controlled by the switching operation of the switch 11. Specifically, the current of the reactor 120 is shunted or detected by a DC current sensor,
The ON / OFF control of the switch 11 is performed by PWM control or current comparison control, and a predetermined current is supplied by switching-controlling the current of the reactor 120. The reactor 120 includes a regenerative line 100A,
B, inductances 14C, 14D of 100C,
The inductance becomes considerably larger than that of 14E.

A current supply section 101 composed of a switch 11 electrically controlled by the voltage source 10, a reactor 120 whose machining current is controlled by the switch 11, and a diode 13 includes a regenerative line 100, a feed line 100 B , 100C to supply power to the current interrupting unit 102 at a remote position. The regenerative line 100A and the feeder lines 100B and 100C have inductances 14C and
14D and 14E.
The regenerative line 100A and the feeder line 100C that also serves as the regenerative line are used as the lines for regenerating OB and 100C to the voltage source 10 side. The current interrupting unit 102 includes a switch 160 connected between the electrode 5 and the workpiece 4, a capacitor 106 connected between the regenerative wire 100A and the power supply line 100C functioning as a regenerative wire, and between the regenerative wire 100A and the power supply line 100B. Is connected to the diode 105. Since the capacitor 106 is connected between the regenerative wires 100A and 100C, the capacitor 106 is always charged to the voltage of the voltage source 10. Therefore, the voltage of the capacitor 106 is stable even with the inductances 14C and 14E. In addition, the power supply line 103
Since A and 103B are wired with a short distance, this inductance is very small, and when the switch 160 is turned on, the machining current decreases immediately.

FIG. 17 shows a current supply unit 101, a regenerative wire 100A, power supply lines 100B and 100C, and a current interrupting unit 1 used in a power supply device for an electric discharge machine as a thirteenth embodiment.
12 is a timing chart for explaining the operation of the second embodiment. When the switch 160 is turned on at the timing t shown in FIG.
When it is turned off at 41, the voltage between the electrodes in FIG. 17B rises sharply at the timing t43, and the voltage of the voltage source 10 is applied between the electrodes. The rise of the voltage at the timing t43 rises sharply when the current of the reactor 120 continues to flow. This is because the inductance of the reactor 120 is relatively large and the constant current control is performed by the current supply unit 101, so that the switch 16 is switched at the timing t41 shown in FIG.
When 0 is turned off, the voltage between the electrodes rises sharply at timing t43. Thereafter, when a discharge occurs between the poles at a timing t44, a machining current i41 rising at a timing t46 shown in FIG. 17C flows. As shown in timing t46 of FIG. 17C, the rising of the machining current causes the discharge current to rise sharply to the current flowing in the reactor 120 due to the current flowing in the reactor 120 at that time. This can be started up at a higher speed than the one using the resistor 12 of the twelfth embodiment. The processing current i41 has a ripple due to ON / OFF control of the switch 11 of the current supply unit 101.

Next, when the switch 160 is turned on at the timing t42, the inductance of the reactor 120 and the inductances 14D,
Even if there is 14E, the processing voltage is short-circuited by the switch 160 as at the timing t45 and sharply drops. The machining current i41 is also instantaneously reduced at the timing t47.
Therefore, reactors 120 and 100B, 100C
Current i41 regardless of the inductances 14D and 14E of
At high speed. At the moment when the switch 160 is turned off, an overvoltage is generated by the reactor 120 and the inductances 14D and 14E.

In particular, the current interrupting section 102 of this embodiment
It can be configured with a small number of parts, and can be reduced in size and weight.
According to this embodiment, the current interrupting portion 102 can be installed near the electrode 5 and the workpiece 4. Note that FIG.
(D) shows the current of the reactor 120, and its integral value is always controlled so that a constant current i42 flows. 100A, feed line 100
B and 100C have an excellent effect that the machining current can be turned on and off at a high speed even if the length becomes long.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine for performing machining by supplying machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4. A cutting current 101 and a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 104, separated from the current supply unit 101, and provided near the electrode 5 or the workpiece 4. The current supply unit 101 includes a voltage source 10, a switch 11, a diode 13, and a reactor 120. The current discontinuity unit 102 is connected to a regenerative circuit on the side of the current supply unit 101. A capacitor 106 is connected in parallel between the lines 100A and 100C,
The electrode 5 and the workpiece 4 and a switch 160 are connected in parallel to a pair of feeder lines 100B and 100C on one side, and a diode 105 is connected between the feeder line 100B and the regenerative line 100C. This corresponds to the embodiment of the twelfth aspect of the present invention.

FIG. 18 shows a fourteenth embodiment of the present invention. FIG. 18 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 applied to an electric discharge machine according to a fourteenth embodiment of the present invention are separated. In this embodiment, the switch 104 of the current interrupting unit 102 is the same as that shown in FIG. 9 as the eighth embodiment. The switch 160 is the same as that shown in FIG. 16 as the thirteenth embodiment. Thus, in this example,
A switch 104 is provided between the power supply line 100B and the electrode 5,
Further, a switch 160 is provided between the electrode 5 and the workpiece 4. Each switch 10
4. The operation of the switch 160 is the same as that of the eighth embodiment and the thirteenth embodiment, but the on / off control of the machining current can be reliably performed at high speed by the rise and cutoff of the machining current.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. 101 and a processing current supplied from the current supply unit 101 between the electrode 5 and the workpiece 4 by switches 104 and 1.
60 and the current supply unit 101
A current intermittent portion 102 provided near the electrode 5 or the workpiece 4 and separated from the current supply portion 101.
Is composed of a voltage source 10, a switch 11, a diode 13, and a reactor 120.
2 is a regenerative wire 100A, 10A on the current supply unit 101 side.
0C, a first switch 1 is connected to one of the power supply lines 100B on the current supply unit 101 side.
04 in series, and a second switch 16 between the electrode 5 and the workpiece 4 with respect to the first switch 104.
0 is connected in series, and a diode 105 is connected between the power supply line 100B and the regenerative line 100A. This corresponds to an embodiment of the present invention.

FIG. 19 shows a fifteenth embodiment of the present invention. FIG. 19 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 are applied to an electric discharge machine according to a fifteenth embodiment of the present invention. In this embodiment, the switches 191 and 19 of the current
2, 193 and 194 are four switches connected in a bridge. When the switches 191 and 194 are turned on, the electrode 5 is positive and the workpiece 4 has a negative polarity. When the switches 192 and 193 are turned on, the electrode 5 is negative and the workpiece 4 is freely selected to have a positive polarity. it can. When the polarity of the switches 191, 192, 193, and 194 is alternately changed, electric discharge machining using an alternating current can be performed. Then, the switch 191 and the switch 193 or the switch 1
If the switch 92 and the switch 194 are turned on at the same time, the electrode 4 and the workpiece 4 can be short-circuited. This is the first type shown in FIG.
The same operation as the third invention is performed.

When the switch 194 is turned on and the switch 191 is turned on / off, the eighth switch shown in FIG.
The same operation as that of the embodiment is performed. When the switch 192 is turned on and the switch 193 is controlled to be turned on / off, FIG.
In the eighth embodiment, the operation is the same as that in the case where the electrode 5 and the workpiece 4 are exchanged, that is, when the polarity of the voltage is reversed.
When the switch 194 is turned on and the switches 191 and 192 are on / off controlled, the same operation as in the fourteenth embodiment shown in FIG. 18 is performed. That is, the power supply device for an electric discharge machine in which the current supply unit 101 and the current intermittent unit 102 are separated according to the fifteenth embodiment is capable of performing electric discharge machining such as on / off control of current, switching of polarity, short circuit between electrodes, and AC output. There is an excellent effect that all operations required by the power supply of the machine can be performed.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine for performing machining by supplying machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4. 101 and a processing current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 to the switches 191-1.
In addition to the intermittent control by the
A current intermittent portion 102 provided near the electrode 5 or the workpiece 4 and separated from the current supply portion 101.
Is composed of a voltage source 10, a switch 11, a diode 13, and a reactor 120.
2 is a regenerative wire 100A, 10A on the current supply unit 101 side.
0C, a capacitor 106 is connected in parallel, two switches 191 to 194 are connected in series and parallel between the power supply lines 100B and 100C on the side of the current supply unit 102, and a series connection point of the two switches 191 to 194 is connected. The electrode 5 and the workpiece 4 are connected in series between each other, and the diode 105 is connected between the power supply line 100B and the regenerative line 100A.

FIG. 20 shows a sixteenth embodiment of the present invention. FIG. 20 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 are applied to an electric discharge machine according to a sixteenth embodiment of the present invention. In this embodiment, in particular, the switch 411 of the current interrupting unit 102
Are connected between the electrodes, that is, between the electrode 5 and the workpiece 4 by diodes 207, 208, 209, and 210 which are bridge-connected, and ON / OFF control is performed between the electrodes. Voltage source 10
Switch 11 that is electrically controlled to switch with respect to
And the current supply unit 10 constituted by the reactor 120
1 supplies processing power to the current interrupting portion 102 separated by the regenerative line 100A and the power supply lines 100F and 100G, and regenerates surplus power by the regenerative line 100H. The regenerative line 100A, the feeder lines 100F and 100G, and the regenerative line 1
00H is the inductance 14C, 14F, 1
4G, 14E, and as feed power 100F,
100G, regenerative wire 100 as regeneration to voltage source 10 side
A, 100H is used. The current interrupting unit 102 is the feed line 1
00F and the feeder 100G, that is, the switch 411 connected between the poles, the capacitor 106 connected between the regenerative wires 100A and 100H, the regenerative wire 100A, the feeder 100
It comprises a diode 205 connected between F, a feed line 100G, and a diode 206 connected between the regenerative line 100H. The condenser 106 is a regenerative wire 100A, 100H
Because it is connected between them, it is always charged to the voltage of the voltage source 10. Therefore, the inductances 14C, 14C
Even when E is present, the voltage of the capacitor 106 is stable. Since the power supply lines 103A and 103B are wired with a short distance, the inductance is very small. When the switch 411 is turned on, the machining voltage instantaneously becomes zero and the machining current decreases immediately. In the sixteenth embodiment, the electrode 5 and the workpiece 4 can be short-circuited even if the current supply section has an AC output. There is an effect that a power supply device for a processing machine can be configured.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied from the current supply unit 101 to the electrode 5 and the workpiece 4 are intermittently controlled by a switch 411 and separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. The current supply unit 101 is provided with four switches in which the voltage source 10, the switch 11, the diode 13, the reactor 120, and the two switches 201 to 204 are connected in series / parallel. The current interrupting unit 102 is connected between the series connection points of the two switches 201 to 204 and the current interrupting unit 102 via power supply lines 100F and 100G. , The current supply unit 101 side of the regenerative line 100A, a capacitor 106 connected in parallel between 100H, the current supply unit 101 side of the feed line 100F, 100
G, diode bridges 207 to 210 are connected, a switch 411 is connected between the connection points of the four bridge-connected diodes 207 to 210, and an electrode is connected between the power supply lines 100F and 100G on the current supply unit 101 side. 5 and the workpiece 4 are connected, and the power supply line 100F,
Diodes 205 and 206 are connected between 100G and the regenerative wires 100A and 100H, and correspond to an embodiment of the present invention.

A seventeenth embodiment of the present invention is shown in FIG. 21, FIG. 22, and FIG. FIG. 21 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 are applied to an electric discharge machine according to a seventeenth embodiment of the present invention. FIG. 22 is an explanatory diagram of an electric discharge machining phenomenon in a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 are applied to an electric discharge machine according to a seventeenth embodiment of the present invention. FIG. 23 is an explanatory diagram of the influence of stray capacitance on the electric discharge machining phenomenon in the seventeenth embodiment of the present invention.

In this embodiment, the switch 510 corresponding to the switch 160 of the fourteenth embodiment is a MOSFE.
A semiconductor element capable of high-speed switching such as T is used. A differentiating circuit 211 for detecting a voltage A-B between the electrode 5 and the workpiece 4 and outputting a change rate thereof, a setting unit 212 for determining an operation level, that is, a threshold value, and a comparator 213 for comparing the two. A delay circuit 216 for delaying the output of the comparator 213 for a predetermined time, a monostable multivibrator 214 for making the output of the delay circuit 216 a constant pulse width, and a switch 510 composed of a MOSFET using the output of the monostable multivibrator 214.
And a gate driver 215 for driving the gate driver 215.

Here, the electric discharge machining phenomenon will be described with reference to FIG. The space between the electrode 5 and the workpiece 4 is filled with a working fluid such as oil or water. Therefore, the electrode 5 and the workpiece 4
A capacitance 220 as a stray capacitance is distributed between the two. When a voltage is applied between the electrode 5 and the workpiece 4, the capacitance 220 is charged. Since the capacitance 220 increases as the area of the processed portion of the electrode 5 increases and as the discharge gap decreases, the energy charged in the capacitance 220 also increases. When the dielectric breakdown is caused by the voltage applied to the gap between the electrode 5 and the workpiece 4 by the electrode feeding means 6, a partial discharge is generated like a discharge 221 and the instantaneous discharge energy causes the discharge of the workpiece 4 to occur. Processing can be performed by melting and scattering the workpiece portion 222. In the electric discharge machining, this is repeated countlessly to process the workpiece 4 into the shape of the electrode 5. This discharge energy affects not only the workpiece 4 but also the electrode 5, and if the electrode portion 223 melts and scatters, it causes electrode consumption. The discharge energy is the energy stored in the capacitance 220 between the electrode 5 and the workpiece 4 and the current supply unit 10.
It is the sum of the energy directly supplied from 1.

Conventionally, the energy by the capacitance 220 as the stray capacitance increases as the area of the processed portion of the electrode 5 increases, so that the large electrode 5 is used to finish the large workpiece 4. It was difficult to do. That is, even if a small amount of energy is supplied from the current supply unit 101, when the energy stored in the capacitance 220 between the electrode 5 and the workpiece 4 is larger, the finer electric discharge machining is not possible. Can not. this is,
As shown in the stray capacitance current movement 224 and the stray capacitance current movement 225, when the discharge 221 occurs, the entire energy stored in those capacitances 220 concentrates on the discharge 221 and the surge current Due to flowing as.

In this embodiment, before the energy stored in the capacitance 220 becomes the discharge energy, the switch 510 short-circuits the electrode 5 and the workpiece 4, causing a surge current to flow through the discharge 221. And to obtain fine processing energy.

Next, this will be described with reference to FIG. At the moment when the discharge 221 occurs, the energy stored in the capacitance 220, which is the stray capacitance, tends to concentrate on the discharge 221. This discharge is a kind of arc discharge, and the discharge voltage is approximately 25%. It will be about a volt. At this time,
When the electrode 5 and the workpiece 4 are short-circuited by the high-speed switching operation of the switch 510 made of a MOSFET or the like, and the discharge voltage or less, the energy stored in the capacitance 220 flows to the switch 510 made of the MOSFET, 221 disappears. The time during which the energy stored in the capacitance 220 flows after the generation of the discharge 221 is determined by the capacitance 220 and the discharge resistance of the discharge 221. This time is so short that a fast detection circuit and a fast switch are required. In addition, it is possible to detect the occurrence of the discharge 221 by detecting when the voltage between the electrode 5 and the workpiece 4 drops sharply.

The operation of the switch 510 made up of a MOSFET is such that the voltage drop when the discharge 221 occurs is detected by the differentiating circuit 211 after the state changes from the ON state to the OFF state.
The differentiating circuit 211 may detect the change as an analog voltage, or may make a determination in a digital portion by analog-to-digital conversion. Also, the same function can be obtained by using a component that transmits instantaneous voltage fluctuation such as a pulse transformer. The differentiated voltage waveform is compared by the comparator 213 so that the detection level of the occurrence of discharge is adjusted by the predetermined threshold value setting unit 212.
Here, when a discharge occurs, the output of the differentiating circuit 211 detects the voltage drop at the moment when the discharge occurs, a signal is output from the comparator 213 according to the level of the setter 212, and the time delay of this signal is set by the delay circuit 216. , To the monostable multivibrator 214. The delay time of the delay circuit 216 is the time after which the discharge is interrupted after the occurrence of the discharge, and is for controlling the energy of the discharge. In particular, when the delay time of the delay circuit 216 is shortened or set close to zero, the surge current at the time of occurrence of discharge can be reduced. The pulse time output from the monostable multivibrator 214 is such that the switch 510 short-circuits between the electrode 5 and the workpiece 4 and the energy stored in the capacitance 220 is discharged when the switch 510 is turned on.
It is set to be longer than the time when 1 disappears. After the time of the pulse output from the monostable multivibrator 214 has passed,
Since the switch 510 is turned off, the voltage between the electrode 5 and the workpiece 4 rises, and a state of waiting for the next discharge occurs. At this time, since the discharge 221 has already disappeared, the discharge 221 is generated at a new place. In this way, although one discharge energy is very small, a repetitive discharge is generated at a very high frequency, so that there is an effect that a very fast finishing process can be performed. Furthermore, there is an excellent effect that finishing can be performed with fine discharge energy even in processing of a large area. In addition, since the discharge energy can be adjusted by the delay circuit 216, a finishing process with a desired surface roughness can be performed.

This was not possible with a device having a feed line inductance as in a conventional electric discharge machine, but as in the embodiment of the present invention, an electric discharge machine in which a current interrupting portion and a current supply portion are separated. It became possible for the first time with a power supply unit.
A capacitor is attached between the electrode 5 and the workpiece 4,
It is needless to say that the energy of the discharge according to the seventeenth embodiment can be controlled intentionally also in the case of performing the electric discharge machining utilizing the energy stored in the capacitor.

This embodiment is a current supply unit for supplying a machining current in a power supply device for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. 101, a cutting current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch 510, and is separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. The current interrupting unit 102 includes a switch 510 connected in parallel between the electrode 5 and the workpiece 4, and the switch 510 includes the electrode 5 and the workpiece 4. A differentiating circuit 211 for detecting a voltage fluctuation between
Comparator 21 for comparing the output of 11 with a predetermined threshold
3. The switch 510 is turned on for a predetermined time width after a predetermined time after the discharge between the electrode 5 and the workpiece 4 is generated by the output of the comparator 213. This corresponds to an embodiment of the invention of claim 16.

FIG. 24 shows an eighteenth embodiment of the present invention. FIG. 24 is a main part circuit diagram for controlling a switch 240 of a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 applied to an electric discharge machine according to an eighteenth embodiment of the present invention are separated.

Specifically, the switch 240 in this embodiment uses a semiconductor element such as a MOSFET that can perform high-speed switching. The AC processing current supplied from the current supply unit 101 is supplied to the electrode 5 and the workpiece 4 via the power supply lines 100F and 100G and the power supply lines 103A and 103B.
It is connected to the. Bridge-connected diode 20
At the connection point of 7, 208, 209, 210, MOSFET
Is connected. This MOSFET
Are applied with voltages of the same polarity. A differential circuit 211 that detects a voltage A-B between the electrode 5 and the workpiece 4 and always sets the voltage polarity in the same direction by an absolute value circuit 241 and outputs a change rate thereof, and sets an operation level by the threshold value. A setting unit 212 for determining, a comparator 213 for comparing the two, and the comparator 213
A delay circuit 216 for delaying the output signal of the
It comprises a monostable multivibrator 214 for making the output of the delay circuit 216 a fixed pulse width, and a gate driver 215 for driving a switch 240 with the output of the monostable multivibrator 214. The operation is the same as that of the seventeenth embodiment shown in FIG. 21 except that the inter-electrode voltage AB between the electrode 5 and the workpiece 4 is output to the differentiating circuit 211 with the voltage polarity in the same direction by the absolute value circuit 241. Is the same. In this way, the same effects as those of the seventeenth embodiment shown in FIG.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a processing current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 are intermittently controlled by a switch 240 and separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided between the power supply lines 100F and 100G.
10, a switch 240 is connected between the connection points of the four bridge-connected diodes 207 to 210,
The switch 240 includes an absolute value circuit 241 for detecting a voltage between the electrode 5 and the workpiece 4,
Circuit 211 for detecting the voltage fluctuation of the differential circuit 2
Comparator 21 for comparing the output of 11 with a predetermined threshold
And the switch 240 is turned on for a predetermined time width after a predetermined time after the discharge between the electrode 5 and the workpiece 4 is generated by the output of the comparator 213. This corresponds to the embodiment of the seventeenth aspect of the present invention.

FIG. 25 shows a nineteenth embodiment of the present invention. FIG. 25 shows switches 242 and 243 of a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 applied to an electric discharge machine according to a nineteenth embodiment of the present invention are separated.
FIG. 3 is a circuit diagram of a main part for controlling the operation of the first embodiment. The power supply device for an electric discharge machine in this embodiment is constituted by a bidirectional switch composed of switches 242 and 243 composed of two MOSFETs in which the switch 240 of the eighteenth embodiment is connected in series. This operation is the same as that of the eighteenth embodiment shown in FIG.

This embodiment is a power supply unit for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. 101 and a processing current supplied from the current supply unit 101 between the electrode 5 and the workpiece 4 by switches 242 and 2
43, and the current supply unit 101
And a current interrupting section 102 provided near the electrode 5 or the workpiece 4.
Are a plurality of MOSFETs 242, 24 connected in parallel between the electrode 5 and the workpiece 4 and connected in series with a common source.
3, and the plurality of MOSFETs 242 and 243
A differential circuit 211 for detecting a voltage change between the electrode 5 and the workpiece 4; and a comparator 213 for comparing an output of the differential circuit 211 with a predetermined threshold value.
243, a predetermined time after the discharge between the electrode 5 and the workpiece 4 occurs, the plurality of MOs are moved for a predetermined time width.
The SFETs 242 and 243 are turned on.
This corresponds to an embodiment of the invention of claim 18.

FIG. 26 and FIG. 27 show a twentieth embodiment of the present invention. FIG. 26 shows a current supply unit 101 and a current interrupting unit 1 applied to an electric discharge machine according to a twentieth embodiment of the present invention.
FIG. 2 is a circuit diagram of a power supply device for an electric discharge machine in which the power supply device 02 is separated.
This embodiment is different from the twelfth embodiment shown in FIG.
A part of the circuit of the power supply device for the electric discharge machine is constituted by the circuit of the seventeenth embodiment shown in FIG. 19, and the difference lies in the control circuit for controlling the switch 510. That is, the discharge start pulse input terminal 250 and the discharge stop pulse input terminal 25
1 is input to the flip-flop 252, and the inverted output 254 of the flip-flop 252 is output to the OR circuit 253. This OR circuit 253 is provided in the seventeenth embodiment (FIG.
It is inserted between the monostable multivibrator 214 and the gate driver 215 in 1). Further, the delay circuit 216 of the seventeenth embodiment in FIG. 21 can operate even if the minimum time is set or omitted in this embodiment.

Next, the operation of the power supply device for an electric discharge machine according to the twentieth embodiment will be described. FIG. 27 is a timing chart for explaining the operation of the power supply device for an electric discharge machine according to the twentieth embodiment. 27A, when the discharge start pulse 250 arrives at the timing t51 in FIG. 27A, the flip-flop 252 is set, and FIG.
At the timing t53 shown in FIG.
(LOW) ”. Next, as shown in FIG. 27D, the voltage between the electrodes 5 and the workpiece 4 is changed to the timing t.
It rises at 54, and a discharge occurs between the electrode 5 and the workpiece 4 at a timing t55, and the voltage between the electrodes thereafter indicates a discharge voltage.
When this discharge occurs, the monostable multivibrator 2
At 14, a fixed short-time pulse 260 shown in FIG. 27E is output at timing t56. This pulse is applied to the OR circuit 25
3 and the logical sum with the output of the flip-flop 252 is obtained.
Is driven.

Although not described in the twelfth embodiment shown in FIG. 15, a surge current due to the energy between the electrode 5 and the workpiece 4 flows as shown in FIG. In some cases, such as when the current i51 is used for finishing processing, the current i51 may have energy greater than the processing current. At the moment when the discharge occurs at timing t55, the surge current i51
Short-time pulse 2 output at timing t56 shown in (e)
According to 60, when the switch 510 is turned on from the OR circuit 253, the surge current i52 shown in FIG. 27G can be reduced.

This type of operation is described in the twelfth embodiment (FIG. 1).
4), the thirteenth embodiment (FIG. 16), the fourteenth embodiment (FIG. 18), and the sixteenth embodiment (FIG. 20).
When the embodiment of FIG. 26 (FIG. 26) is applied, for example, at the timing t34 shown in FIG. 15B when the discharge shown in FIG. 15 of the twelfth embodiment occurs, the machining current shown in FIG. At the moment of rising, the flow of charged energy between the electrode 5 and the workpiece 4 is reduced, and the surface roughness of the workpiece 4 is improved, thereby reducing the electrode consumption.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. 101, a cutting current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch 510, and is separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the power supply line 100B. The current interrupting unit 102 connects a switch 510 between the power supply lines 100B and 100C.
The switch 510 controls the dischargeable time between the electrode 5 and the workpiece 4 at a timing controlled by an external control means, and during the dischargeable time, the voltage fluctuation between the electrode 5 and the workpiece 4 And a comparator 213 for comparing the output of the differentiating circuit 211 with a predetermined threshold value. The output of the comparator 213 switches the switch 510 between the electrode 5 and the workpiece 4. After the occurrence of, the switch 510 is turned on for a predetermined time width after a predetermined time,
This corresponds to an embodiment of the nineteenth aspect of the present invention.

FIG. 28 shows a twenty-first embodiment of the present invention. FIG. 28 is a main part circuit diagram for controlling a switch 265 of a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 applied to an electric discharge machine according to a twenty-first embodiment of the present invention are separated.

The power supply device for an electric discharge machine according to this embodiment performs the operation of each of the above-described embodiments using the simplest circuit as the current interrupting unit 102. Next, this configuration and operation will be described. A capacitor 263 and a primary side of a pulse transformer 264 are connected in series between the electrode 5 and the workpiece 4, and a switch 26 that performs switching control on the secondary side is provided.
5. The capacitor 263 and the primary side of the pulse transformer 264 function as a differentiating circuit, and the pulse transformer 264 functions as a predetermined pulse generating circuit.
The switch 265 composed of the OSFET is driven. MOS
The switch 265 made of an FET is composed of the electrode 5 and the workpiece 4.
When the voltage drops sharply due to the discharge generated between the electrode 5 and the workpiece 4, the capacitor 263
Through the pulse transformer 264, a voltage corresponding to the voltage drop is applied to the gate of the MOSFET as the switch 265. When the gate threshold voltage of the MOSFET as the switch 265 is exceeded, the switch 265
Turns on to short-circuit the electrode 5 and the workpiece 4. This short-circuit causes the voltage to drop sharply further.
An ON signal is applied to the gate of.

Next, when the voltage between the electrode 5 and the workpiece 4 decreases, the voltage does not decrease any more.
Is turned off. Therefore, when the voltage rises next and discharge occurs again, the above operation is repeated. However, at the moment of turning off, the pulse transformer 264
Since an overvoltage occurs on the primary side of the switch, the diode 105 charges the capacitor 106 with the current caused by the overvoltage, and then supplies the current to the regenerative line 100A to prevent the overvoltage from being applied to the switch 265. In the twenty-first embodiment, although the current intermittent unit 102 operates alone,
It may be combined with any one of the above-mentioned embodiments. That is, this 21st
In the embodiment of the present invention, the current supply unit 101 and the current interrupting unit 102 are separated from each other, and the electrode 5 and the workpiece 5 are used as the current interrupting unit 102 of the power supply device for an electric discharge machine. There is an effect that it is suitable to be provided in the vicinity of the object 4.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. A cutting current 101 and a machining current supplied from the current supply unit 101 to the electrode 5 and the workpiece 4 are intermittently controlled by a switch 265 and separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the power supply unit 101. The current interrupting unit 102 connects a capacitor 106 between the regenerative wires 100A and 100C on the current supply unit 101 side to supply power between the electrode 5 and the workpiece 4. A switch 265 is connected between the electric wires 100B and 100C, a diode 105 is connected between the power supply line 100B and the regenerative line 100A, and a capacitor 263 is connected between the electrode 5 and the workpiece 4. 21. The switch according to claim 20, wherein a primary coil of the pulse transformer 264 is connected in series, and the switch 265 is turned on by a voltage generated on a secondary side of the pulse transformer 264 for a predetermined time width immediately after the discharge occurs. This corresponds to an example.

A twenty-second embodiment of the present invention is shown in FIGS. 29, 30 and 31. FIG. 29 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 are applied to an electric discharge machine according to a twenty-second embodiment of the present invention. FIG. 30 is a timing chart for explaining the operation of the power supply device for an electric discharge machine according to the twenty-second embodiment. FIG. 31 is an explanatory diagram showing a processing state for explaining the effect by comparing the result of processing by the constant control of the discharge energy with the conventional method. In particular, the circuit of this embodiment is a discharge energy control circuit for controlling the discharge energy in a single pulse to be constant.

First, the configuration and operation of this embodiment will be described. An inter-electrode voltage AB between the electrode 5 and the workpiece 4 as shown in FIG. 30C is input to the differentiating circuit 211 to detect a steep voltage drop. The differential output is compared with a set value of a setting unit 212 for setting a threshold value by a comparator 213, thereby detecting a moment when a discharge occurs. The signal output from the comparator 213 is used as the discharge signal 270 shown in FIG. Also, the voltage A-B between the electrode 5 and the workpiece 4
Is amplified to an appropriate voltage by an amplifier 272 and is input to a multiplier 273 together with a detection signal C of a current detector 297 for detecting a machining current C0, and the product of these is calculated. This product is the machining power at that time. The output 282 of the multiplier 273 is output to the analog switch 276. When the discharge start signal 250 is output at the timing t61 in FIG. 30A, the flip-flop 301 is set, the output Q of the flip-flop 301 becomes "H (HIGH)", and the gate driver 215
As a result, a gate signal 274 as shown in FIG. 30E is output, and the switch 284 made of a MOSFET is turned on. When the switch 284 made of this MOSFET is turned on, the voltage between the electrodes 5 and the workpiece 4 rises to the power supply voltage as shown in FIG. Power supply voltage is about 80
It is on the order of volts. After a while, when the discharge occurs at the timing t63, the voltage drops sharply to the discharge voltage. This discharge voltage is about 25 volts. From this moment, the machining current C0 flows and increases as shown in FIG. This machining current C0 is detected by the current detector 297,
3 is output.

On the other hand, at timing t63 in FIG.
A signal that detects that the voltage has dropped sharply is output from the comparator 213, and the flip-flop 271 is set. As shown in FIG.
H). Then, the analog switch 276 is turned on, and the integrated value inside the integrator 278, which had been reset until then, is released by the output of the inverter 277. That is, the integration operation is started. Integrator 2
Reference numeral 78 integrates the product of the voltage between the electrode 5 and the workpiece 4 and the machining current from the moment the discharge is turned on, that is, the machining power. This integrated output 279 is shown in FIG. When this reaches the set value TH70 of the energy level setter 280, the comparator 287 outputs a signal at a timing t64 as shown in FIG. This signal passes through the OR circuit 289 and the flip-flop 301
And the flip-flop 271 is reset. As a result, the switch 284 is turned off, and the processing current and the processing voltage are also reduced. Further, since the flip-flop 271 is reset, the analog switch 276 is turned off, and the integrated value in the integrator 278 is also reset. Then, when the next discharge start signal 250 arrives, the same discharge energy control is performed again.

However, when the generation of electric discharge at the timing t63 is delayed, the machining voltage decreases due to a short circuit, or the like, or the machining current does not reach a predetermined current limit, the integrator 278 is required until the discharge stop signal 251 arrives. The output may not reach the threshold 286 of the setter 280. In this case, when the discharge stop signal 251 is output, FIG.
At timing t62 shown in FIG.
And the flip-flop 271 is reset. Therefore, the voltage or signal of each part is as shown by the dotted lines in FIGS. 30 (c), (e) and (h). By doing so, it is possible to prevent the discharge in the abnormal state from continuing.

The result of processing by the constant control of the discharge energy is compared with the conventional method with reference to FIG. In the figure, 291, 292, and 293 in FIG.
1 shows a single machining hole in a machining surface machined by each of a single pulse of a conventional electric discharge machining. Here, since the processing energy of each single pulse is not equal, the size of the single processing hole on the processing surface is different. Therefore, the finish was discontinuous and the surface roughness was not good. FIG. 31 (b) shows the result of processing by this constant discharge energy control. Since 294, 295, and 296 in FIG. 31B have a constant processing energy, a single processing hole on the processing surface can be processed to have substantially the same size. As described above, by performing the electric discharge machining continuously with a constant machining energy, there is an effect that the finish can be uniform and the electric discharge machining with good surface roughness can be performed. This effect has a remarkable effect when the processing energy is very small and the hole on the processing surface is made as small as possible to perform a very good finish processing. This is because, if a large amount of discharge is generated with a large processing energy in the presence of many small holes on the processed surface, the holes due to this discharge will deteriorate the surface roughness of the processed surface. Further, this method of controlling the constant discharge energy can control a very short discharge time, and the same can be performed by a microcomputer or a DSP (digital signal processor) by software. There are excellent effects such as very high-speed control and ultra-fine processing.

This embodiment is a current supply unit for supplying a machining current in a power supply device for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 and performs electric discharge machining. 101 and a cutting current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch 284 and separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And the power supply lines 100B and 100C.
A switch 284 is connected in series between the electrode 5 and the workpiece 4, and the switch 284 controls the discharge start time and the discharge between the electrode 5 and the workpiece 4 at a timing controlled by an external control means. A possible interval is controlled, a discharge current and a discharge voltage between the electrode 5 and the workpiece 4 are detected during the dischargeable interval, a multiplication circuit 273 for multiplying the detected discharge current and a discharge voltage, and an integration circuit for integrating the multiplied output. The switch 284 is opened when the output of the integration circuit 278 reaches a predetermined threshold, regardless of the dischargeable interval, and corresponds to an embodiment of the twenty-first aspect of the present invention.

A twenty-third embodiment of the present invention is shown in FIGS. 32, 33 and 34. FIG. 32 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 are applied to an electric discharge machine according to a twenty-third embodiment of the present invention. FIG. 33 is a timing chart for explaining the operation of the power supply device for an electric discharge machine according to the twenty-third embodiment. FIG. 34 is an explanatory diagram showing a processing state for explaining the effect by comparing the result of processing by the constant control of the discharge energy with the conventional method.

First, the configuration and operation of this embodiment will be described. As shown in FIG. 33 (c), a gap voltage AB between the electrode 5 and the workpiece 4 is input to the differentiating circuit 211 and a steep voltage drop is detected. The differential output is compared with the set value of the setting device 212, that is, the threshold value, by the comparator 213, thereby detecting the moment when the discharge occurs. The flip-flop 271 is set using the signal output from the comparator 213 as the discharge signal 270 shown in FIG. Further, a gap voltage AB between the electrode 5 and the workpiece 4 is amplified to an appropriate voltage by an amplifier 272, and is output to a multiplier 2 together with a detection signal C of a current detector 297 for detecting a processing current C0.
73 and computes their product. This product is the machining power at that time. The output 282 of the multiplier 273 is output to the analog switch 276. Discharge start signal 25
When "0" is output at the timing t71 in FIG. 33 (a), the flip-flop 301 is set, the inverted output Q bar becomes "L", and the gate driver 215 causes
A gate signal 274 is output as shown in FIG.
The switch 510 made of an FET is turned off. This MO
When the switch 510 including the SFET is turned off, FIG.
As shown in (c), the voltage between the electrodes 5 and the workpiece 4 rises to the power supply voltage. The power supply voltage is about 80 volts. After a while, when the discharge occurs at the timing t73, the voltage drops sharply to the discharge voltage. This discharge voltage is about 25 volts. From this moment, the machining current C0 flows as shown in FIG. This machining current C0 is detected by the current detector 297 and
Output to 3.

When the signal output from the comparator 213 is output as the discharge signal 270 shown in FIG.
The monostable multivibrator 214 outputs a pulse 300 having a predetermined time width as shown in FIG. The pulse 300 output from the monostable multivibrator 214 passes through the OR circuit 302, and causes the gate driver 215 to instantaneously turn on the switch 510 composed of a MOSFET. This gate signal 274 is
This is shown at timing t74 in (e).

Therefore, the machining current in FIG.
Although not described in the twenty-second embodiment of FIG. 30, when a discharge occurs, as described in the twentieth embodiment shown in FIG. 26, the peak current i71 is reduced by the capacitance between the electrode 5 and the workpiece 4. Generated by the energy stored in This peak current i71 turns off the switch 510 instantaneously at the timing t74 in FIG. 33 (e), thereby short-circuiting the electrode 5 and the workpiece 4 and reducing the flow of the peak current i71. (D) As shown in FIG.
Value. Since the time during which the peak current i71 flows is very short, a high-speed switching element such as a MOSFET is required as the switch 510. Further, if the short-circuiting time is long, the generated discharge will disappear, so the time width of the pulse 300 output from the monostable multivibrator 214 must be determined in consideration of this.

On the other hand, the comparator 213 outputs a signal which detects that the voltage has dropped sharply at the timing t73 in FIG.
When 1 is set, the output Q becomes "H" as shown in FIG. As a result, the analog switch 276 is turned on, and the integrated value in the integrator 278, which has been reset until then, is released by the output of the inverter 277. The integrator 278 integrates the product of the voltage between the electrode 5 and the workpiece 4 and the machining current from the moment the discharge is turned on, that is, the machining power. This integrated output 279 is shown in FIG. This is the energy level setting device 2
When reaching the set value TH70 of 80, the comparator 287 outputs a signal at a timing t75 as shown in FIG. This signal passes through an OR circuit 289,
The flip-flops 301 and 271 are reset. As a result, the switch 510 made of a MOSFET is turned on, and the machining current and the machining voltage are sharply reduced. Further, since the flip-flop 271 is reset, the analog switch 276 is turned off, and the integrated value in the integrator 278 is also reset. Then, when the next discharge start signal 250 arrives, the same control of the discharge energy is performed again.

However, when the discharge generation at the timing t73 is delayed, the machining voltage is reduced due to a short circuit or the like, or the machining current does not reach the predetermined current, the integrator 278 is required until the discharge stop signal 251 arrives. May not reach the set value TH70 of the setting device 280 in some cases.
In this case, when the discharge stop signal 251 is output, that is, at the timing t72 in FIG. 33B, the flip-flops 301 and 271 are reset to stop discharging. Therefore, the voltage or signal of each part is as shown in FIG.
It becomes like the dotted line of 1 (c), (e) and (h). By doing so, it is possible to prevent the discharge in an abnormal state from continuing.

The result of processing by the constant control of the discharge energy is compared with the conventional method with reference to FIG. In the drawing, 321, 322, and 323 in FIG. 34A indicate single-shot holes in the processing surface processed by respective single pulses of the conventional electric discharge machining. Since a high current flows instantaneously due to the peak current i71 at the time of occurrence of discharge, FIG.
Deep processing is performed as in the processing hole 320 of (a), and single-shot processing holes 321, 322, and 323 are formed on the processing surface by processing energy supplied from a power supply. Further, since the processing energy of each single pulse is not equal, the single processing holes 321, 322 and 323 on the processing surface are different in the size. Therefore, the finish was discontinuous and the surface roughness was not good. FIG. 34 (b) shows the result of processing by the discharge energy constant control. The single processing holes 324, 325, and 326 on the processing surface have constant processing energy, and therefore, the single processing holes 324, 32 on the processing surface.
5,326 can be machined to the same size. In addition, as shown by the peak current i72 in FIG. 33 (d), by performing continuous machining with constant electric discharge machining energy, there is an effect that electric discharge machining with uniform finish and good surface roughness can be performed. This effect has a remarkable effect when the processing energy is very small and the hole on the processing surface is made as small as possible to perform a very good finish processing. This is because even if there is a large discharge in the machining energy even if there is a large number of holes in the small machining surface, the holes due to this discharge deteriorate the surface roughness of the machining surface, but according to the embodiment of the present invention This is because a difference in size does not occur in a single machining hole on a machining surface by continuously machining with constant electric discharge machining energy. Further, this method of controlling the constant discharge energy can control a very short discharge time, and the same can be performed by a microcomputer or a DSP (Digital Signal Processor) by software. In this case, very high-speed control can be performed, and excellent effects such as ultrafine processing can be achieved.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 and performs electric discharge machining. 101, a cutting current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled by a switch 510, and is separated from the current supply unit 101 so as to be close to the electrode 5 or the workpiece 4. And a current interrupting unit 102 provided in the power supply line 100B. The current interrupting unit 102 connects a switch 510 between the power supply lines 100B and 100C.
The switch 510 controls the dischargeable time between the electrode 5 and the workpiece 4 at a timing controlled by an external control means, and during the dischargeable time, the voltage fluctuation between the electrode 5 and the workpiece 4 And a comparator 213 for comparing the output of the differentiating circuit 211 with a predetermined threshold value. The output of the comparator 213 switches the switch 510 between the electrode 5 and the workpiece 4. After the occurrence, after a predetermined time, the switch 510 is turned on for a predetermined time width, a discharge current and a discharge voltage between the electrode 5 and the workpiece 4 are detected, and a multiplication circuit 273 for multiplying the detected discharge current and discharge voltage is provided. An integration circuit 278 for integrating the multiplied output, and when the output of the integration circuit 278 reaches a predetermined threshold, regardless of the dischargeable interval, the switch is provided. 510 is intended to be turned on, corresponds to the embodiment of the invention of claim 22.

A twenty-fourth embodiment of the present invention is shown in FIGS. 35, 36 and 37. FIG. 35 is a circuit diagram showing a power supply device for an electric discharge machine in which a current supply unit 101 and a current interrupting unit 102 applied to an electric discharge machine according to a twenty-fourth embodiment of the present invention are separated. FIG. 36 is a timing chart for explaining the operation of the power supply device for an electric discharge machine according to the twenty-fourth embodiment. FIG. 37 is an explanatory view showing a state processed by this embodiment.

The twenty-fourth embodiment is applied to another embodiment of the AC output electric discharge machining shown in FIG. 19 which is the fifteenth embodiment.
31, 332, 333 and 334 are used, an inductance 330 and a capacitor 335 are connected to this output, and the output is connected between the electrode 5 and the workpiece 4 by feeding lines 103 A and 103 B as short as possible. The capacitor 335 may be a capacitance between the electrode 5 and the workpiece 4. The inductance 330 and the capacitor 335 are connected to the switch 33.
1 and 334 and switches 332 and 333 are alternately switched so as to resonate with the output high-frequency voltage. Other configurations are the same as those of the fifteenth embodiment in FIG.

Next, this operation will be described. Current interrupter 1
02 switches 331 and 334 and switches 332 and 33
Reference numeral 3 denotes an on / off control that is alternately repeated, and the switching output thereof is set to an alternating current. The signal that has performed the switching operation between the timing t81 and the timing t82 is shown in FIG.
(A). Therefore, the output is a high frequency alternating current. The AC voltage and a high voltage when the inductance 330 and the capacitor 335 resonate in series are applied between the electrode 5 and the workpiece 4. This AC is inductance 3
Since the value of the capacitor 30 and the value of the capacitor 335 are relatively small values, the frequency becomes higher than 100 KHz. This frequency may be a very high frequency available for industrial use, such as 13.56 MHz. This is shown by the applied voltage e81 in FIG. Also, as shown in FIG.
The current flowing between the electrode 5 and the workpiece 4 flows a little like i81 due to the capacitance between the electrode 5 and the workpiece 4.
When a discharge occurs at a timing t83 in FIG. 36B, the voltage changes from a high voltage due to resonance to a discharge voltage e82 of about 25 volts, and as shown in the machining current in FIG. , A high-frequency current i82 determined by the current supplied by the current flows.

The electric discharge machining is performed by the high frequency current i82. Since the electric discharge is generated every half cycle of the high frequency, a very fine electric discharge is generated. In particular, since the capacitance between the electrode 5 and the workpiece 4 and the capacitor 335 connected in parallel with this end the high frequency half cycle before the current flows as the peak current, the peak current hardly flows. When the switches 331 and 333 are turned off and the switches 332 and 334 are turned on at the timing t82 in FIG. 36A, the switches 331 and 333 are turned on.
When the switches 332 and 334 are turned off, or when all the switches 331 to 334 are turned off, the discharge stops. By repeating these, electric discharge machining can be performed.

When electric discharge machining is performed at such a high frequency, a discharge form is formed in which minute electric discharges are gathered in the vicinity of the occurrence of electric discharge of the workpiece 4, and the fine electric discharge by the high frequency
As shown in FIG. 37, under a condition where the spread of the discharge during the generation time of a single discharge is appropriate, the processing hole 350 on the surface of the workpiece 4 can be processed into a flat shape, which is suitable for finishing. In addition, although the discharge is fine due to high frequency, the repetition frequency is very high, so that there is an effect that the processing speed is much higher than that of the conventional method.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine which supplies machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4 to perform electric discharge machining. 101 and a processing current supplied from the current supply unit 101 between the electrode 5 and the workpiece 4 by switches 331 to 331.
34, and the current supply unit 101
And a current interrupting section 102 provided near the electrode 5 or the workpiece 4.
Are the regenerative wires 100A, 100A on the current supply unit 101 side.
C, a capacitor 106 is connected in parallel, two switches 331 to 334 are connected in series and parallel between the power supply lines 100B and 100C on the current supply unit 101 side, and the two switches 331 to 334 are connected in series. The electrode 5 between connection points
And the workpiece 4 are connected in series via an inductance 330, a capacitor 335 is connected in parallel with the electrode 5 and the workpiece 4, and the power supply line 100B and the regenerative wire 1 are connected.
The diode 105 is connected between 00A,
This corresponds to an embodiment of the invention of claim 23.

In this embodiment, since a voltage increase at the time of series resonance can be expected, each of the two switches 331 to 33 connected in series and parallel between the power supply lines on the current supply unit 101 side is used.
4 and the inductance 330 connected in series between the series connection points of the two switches 331 to 334, and the capacitor 335 connected in parallel to the electrode 5 and the workpiece 4 cause the resonance of the switching frequency. This constant is set for the frequency, and corresponds to an embodiment of the invention.

A twenty-fifth embodiment of the present invention is shown in FIGS. FIG. 38 shows a current supply unit 101 and a current interrupting unit 1 applied to an electric discharge machine according to a twenty-fifth embodiment of the present invention.
FIG. 2 is a circuit diagram showing a power supply device for an electric discharge machine in which the power supply device 02 is separated. The twenty-fifth embodiment is another embodiment of the high frequency electric discharge machine according to the twenty-fourth embodiment shown in FIG.
33, 334, an impedance matching circuit 340 is connected to this output, and the feed line 10 as short as possible is used.
The electrode 5 and the workpiece 4 are connected by 3A and 103B. Impedance matching circuit 340
Are switches 331 and 334 and switches 332 and 333
Are alternately switched so as to resonate with the frequency of the output high-frequency voltage, so that the impedance of the high-frequency output matches the impedance of the discharge between the electrode 5 and the workpiece 4. doing.

FIGS. 39 (a) to 39 (c) show impedances used in a power supply device for an electric discharge machine in which a current supply section 101 and a current interrupting section 102 applied to an electric discharge machine according to a twenty-fifth embodiment are separated. It is an example of a matching circuit. In the figure, (a) is a T-type matching circuit, (b) is a π-type matching circuit, and (c) is a matching circuit using a transformer. By using the impedance matching circuit 340, high-frequency power can be efficiently converted into discharge power between the electrode 5 and the workpiece 4.

In this embodiment, a power supply unit for supplying a machining current is provided in a power supply device for an electric discharge machine for performing machining by supplying machining power between an electrode 5 immersed in a machining fluid 2 and a workpiece 4. 101 and a processing current supplied from the current supply unit 101 between the electrode 5 and the workpiece 4 by switches 331 to 331.
34, and the current supply unit 101
And a current interrupting section 102 provided near the electrode 5 or the workpiece 4.
Are the regenerative wires 100A, 100A on the current supply unit 101 side.
A capacitor 106 is connected in parallel between B and
A diode 105 is connected between the power supply line 00C and the regenerative line 100A, and two switches 331 to 334 are connected in series and parallel between the power supply lines on the current supply unit 101 side. Between the series connection points and the electrode 5
An impedance matching circuit 340 for matching the impedance on both sides is connected between the workpiece and the workpiece 4, which corresponds to an embodiment of the twenty-fifth aspect of the present invention.

A power supply device for an electric discharge machine which supplies machining power between the electrode 5 immersed in the machining fluid 2 and the workpiece 4 in the present invention and performs electric discharge machining is provided by a current supply section for supplying a machining current. 101, a machining current supplied between the electrode 5 and the workpiece 4 from the current supply unit 101 is intermittently controlled, separated from the current supply unit 101, and provided near the electrode 5 or the workpiece 4. It has the configuration of the current interrupting unit 102.

Here, a current supply unit 1 for supplying a processing current
01 has mainly been described as being formed by the switch 11 that is electrically switched and controlled, the resistor 12 or the reactor 120 for limiting the machining current, and the diode 13. The output of the current supply unit 101 may be a constant current source or a constant current pulse source. Further, in order to improve the roughness of the processed surface of the workpiece 4 and reduce the consumption of the electrodes, a pulse whose wave front rises sequentially may be used. At this time, the output of the current supply unit 101 that supplies the processing current is a step wave other than the rectangular wave. That is, the outputs of the current supply unit 101 that supplies the processing current include a DC constant current output, a rectangular wave current output in which the supply time of the processing current is set to the pulse width, and a special waveform output.

The current intermittent section 102 intermittently controls the machining current supplied between the electrode 5 and the workpiece 4 from the current supply section 101, and separates the machining current from the current supply section 101 to form the electrode 5 or the workpiece. 4 is provided in the vicinity. However, when the present invention is implemented, the present invention is not limited to the method of simply controlling the start and end of the machining current, and once the electric discharge machining current is applied, the machining current is sequentially increased. By reducing the processing energy at the start of electric discharge and sequentially increasing the processing energy, the processing surface roughness of the workpiece 4 can be improved, and electrode consumption can be reduced.
That is, the intermittent control of the machining current controls the start and end of the machining current, and also includes the machining current control during that time.

The switches constituting the current supply unit 101 and the current intermittent unit 102 in each of the above embodiments can be electrically or mechanically controlled from the outside and can be quickly opened and closed. Is performed. Further, the circuit can be a gate circuit such as an analog gate.

The seventeenth (FIG. 21) and eighteenth (FIG. 2)
4), 19th (FIG. 25), 20th (FIG. 26), 22nd
The control circuit described in the embodiment of FIG. 28 (23) (FIG. 32) uses a microcomputer or a DSP (Digital Signal Processor) and a memory, an AD converter, a DA converter, etc., and is digitally controlled by software. Even with this configuration, the same effects as those of the above embodiment can be obtained.

[0182]

As described above, the power supply device for an electric discharge machine according to the first aspect of the present invention provides a power supply unit for supplying a machining current to the power supply device for an electric discharge machine, and an electrode and a power supply from the current supply unit. The cutting current supplied between the workpieces is intermittently controlled, separated from the current supply unit, divided into a current interruption unit provided in the vicinity of the electrode or the workpiece, and the current interruption is performed from the current supply unit. A power supply line for supplying current to the part, and the current interrupting part supplies between the electrode and the workpiece
When the power supply is turned off,
Forward via of electromotive force generated by inductance
And a regenerative line for regenerating electric power from the current interrupting section to the current supply section via a diode serving as a source. Therefore, by separating the current interrupting portion from the current supply portion, the current interrupting portion is reduced in size and weight, and the current interrupting portion can be installed near the electrode and the workpiece. The inductance of the feeder line between the parts was almost eliminated, and high-speed control of the machining current became possible. Also, if the current interrupting part supplies between the electrode and the workpiece,
The reverse biased diode is
The electromotive force generated by the inductance of the feeder
Forward bias, and the current through that diode
The power is regenerated from the intermittent part to the current supply part.
This eliminates the need for controlling the generated voltage, which results in a simple circuit configuration.
Therefore, the cost is lower than that of the apparatus shown in the conventional example. Especially,
Excess power generated due to a transient phenomenon or the like generated during switching control in the current interrupting section can be regenerated to the power supply side of the current supply section, and the switching control of the current interrupting section can be speeded up accordingly. By this high-speed switching control, there is an effect that processing finish becomes uniform and surface roughness is improved.

A power supply device for an electric discharge machine according to a second aspect of the present invention is a power supply device for an electric discharge machine, wherein the current interrupting portion of the first aspect is attached to a structure of an electrode feeding means. The inductance of the feed line between them is almost eliminated, and high-speed machining current control is enabled. In addition to the effect of the first aspect, in particular, here, the potential side other than the ground side can be shortened, and the length can be made uniform.

A power supply device for an electric discharge machine according to a third aspect of the present invention is a power supply device for an electric discharge machine, wherein the current intermittent portion according to the first aspect is mounted between the electrode or the electrode and the electrode feeding means. Thus, the inductance of the feeder line between the parts is almost eliminated, and high-speed machining current control is enabled. The same effect as the second aspect is achieved.

A power supply device for an electric discharge machine according to a fourth aspect of the present invention is a power supply device for an electric discharge machine, wherein the current interrupting portion is mounted between the workpiece and the machining table. The inductance of the power supply line between the current interrupting portion and the current interrupting portion is almost eliminated, and high-speed machining current control is enabled.
In addition to the effects of the first aspect, in particular, the size of the current intermittent portion may be slightly increased, and means for coping with forced cooling may be employed, thereby increasing the degree of freedom in design. be able to.

A power supply device for an electric discharge machine according to a fifth aspect of the present invention is a power supply device for an electric discharge machine, wherein the current interrupting portion is attached to the machining table or a lower portion of the machining table. The feed line inductance between the current interrupting portion and the current interrupting portion is almost eliminated, and high-speed machining current control is enabled. An effect similar to that of the fourth aspect is obtained.

A power supply device for an electric discharge machine according to a sixth aspect of the present invention is a wire cut electric discharge machine for machining a workpiece into an arbitrary shape by supplying a metal wire as the electrode and supplying power to the metal wire via a feeder. When used as a processing machine, a current feeder for supplying the current and a current interrupter near the workpiece are attached, and the current interrupter is separated from the power supply to eliminate the inductance of the feeder line. It is provided near the object. Therefore, the effect of claim 1 is achieved.

According to a seventh aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect includes a power supply, a switch, a diode, and a resistor. Connect a capacitor in parallel between the lines,
A switch is connected in series to the power supply line on the side of the current supply unit and connected to the electrode or the workpiece, and a diode is connected between the power supply line side of the switch and a regenerative line. Therefore, in addition to the effect of the first aspect, the configuration can be simplified and the size can be reduced, and all the circuit elements do not have inductive and capacitive characteristics. In addition, surplus power generated by a transient phenomenon or the like generated during switching control in the current interrupting section can be regenerated to the power supply side of the current supply section by the diode, and accordingly, the switching control of the current interrupting section can be speeded up, There is an effect that processing finish becomes uniform and surface roughness is improved.

In a power supply device for an electric discharge machine according to an eighth aspect of the present invention, the current supply unit according to the first aspect is constituted by a power supply, a switch, a diode, and a reactor, and the current interrupting unit is connected to a regenerator on the side of the current supply unit. A capacitor is connected in parallel between the lines, a switch is connected in series to the power supply line on the side of the current supply unit and connected to the electrode or the workpiece, and a diode is provided between the power supply line side of the switch and a regenerative line. Are connected. Therefore, in addition to the effects of the first aspect, the configuration can be simplified and the size can be reduced, and the reactor can be started up much faster by the backup, and the intermittent operation by the switching control can be sped up. In addition, surplus power generated by a transient phenomenon or the like that occurs during switching control in the current interrupting section can be regenerated by the diode to the power supply side of the current supply section.
There is an effect that the switching control of the current interrupting portion can be performed at a high speed, the finish of processing is uniform, and the surface roughness is improved.

According to a ninth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect includes a power supply, a switch, a diode, and a resistor. Connect a capacitor in parallel between the lines,
A switch connected in series to the common line of one of the power supply line and the regenerative line on the side of the current supply unit and connected to the electrode or the workpiece, and a diode connected between the other power supply line and the regenerative line It is. Therefore, the effect of claim 7 is achieved.

According to a tenth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit of the first aspect includes a power supply, a switch, a diode, and a reactor. A capacitor is connected in parallel between the lines, a switch is connected in series to a common line of one of the power supply line and the regenerative line on the side of the current supply unit and connected to the electrode or the workpiece, and the other power supply line A diode is connected between the regenerative wires. Therefore, the effect of claim 8 is achieved.

In a power supply device for an electric discharge machine according to an eleventh aspect of the present invention, the current supply unit according to the first aspect comprises a power supply, a switch, a diode, and a resistor. Connect a capacitor in parallel between the lines,
A switch is connected in parallel between the electrode for supplying current and the workpiece to the pair of power supply lines on the current supply unit side. Therefore, in addition to the effect of claim 9, the switch is disposed between the electrode and the workpiece and is in a short-circuit state except when discharging is performed. The influence of the capacitance can be eliminated.

According to a twelfth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit of the first aspect includes a power supply, a switch, a diode, and a reactor. A capacitor is connected in parallel between the wires, the electrode and the workpiece and the switch are connected in parallel to the pair of power supply lines on the side of the current supply unit, and a diode is provided between the power supply line and the regenerative line. Connected. Therefore, in addition to the effect of the eleventh aspect, the backup of the reactor allows a much faster start-up, and the intermittent operation by the switching control can be sped up.

According to a thirteenth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect is constituted by a power supply, a switch, a diode, and a reactor, and the current interrupting unit is connected to the regenerative power supply unit. A capacitor is connected in parallel between the lines, a first switch is connected in series to one of the power supply lines on the side of the current supply unit, and a second switch is provided between the electrode and the workpiece with respect to the first switch. Switches connected in parallel are connected in series, and a diode is connected between the power supply line and the regenerative line. Therefore, in addition to the effect of the twelfth aspect, in particular, since the first switch can be disposed near the electrode and the workpiece, the switching operation can be further speeded up.

According to a fourteenth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect is constituted by a power supply, a switch, a diode, and a reactor, and the current interrupting unit is connected to the current supply unit. A capacitor is connected in parallel between the lines, two switches are connected in series and parallel between the power supply lines on the side of the current supply unit, and the electrode and the workpiece are connected in series between the series connection points of the two switches. A diode is connected between the power supply line and the regenerative line. Therefore, it is possible to arbitrarily set the manner of opening / closing control of the two switches in series and parallel, and it is possible to reliably perform the on / off control of the machining current at high speed by the rise and cutoff of the machining current. Accordingly, the effects of claims 8, 10, 12, and 13 can be achieved.

According to a fifteenth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect includes a power supply, a switch, a diode, and a reactor, and four switches in which each of two switches is connected in series / parallel. A power supply line connecting the series connection points of the two switches to each other and the current interrupting unit, and the current interrupting unit connects a capacitor in parallel between the regenerative wires on the current supply unit side; A diode bridge is connected between the power supply lines on the current supply unit side, a switch is connected between the connection points of the four diodes connected in a bridge, and an electrode and a workpiece are connected between the power supply lines on the current supply unit side. And a diode connected between the power supply line and the regenerative line. Therefore, in addition to the effects of the eighth, tenth, twelfth, and thirteenth aspects, the power supply switching control, the short circuit between the electrodes, All operations required by the power source of the electric discharge machine such as AC output can be performed.

According to a sixteenth aspect of the present invention, in the power supply device for an electric discharge machine, the current supply unit according to the first aspect has a switch connected in parallel between the electrode and the workpiece, and the switch is connected to the electrode and the workpiece. A differentiating circuit for detecting a voltage variation between objects, a comparator for comparing the output of the differentiating circuit with a predetermined threshold, and the output of the comparator causes the switch to discharge between the electrode and the workpiece. Then, the switch is turned on for a predetermined time width after a predetermined time, so that the switch is turned on.
2. In addition to the effects of claim 13, claim 14, and claim 15, even in an electrode having a large area, a minute electric discharge machining with a reduced peak current can be performed. , And an electric discharge machine with good machining performance can be obtained.

According to a seventeenth aspect of the present invention, in the power supply device for an electric discharge machine, the current interrupting portion connects a diode bridge between the power supply lines and a switch between connection points of the four bridge-connected diodes. Connected, the switch is an absolute value circuit for detecting a voltage between the electrode and the workpiece, a differential circuit for detecting a voltage change of the absolute value circuit, a comparator for comparing an output of the differential circuit with a predetermined threshold value After the discharge between the electrode and the workpiece by the output of the comparator due to the output of the comparator, after a predetermined time, the switch is turned on for a predetermined time width, In addition to the effect of claim 16, even if the polarity of the power source is any, even in an electrode having a large area, a minute electric discharge machining with a reduced peak current can be performed. It enables fine processing of a large area was coming impossible, good machining performance electric discharge machine is obtained.

In the power supply device for an electric discharge machine according to the present invention, a plurality of MOSFETs connected in series between the electrode and the workpiece and connected in series with a common source may be provided. Having said plurality of MOSFETs
Has a differentiating circuit for detecting a voltage change between the electrode and the workpiece, a comparator for comparing an output of the differentiating circuit with a predetermined threshold value, and outputs the plurality of MOSFETs to the electrode and the workpiece by an output of the comparator. Since the plurality of MOSFETs are turned on for a predetermined time width after a predetermined time after a discharge between the MOSFET and the object occurs, the same effect as that of the seventeenth aspect is achieved.

A power supply device for an electric discharge machine according to a nineteenth aspect of the present invention is the power supply device for an electric discharge machine according to the first aspect, wherein the current interrupting portion connects a switch between the power supply lines, and the switch is connected to the electrode at a timing controlled by external control means. Controlling the dischargeable time between the workpiece and the dischargeable time, during the dischargeable time, a differential circuit for detecting a voltage change between the electrode and the workpiece, and comparing an output of the differential circuit with a predetermined threshold value A comparator, and the switch is turned on for a predetermined time width after a predetermined time after the discharge between the electrode and the workpiece is generated by an output of the comparator. The same effects as the effects of the sixteenth and seventeenth aspects are achieved.

According to a twentieth aspect of the present invention, in the power supply device for an electric discharge machine, the current intermittent part according to the first aspect is configured such that a capacitor is connected between regenerative wires on the side of the current supply part, and a capacitor is connected between the electrode and the workpiece. A switch is connected between the power supply lines, a diode is connected between the power supply line and the regenerative line, and a capacitor and a primary coil of a pulse transformer are connected in series between the electrode and the workpiece. Since the switch is turned on by a predetermined time width immediately after the occurrence of discharge by a voltage generated on the next side, the switch has a simple circuit configuration, and
Inexpensively, the same effects as the effects of claims 16, 17 and 18 are achieved.

A power supply device for an electric discharge machine according to a twenty-first aspect of the present invention includes a switch connected in series between the power supply line, the electrode and the workpiece in the first aspect, wherein the switch is controlled by an external control means. Control the discharge start time and the dischargeable interval between the electrode and the workpiece at the given timing, during the dischargeable interval, detect the discharge current and the discharge voltage between the electrode and the workpiece, and detect it. A multiplying circuit for multiplying, and an integrating circuit for integrating the multiplied output, wherein the switch is opened when the output of the integrating circuit reaches a predetermined threshold regardless of the dischargeable interval. In addition to the effects of claim 1, by controlling the discharge energy to be constant, the energy of each discharge can be controlled to be constant, and the processing hole on the surface of the workpiece can be processed into a uniform shape,
As a result, there is an effect that an electric discharge machine having a uniform machined surface and a good surface roughness can be obtained.

A power supply device for an electric discharge machine according to a twenty-second aspect of the present invention, in the configuration of the twenty-first aspect, controls the dischargeable time between the electrode and the workpiece by the switch. A differential circuit for detecting a voltage change between the electrode and the workpiece, a comparator for comparing an output of the differential circuit with a predetermined threshold value, and the switch between the electrode and the workpiece by the output of the comparator; Since the switch is turned on for a predetermined time width after a predetermined time after the occurrence of the discharge during the period, the peak current can be reduced even in an electrode having a large area in addition to the effects of claims 1 and 21. A reduced micro-discharge machining is enabled, and a large-area micro-machining, which has been impossible in the past, becomes possible, and an electric discharge machine with good machining performance can be obtained. In addition, by controlling the discharge energy to a constant value, the energy of each discharge can be controlled to a constant value, and the holes on the surface of the workpiece can be machined into a uniform shape. And a good electric discharge machine.

According to a twenty-third aspect of the present invention, in the power supply unit for an electric discharge machine, in the current interrupting part, a capacitor is connected in parallel between the regenerative wires on the current supply part side, and the power supply on the current supply part side is provided. Two switches are connected in series and parallel between electric wires, the electrode and the workpiece are connected in series via an inductance between series connection points of the two switches, and the electrode and the workpiece are connected. Connect a capacitor in parallel to
A diode is connected between the power supply line and the regenerative line. Therefore, high frequency can be applied by two switches connected in series and parallel. By performing electric discharge machining with high frequency, a machining hole on the surface of a workpiece can be machined into a uniform shape, which is excellent in finishing. In addition, there is an effect that the processing speed is much faster than the conventional method.

A power supply device for an electric discharge machine according to a twenty-fourth aspect of the present invention provides a power supply device for an electric discharge machine, wherein the repetitive switching frequency of each of the two switches, the inductance connected in series between the series connection points of the two switches, and The capacitor connected in parallel to the electrode and the workpiece sets the constant to the resonance frequency of the switching frequency. Can be easily controlled.

According to a twenty-fifth aspect of the present invention, in the power supply device for an electric discharge machine according to the first aspect, the current intermittent part is connected in parallel with a capacitor between the regenerative wires on the side of the current supply part. A diode is connected between the lines, and two switches are connected in series and parallel between the power supply lines on the side of the current supply unit, respectively, between the series connection points of the two switches, the electrode, and the workpiece. And an impedance matching circuit for matching the impedance on both sides. Therefore, in addition to the effects of claims 22 and 23, the transmission efficiency of the discharge energy can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a third embodiment of the present invention.

FIG. 4 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a fourth embodiment of the present invention.

FIG. 5 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a fifth embodiment of the present invention.

FIG. 6 is an overall configuration diagram showing a power supply device for an electric discharge machine according to a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram showing a power supply device for an electric discharge machine according to a seventh embodiment of the present invention.

FIG. 8 is a timing chart showing the operation of the seventh embodiment shown in FIG.

FIG. 9 is a circuit diagram showing a power supply device for an electric discharge machine according to an eighth embodiment of the present invention.

FIG. 10 is a timing chart showing the operation of the eighth embodiment shown in FIG.

FIG. 11 is a circuit diagram showing a power supply device for an electric discharge machine according to a ninth embodiment of the present invention.

FIG. 12 is a circuit diagram showing a power supply device for an electric discharge machine according to a tenth embodiment of the present invention.

FIG. 13 is a circuit diagram showing a power supply device for an electric discharge machine according to an eleventh embodiment of the present invention.

FIG. 14 is a circuit diagram showing a power supply device for an electric discharge machine according to a twelfth embodiment of the present invention.

FIG. 15 is a timing chart showing the operation of the twelfth embodiment shown in FIG.

FIG. 16 is a circuit diagram showing a power supply device for an electric discharge machine according to a thirteenth embodiment of the present invention.

FIG. 17 is a timing chart showing the operation of the thirteenth embodiment shown in FIG.

FIG. 18 is a circuit diagram showing a power supply device for an electric discharge machine according to a fourteenth embodiment of the present invention.

FIG. 19 is a circuit diagram showing a power supply device for an electric discharge machine according to a fifteenth embodiment of the present invention.

FIG. 20 is a circuit diagram showing a power supply device for an electric discharge machine according to a sixteenth embodiment of the present invention.

FIG. 21 is a control circuit diagram showing a power supply device for an electric discharge machine according to a seventeenth embodiment of the present invention.

FIG. 22 is an explanatory diagram of an electric discharge machining phenomenon in a power supply device for an electric discharge machine according to a seventeenth embodiment of the present invention.

FIG. 23 is an explanatory diagram of the influence of stray capacitance on the electric discharge machining phenomenon of the seventeenth embodiment of the present invention.

FIG. 24 is a control circuit diagram showing a power supply device for an electric discharge machine according to an eighteenth embodiment of the present invention.

FIG. 25 is a control circuit diagram showing a power supply device for an electric discharge machine according to a nineteenth embodiment of the present invention.

FIG. 26 is a circuit diagram showing a power supply device for an electric discharge machine according to a twentieth embodiment of the present invention.

FIG. 27 is a timing chart showing the operation of the twentieth embodiment shown in FIG. 26;

FIG. 28 is a control circuit diagram showing a power supply device for an electric discharge machine according to a twenty-first embodiment of the present invention.

FIG. 29 is a control circuit diagram showing a power supply device for an electric discharge machine according to a twenty-second embodiment of the present invention.

FIG. 30 is a timing chart showing the operation of the twenty-second embodiment shown in FIG.

FIG. 31 is an explanatory view showing a machining state in which a result of machining by constant control of discharge energy of the twenty-second embodiment shown in FIG. 29 is compared with a conventional method.

FIG. 32 is a control circuit diagram showing a power supply device for an electric discharge machine according to a twenty-third embodiment of the present invention.

FIG. 33 is a timing chart showing the operation of the twenty-third embodiment shown in FIG. 32;

FIG. 34 is an explanatory diagram showing a machining state in which the result of machining by the constant control of the discharge energy of the twenty-third embodiment shown in FIG. 32 is compared with a conventional method.

FIG. 35 is a control circuit diagram showing a power supply device for an electric discharge machine according to a twenty-fourth embodiment of the present invention.

FIG. 36 is a timing chart showing the operation of the twenty-fourth embodiment shown in FIG.

FIG. 37 is an explanatory diagram showing a state in which processing is performed by discharge energy control in the twenty-fourth embodiment shown in FIG. 35;

FIG. 38 is a circuit diagram showing a power supply device for an electric discharge machine according to a twenty-fifth embodiment of the present invention.

FIGS. 39 (a) to 39 (c) are views showing the second example shown in FIG. 38;
FIG. 15 is a circuit diagram showing an example of an impedance matching circuit used in the power supply device for an electric discharge machine according to the fifth embodiment.

FIG. 40 is an overall configuration diagram showing an example of a conventional electric discharge machine.

FIG. 41 is a circuit diagram of a first example from a power supply used in a conventional electric discharge machine to an electrode and a workpiece.

FIG. 42 is a timing chart showing an operation according to the first conventional example shown in FIG. 41;

FIG. 43 is a circuit diagram of a second example from a power supply used in a conventional electric discharge machine to an electrode and a workpiece.

FIG. 44 is a circuit diagram of a third example from a power supply used in a conventional electric discharge machine to an electrode and a workpiece.

FIG. 45 is a circuit diagram of a fourth example from a power supply used in a conventional electric discharge machine to an electrode and a workpiece.

FIG. 46 is a circuit diagram of a fifth example from a power supply used in a conventional electric discharge machine to an electrode and a workpiece.

[Explanation of symbols]

 2 Working fluid 4 Workpiece 5 Electrode 6 Electrode sending means 10 Voltage source 11 Switch 12 Resistance 13 Diode 34 Power supply 35 Wire 101 Current supply unit 102 Current interrupting unit 105 Diode 106 Capacitor 104 Switch 100A, (100C) Regenerative wire 100B, 100C power supply line 103A, 103B power supply line 120 reactor 140, 160, 211 switch 191-194 switch 201-204 switch 205-210 diode 510 switch 211 differentiating circuit 213 comparator 214 monostable multivibrator 215 gate driver 216 delay circuit 331-334 switch 240, 242, 243 Switch 241 Absolute value circuit 263 Capacitor 264 Pulse transformer 265 Switch 330 Induct Nsu 335 capacitor 340 impedance matching circuit

Claims (25)

(57) [Claims] 1. A power supply device for an electric discharge machine, which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electrical discharge machining, and supplies a machining current between the electrode and the workpiece. a supply unit, as well as intermittently controlling the machining current supplied between the electrode and the workpiece from the current supply section, separated from the current supply section, and a discontinuous portion provided in the vicinity of the electrode or the workpiece, A power supply line for supplying a current from the current supply unit to the current interrupting unit, and when the current interrupting unit supplies the current between the electrode and the workpiece;
When the power supply is turned off due to reverse bias,
The forward bias of the electromotive force generated by the
A regenerative wire for regenerating electric power from the current interrupting section to the current supply section via a diode . 2. The power supply device for an electric discharge machine according to claim 1, wherein said current interrupting portion is attached to a structure of an electrode feeding means. 3. A power supply device for an electric discharge machine according to claim 1, wherein a current interrupting portion is provided between said electrode or said electrode and said electrode feeding means. 4. A power supply device for an electric discharge machine according to claim 1, wherein a current interrupting portion is mounted between said workpiece and said machining table. 5. An electric current interrupting part is attached to the processing table or a lower part of the processing table.
The power supply device for an electric discharge machine according to the above. 6. A wire-cut electric discharge machine, wherein a metal wire is used as the electrode, a power is supplied to the metal wire via a power supply, and the workpiece is processed into an arbitrary shape. 2. A power supply device for an electric discharge machine according to claim 1, wherein a current interrupting portion is mounted near the workpiece. 7. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit, wherein the current supply unit includes a power supply, a switch, a diode, and a resistor; A capacitor is connected in parallel between the regenerative wires on the current supply unit side, a switch is connected in series to the power supply line on the current supply unit side and connected to the electrode or workpiece, and the power supply of the switch is On the wire side Power supply device for an electrical discharge machine being characterized in that a diode is connected between the between the raw wire. 8. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit. The current supply unit includes a power supply, a switch, a diode, and a reactor. A capacitor is connected in parallel between the regenerative wires on the current supply unit side, a switch is connected in series to the power supply line on the current supply unit side and connected to the electrode or workpiece, and the power supply of the switch is Power supply device for an electrical discharge machine in between the side and regeneration line, characterized in that a diode is connected. 9. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit, wherein the current supply unit includes a power supply, a switch, a diode, and a resistor; A capacitor is connected in parallel between the regenerative wires on the side of the current supply unit, and a switch is connected in series on a common line between one of the power supply line and the regenerative line on the side of the current supply unit to connect the electrode or the workpiece. Connect to the other Power supply device for an electrical discharge machine is between regeneration line to the feed line, characterized in that a diode is connected. 10. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit. The current supply unit includes a power supply, a switch, a diode, and a reactor. A capacitor is connected in parallel between the regenerative wires on the side of the current supply unit, and a switch is connected in series on a common line between one of the power supply line and the regenerative line on the side of the current supply unit to connect the electrode or the workpiece. Connect to , For an electrical discharge machine power supply between the other feed line and the regenerative line, characterized in that a diode is connected. 11. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit, wherein the current supply unit includes a power supply, a switch, a diode, and a resistor; A capacitor connected in parallel between the regenerative wires on the current supply unit side, and a switch connected in parallel between the electrode supplying the current and the workpiece on a pair of power supply lines on the current supply unit side And connect
And a diode connected between the power supply line and the regenerative line. 12. A power supply device for an electric discharge machine which supplies electric power between a workpiece and an electrode immersed in a machining fluid to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit. A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit. The current supply unit includes a power supply, a switch, a diode, and a reactor. A capacitor is connected in parallel between the regenerative wires on the current supply unit side, the electrodes and the workpiece and a switch are connected in parallel on a pair of power supply lines on the current supply unit side, and Wire and turn Line power supply device for an electrical discharge machine being characterized in that a diode is connected in between. 13. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying a current to the power supply unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, wherein the current supply unit includes a power supply, a switch, a diode, and a reactor; A capacitor is connected in parallel between the regenerative wires on the current supply unit side, a first switch is connected in series to one power supply line on the current supply unit side, and the electrode is connected to the first switch. And received Those of the second switch connected in parallel are connected in series between the engineering product, and, for an electrical discharge machine power supply is between regeneration line and the feed line, characterized in that a diode is connected. 14. A power supply device for an electric discharge machine, which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying a current to the power supply unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, wherein the current supply unit includes a power supply, a switch, a diode, and a reactor; Connecting a capacitor in parallel between the regenerative wires on the side of the current supply unit, connecting two switches in series and parallel between the power supply lines on the side of the current supply unit, and connecting the series connection points of the two switches to each other. The electrode A workpiece connected in series, and, for an electrical discharge machine power supply is between regeneration line and the feed line, characterized in that a diode is connected. 15. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying a current to the power supply unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit. The current supply unit connects a power supply, a switch, a diode, a reactor, and two switches, The current interrupting unit is constituted by four switches connected in parallel, and connects between the series connection points of the two switches and the current interrupting unit with a power supply line. Conde between A diode bridge is connected between the power supply lines on the current supply unit side, a switch is connected between the connection points of the four diodes connected in a bridge, and a power supply line on the current supply unit side is connected. An electrode and a workpiece are connected to the power supply line, and a diode is connected between the power supply line and the regenerative line. 16. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying a current to the unit and a regenerative wire for regenerating power from the current interrupting unit to the current supplying unit, wherein the current interrupting unit has a switch connected in parallel between the electrode and the workpiece, The switch has a differentiating circuit that detects a voltage change between the electrode and the workpiece, and a comparator that compares an output of the differentiating circuit with a predetermined threshold value. Discharge was generated, power supply device for an electrical discharge machine, characterized in that said switch-on state for a predetermined time width after a predetermined time between. 17. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit, and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, wherein the current interrupting unit connects a diode bridge between the power supply lines and connects the bridge. A switch is connected between the connection points of the two diodes, the switch includes an absolute value circuit that detects a voltage between the electrode and the workpiece, a differential circuit that detects a voltage change of the absolute value circuit, and an output of the differential circuit. A comparator that compares the threshold value with a predetermined threshold value, and after a discharge occurs between the electrode and the workpiece by the output of the comparator, after a predetermined time, turns on the switch for a predetermined time width. A power supply device for an electric discharge machine, wherein the power supply device is in a state. 18. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying a current to the unit and a regenerative wire for regenerating power from the current interrupting unit to the current supplying unit, wherein the current interrupting unit is connected in parallel between the electrode and the workpiece,
A plurality of MOSFETs connected in series with a common source, wherein the plurality of MOSFETs compares a differential circuit that detects a voltage change between the electrode and the workpiece and an output of the differential circuit with a predetermined threshold value After a discharge occurs between the electrodes and the workpiece by the output of the comparator, the plurality of MOSFETs have a comparator, and after a predetermined time, the plurality of MOSFETs are turned on for a predetermined time width. A power supply device for an electrical discharge machine. 19. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, wherein the current interrupting unit connects a switch between the power supply lines, and the switch is an external control unit. The dischargeable time between the electrode and the workpiece is controlled at a controlled timing, and during the dischargeable time, a differential circuit that detects a voltage variation between the electrode and the workpiece, an output of the differential circuit And given And a comparator for comparing the value with a value.After a discharge occurs between the electrode and the workpiece by the output of the comparator, after a predetermined time, the switch is turned on for a predetermined time width. A power supply device for an electric discharge machine. 20. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit, wherein the current interrupting unit connects a capacitor between the regenerative wires on the current supply unit side, A switch is connected between the power supply line between the electrode and the workpiece, a diode is connected between the power supply line and the regenerative wire, and a capacitor and a primary coil of a pulse transformer are connected between the electrode and the workpiece. Connect in series and Power supply device for an electrical discharge machine for causing only on predetermined time width immediately after the discharge generating the switch by the voltage generated at the secondary side of the scan. 21. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, a switch connected in series between the power supply line, the electrode, and the workpiece, The switch controls the discharge start time and the dischargeable interval between the electrode and the workpiece at the timing controlled by the external control means.During the dischargeable interval, the discharge current and the discharge current between the electrode and the workpiece are controlled. The discharge voltage is detected and And a integrating circuit for integrating the multiplied output, wherein when the output of the integrating circuit reaches a predetermined threshold value, the switch is opened regardless of the dischargeable interval. A power supply device for an electric discharge machine. 22. A power supply device for an electric discharge machine which supplies machining power between an electrode immersed in a machining fluid and a workpiece to perform electric discharge machining, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative line for regenerating power from the current interrupting unit to the current supply unit, wherein the current interrupting unit connects a switch between the power supply lines, and the switch is an external control unit. The dischargeable time between the electrode and the workpiece is controlled at a controlled timing, and during the dischargeable time, a differential circuit that detects a voltage variation between the electrode and the workpiece, an output of the differential circuit And given And a comparator for comparing the value with a value.After a discharge occurs between the electrode and the workpiece by the output of the comparator, after a predetermined time, the switch is turned on for a predetermined time width; A multiplying circuit for detecting a discharge current and a discharge voltage between the electrode and the workpiece and multiplying the multiplied values, and an integrating circuit for integrating the multiplied output, wherein an output of the integrating circuit reaches a predetermined threshold. Wherein the switch is turned on irrespective of the dischargeable interval during the discharge. 23. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit. The current interrupting unit includes a capacitor connected in parallel between the regenerative wires on the current supply unit side Then, two switches are connected in series and parallel between the power supply lines on the current supply unit side, and the electrode and the workpiece are connected in series via an inductance between the series connection points of the two switches. And the electrode and the workpiece Connecting a capacitor in parallel, also, for an electrical discharge machine power supply is between regeneration line and the feed line, characterized in that a diode is connected. 24. The repetitive switching frequency of each of two switches connected in series and parallel between the power supply lines on the side of the current supply unit, the inductance and the electrode connected in series between the series connection points of each of the two switches. 24. The capacitor connected in parallel with the workpiece sets its constant to the resonance frequency of the switching frequency.
The power supply device for an electric discharge machine according to the above. 25. A power supply device for an electric discharge machine for performing electric discharge machining by supplying machining power between an electrode immersed in a machining fluid and a workpiece, a current supply unit for supplying a machining current, and the current supply unit A cutting current supplied between the electrode and the workpiece from the current supply unit, and a current interruption unit provided near the electrode or the workpiece and separated from the current supply unit; A power supply line for supplying current to the power supply unit and a regenerative wire for regenerating power from the current interrupting unit to the current supply unit. The current interrupting unit includes a capacitor connected in parallel between the regenerative wires on the current supply unit side A diode is connected between the power supply line and the regenerative line, and two switches are connected in series and parallel between the power supply lines on the side of the current supply unit. Between the electrode and the workpiece Power supply device for an electrical discharge machine, characterized in that the impedance connected to the impedance matching circuit for matching the.