CN102555272B - Servo drive system in press and Continuous maching system - Google Patents

Abstract

A kind of servo drive system of press, as the power source of drift (22), a pair servomotor (30a, 30b) using the torque based on mutual same speed-torque characteristic that required punch pressure can occur by synthesis is oppositely arranged on mutually the two ends of the action axle (20) that drift (22) is moved up and down, mutual specular is formed, by making this pair servomotor (30a, 30b) as body action Direct driver action axle (20).

Description

Servo drive system in press and Continuous maching system

The application be that on June 17th, 2003 submits to, application number is 03813989.8, denomination of invention is grandson's divisional application of " servo drive system in press and Continuous maching system ", sub-divisional application is submit on July 21st, 2009, application number is 200910151451.4, and denomination of invention is the application of " servo drive system in press and Continuous maching system ".

Technical field

The present invention relates to the servo drive system of the press such as used in turret punching-press, specifically, relate to the Continuous maching system of the press used in turret punching-press.

Background technology

Always, generally in stamping machine, the drive source as drift has the electrodynamic type drive source using servomotor.In the punch process of the press of such stamping machine etc., because great noise occurs work in-process, therefore wish to reduce this noise as far as possible.

In such punch process, the occurring principle of noise is very complicated, because of the material of workpiece, other various conditions of thickness of slab and different, but noise is little when when the drawing velocity due to drift is fast, noise is large, drawing velocity is slow, in addition, if drawing velocity is certain, when load is light, noise is little, and when load is heavy, noise is large, and these are known.

Above-mentioned prior art, open in No. 2001-62591, the JP and JP 2001-62596 publication of Japanese Unexamined Patent Publication.

But, existing electrodynamic type stamping machine, because such as use the mechanism such as connecting rod and flywheel that the torque of machining needs occurs, therefore because the inertia of this machinery becomes the reason making the reciprocating motion of drift slow down, in addition, outside this, main shaft and the action axle that drift is moved up and down of servomotor, driven by Poewr transmission mechanisms such as gears, the loss because this Poewr transmission mechanism causes or delay inevitably occur.Therefore, even if the actuating speed that the speed controlling servomotor follows drift is also very difficult, the speeds control for drift is not suitable for.

Thus, in the prior art, because the weight of tube load is not set as drawing velocity almost certain, if so drawing velocity is set low for reducing noise, then significantly operating efficiency can be reduced.On the other hand, from the requirement of operating efficiency drawing velocity set high, then can there is large noise.As a result, exist low noise and operating efficiency can not and the problem of depositing.

In addition, in existing system, in oil pressure stamping system, switch predetermined punching press pattern according to thickness of slab, material, attempt thus reduce noise and maintain drawing velocity and deposit.Need the complicated control system such as hard, soft of high speed processing for this reason.

On the other hand, generally, in stamping machine, the hydraulic type drive source using oil pressure and the drive source using servomotor is had as drift drive source.In addition, in stamping machine, such as step punching etc. is had to utilize same diel continuous punching workpiece to carry out processing, in the processing of such continuous punching, the high speed of plot drift.

But, existing hydraulic type stamping machine because be use oil pressure, use transfer valve drift is moved back and forth, therefore than electrical control bad response, unavoidably control instruction is delayed, therefore, is not suitable for the high speed of drift.

And then, because in above-mentioned prior art the weight of not tube load, drawing velocity is set as almost certain, if so low for drawing velocity setting, then significantly can reduce operating efficiency for reducing noise; On the other hand, from the requirement of operating efficiency drawing velocity set high, then can there is large noise, result, exist low noise and operating efficiency can not and the problem of depositing.

Therefore, try the mechanism of the unfavorable use of imagination such as connecting rod and flywheel etc., in addition also not by Poewr transmission mechanisms such as gears, use servomotor Direct driver to make the action axle of drift knee-action.So by using the Direct driver of such servomotor, automatically drawing velocity can be added and subtracted according to load, thus, can seek low noise and operating efficiency and deposit.

But, for there is the torque that machining needs, relatively use the occasion of the mechanism such as connecting rod and flywheel and do not use the occasion of (by servomotor Direct driver), in the punch process using stamping machine, because also need large punching press energy during punch process except increasing the kinergety of the high speed motion making drift move up and down, therefore need the servomotor of large rated capacity in the occasion of Direct driver.

So, for the action axle being made drift knee-action by such servomotor Direct driver, need to supply the electric energy of servomotor high speed motion and the electric energy of punching press, therefore unavoidably make the peak power of the control circuit of servomotor become very high.

Summary of the invention

The present invention is for solving the problem and proposing, its the first object is to provide a kind of servo drive system of press, described system can eliminate the problem that above-mentioned prior art has, do not use the Poewr transmission mechanisms such as the mechanism such as connecting rod and flywheel and gear, low noise is realized by automatically adding and subtracting drawing velocity according to load, and, can prevent from only deforming at the mechanical each several part being equivalent to action axle side, realize stable operation.

The second object of the present invention is to provide a kind of servo drive system of press, and described system can eliminate the problem that above-mentioned prior art has, by automatically adding and subtracting drawing velocity according to load, seek low noise and operating efficiency and deposit.

The third object of the present invention is to provide a kind of Continuous maching system of press, described system can eliminate the problem that above-mentioned prior art has, drive source as drift uses servomotor, and, by not using the Poewr transmission mechanisms such as the mechanism such as connecting rod and flywheel and gear, without the delay that driving force is transmitted in principle, also control lag does not occur, it is good and realize high speed to seek response thus.

The fourth object of the present invention is to provide a kind of servo drive system of stamping machine, described system can eliminate the problem that above-mentioned prior art has, by automatically adding and subtracting drawing velocity according to load, can seek low noise and operating efficiency and while depositing, reduce the peak power of the control circuit of servomotor.

For realizing above-mentioned first object, the servo drive system according to the press of the first aspect of the present application comprises: drift; Make the action axle that described drift moves up and down; And a pair servomotor, they are as the servomotor of the power source of described drift, use the torque based on mutual same speed-torque characteristic that the punch pressure needed can occur by synthesis, in such a configuration, above-mentioned a pair pair of servomotor is formed with specular mutually; Above-mentioned a pair pair of servomotor is oppositely arranged mutually at the two ends of described action axle; By making above-mentioned a pair servomotor as a body action, action axle described in above-mentioned a pair servomotor Direct driver, makes described drift move up and down.

According to the servo drive system of the press of the second aspect of the present application, in the servo drive system of described first aspect, by driving the power supply unit of servo amplifier of servomotor of a side of described a pair servomotor and the power supply unit of the servo amplifier of the servomotor of the opposing party to make described two servomotors as a body action by same gate signal.

According to the servo drive system of the press of the third aspect of the present application, in the servo drive system of described first aspect or second aspect, described a pair servomotor uses the torque based on the speed-torque characteristic of motor; Because do not utilize the inertia of mechanism that the punch pressure needed occurs, in the down maneuver of drift, be therefore subject to the load from workpiece, the speed according to this load two servomotor reduces.Thus, the decrease speed of described drift is made to reduce.

According to the servo drive system of the press of the fourth aspect of the present application, in the servo drive system in described first aspect to any one in the third aspect, the described action axle that described drift is moved up and down is made up of eccentric shaft; And described servomotor is formed using described eccentric shaft as motor main shaft.

According to the servo drive system of the press of the 5th aspect of the present application, in servo drive system in described first aspect to any one in fourth aspect, each rotor of described a pair servomotor, respectively hold around extension in the left and right of described eccentric shaft, setting-in along the circumferential direction equips the sleeve that even number is used as the magnet of magnetic pole at predetermined intervals on the outer periphery respectively; The position of magnetic pole (circumferential locations of magnetic pole magnet) of described left and right two sleeve is located with mutual specular, fixes respectively with lining; Each stator of described a pair servomotor, the urceolus of the exterior winding threephase armature coil of difference on described each rotor; Locate like that to become mutual specular in the circumferential locations of the threephase armature coil of left and right two urceolus, the support of the left and right of described eccentric shaft is fixed respectively.

According to the servo drive system of the above-mentioned the first to the five aspect, because use action axle described in a pair servomotor Direct driver of the punch pressure that necessity can occur to form like that, do not use the Poewr transmission mechanisms such as the mechanism such as connecting rod and flywheel and gear, so automatically drawing velocity can be added and subtracted according to load.

And then can low noise be realized, and can prevent from only deforming at the mechanical each several part being equivalent to action axle side, realize stable operation.

For realizing above-mentioned second object, according to the servo drive system of the press of the 6th aspect of the present application, in the press using servomotor as the power source of drift, as described servomotor, adopt: the torque using the speed-torque characteristic based on motor; Do not utilize the inertia of mechanism that the punch pressure needed can occur; When being subject to the load from workpiece in the down maneuver of drift, reduced the servomotor of the decrease speed of drift by the speed reducing motor according to this load.By described servomotor Direct driver, the action axle of drift knee-action is formed like that.

According to the servo drive system of the press of the 7th aspect of the present application, in the press using servomotor as the power source of drift, as described servomotor, employing is oppositely disposed mutually at the two ends of the action axle making drift knee-action, and synthesis uses the torque based on mutual same speed-torque characteristic; Do not utilize the inertia of mechanism that the punch pressure needed can occur, when being subject to the load from workpiece in the down maneuver of drift, reduced by a pair servomotor of the decrease speed of drift by the speed reducing motor according to this load.By making described a pair servomotor as a body action, described in Direct driver, action axle is formed like that.

According to the servo drive system of the press of the eighth aspect of the present application, in servo drive system in the described 6th or in the 7th, form the described action axle that drift is moved up and down with eccentric shaft, described servomotor is formed using described eccentric shaft as main shaft.

The servo drive system of eighth aspect is arrived according to the above-mentioned 6th, because when being subject to the load from workpiece in the down maneuver of drift, adopting the servomotor that the decrease speed of drift is reduced to carry out Direct driver makes the action axle of drift knee-action form like that, so automatically can add and subtract drawing velocity according to load.Thus, can realize low noise and operating efficiency and deposit.

For realizing above-mentioned 3rd object, according to the Continuous maching system of the press of the 9th aspect of the present application, in the press using servomotor as the power source of drift, as described servomotor, use the servomotor by using the torque based on the speed-torque characteristic of motor that the punch pressure needed can occur, Direct driver makes the action axle of drift knee-action form like that, drift leaves at the decline end position of the regulation required for punch process and the bottom of drift that returns from this position and moves up and down like that between the position above workpiece, by described servomotor, described action axle is only moved back and forth continuously in the angular range between this two positions being equivalent to drift, carry out continuous print punch process to workpiece thus to form like this.

According to the Continuous maching system of the press of the tenth aspect of the present application, in the press using servomotor as the power source of drift, as described servomotor, that the two ends being used in the action axle of drift knee-action are oppositely arranged mutually and used a pair servomotor that the punch pressure needed can occur based on the torque of mutual same speed-torque characteristic by synthesis, Direct driver makes the action axle of drift knee-action form like that, drift leaves at the decline end position of the regulation required for punch process and the bottom of drift that returns from this position and moves up and down like that between the position above workpiece, by described a pair servomotor, described action axle is only moved back and forth continuously in the angular range between this two positions being equivalent to drift, carry out continuous print punch process to workpiece thus to form like this.

According to the Continuous maching system of the press of the 11 aspect of the present application, in Continuous maching system in the described 9th or in the tenth, described servomotor be use based on the speed-torque characteristic of motor torque, do not utilize the inertia of mechanism that the servomotor of punch pressure needed can occur.

According to the Continuous maching system of the press of the 12 aspect of the present application, in Continuous maching system in the described 9th or in the tenth, form the described action axle that drift is moved up and down with eccentric shaft, described servomotor is formed using described eccentric shaft as main shaft.

According to the above-mentioned nine to the ten two aspect Continuous maching system, because make action axle only move back and forth continuously, carry out Continuous maching to workpiece and form like that being equivalent to the angular range between the described two positions of drift by using servomotor, so the Poewr transmission mechanisms such as the mechanism such as connecting rod and flywheel and gear can not be used, the action axle making drift move up and down by servomotor Direct driver.Therefore, to can be implemented in principle without the transmission delay of driving force, the good high speed of control lag, therefore response does not occur.

For realizing above-mentioned 4th object, according to the servo drive system of the press of the 13 aspect of the present application, in the stamping machine using servomotor as the power source of drift, as described servomotor, use can there is the servomotor of the punch pressure needed by using based on the torque of the speed-torque characteristic of motor, Direct driver makes the action axle of drift knee-action form like that.At the leading portion of the control analog line driver of described servomotor, be arranged through cut-off high-frequency current component and suppress the reactor of peak point current and supply owing to suppressing the capacitor of the electric energy of its peak point current and deficiency.

According to the servo drive system of the press of the fourteenth aspect of the present application, in servo drive system in the described 13, described capacitor is the servo drive system of supply owing to suppressing described peak point current and the electric energy of high speed motion of deficiency and/or the stamping machine of the electric energy of punching press.

According to the servo drive system of above-mentioned 13 and 14 aspects, be arranged through cut-off high-frequency current component by the leading portion of the control analog line driver at servomotor and suppress the reactor of electric current and supply owing to suppressing the structure of the capacitor of the electric energy of its peak point current and deficiency, automatically can add and subtract drawing velocity according to load, low noise and operating efficiency can be realized further and deposit.Therefore, the power of servomotor control circuit can be reduced.

Accompanying drawing explanation

Fig. 1 is the skiagraph of the important part of an embodiment of the servo drive system (Continuous maching system) represented according to press of the present invention.

Fig. 2 is the right hand view representing important part shown in Fig. 1.

Fig. 3 is the wiring diagram representing the servomotor of Fig. 1 and the structure example of its servo amplifier of driving.

Fig. 4 A, Fig. 4 B, Fig. 4 C are the key diagrams of the operating space of the eccentric axial portion (drift) representing eccentric shaft.

Fig. 5 is the figure of the example of the speed-torque characteristic representing servomotor.

Fig. 6 is the figure of the measured data indicated without punch process during workpiece.

Fig. 7 A represents that the feature based on the measured data of Fig. 6 extracts the figure of Wave data out.

Fig. 7 B is the figure of the punching press torque speed characteristic of the measured data represented based on Fig. 6.

Fig. 8 represents the figure with the measured data of punch process during minor diameter punching drawing quality steel sheet workpiece.

Fig. 9 A represents that the feature based on the measured data of Fig. 8 extracts the figure of Wave data out.

Fig. 9 B is the figure of the punching press torque speed characteristic of the measured data represented based on Fig. 8.

Figure 10 represents the figure with the measured data of punch process during major diameter punching drawing quality steel sheet workpiece.

Figure 11 A represents that the feature based on the measured data of Figure 10 extracts the figure of Wave data out.

Figure 11 B is the figure of the punching press torque speed characteristic of the measured data represented based on Figure 10.

Figure 12 represents the figure with the measured data of punch process during minor diameter punching punching press slab workpiece.

Figure 13 A represents that the feature based on the measured data of Figure 12 extracts the figure of Wave data out.

Figure 13 B is the figure of the punching press torque speed characteristic of the measured data represented based on Figure 12.

Figure 14 is the skiagraph of the important part of another embodiment of the servo drive system (Continuous maching system) represented according to press of the present invention.

Figure 15 is the right hand view representing important part shown in Figure 14.

Figure 16 is the wiring diagram representing the servomotor of Figure 14 and the structure example of its servo amplifier of driving.

Detailed description of the invention

With reference to the accompanying drawings embodiments of the invention are described.

Fig. 1 is the skiagraph of the important part of an embodiment of the servo drive system (Continuous maching system) represented according to press of the present invention, Fig. 2 is its right hand view, and the servo drive system (Continuous maching system) 1 of this press uses in turret punching-press 10.

Turret punching-press 10, on bearing portion 12a, 12b that support 11a, 11b that erected parallel is arranged are arranged, axle supports eccentric shaft 20.On the eccentric axial portion 20e of the eccentric shaft 20 of substantial middle between support 11a, 11b, by connecting rod 21, drift 22 is installed, by rotation or the rotation of eccentric shaft 20, by connecting rod 21, drift 22 is moved up and down along ram conduit 23, the striker 24 installed in drift 22 lower end also integrally moves up and down with drift 22.So when drift 22 declines, striker 24 is by being pressed in the diel 26 that capstan head 25 is installed, stamped workpieces.

In addition, two ends extension 20a, 20b of eccentric shaft 20 extend outward from support 11a, 11b, are arranged on the outside of support 11a, 11b using this extension 20a, 20b as servomotor 30a, 30b of motor main shaft 31a, 31b respectively.

Servomotor 30a with the extension 20a of eccentric shaft 20 for motor main shaft 31a is formed.Namely, by around the extension 20a of eccentric shaft 20, on the outer periphery setting-in along the circumferential direction at predetermined intervals (90 ° of intervals) equip the sleeve 33a of even number (4) as magnet (permanent magnet) 32a of magnetic pole, fix with lining 34a, form rotor 35a.So the extension 20a becoming the eccentric shaft 20 of the central shaft of this rotor 35a is motor main shaft 31a self.Therefore, servomotor 30a uses in fact eccentric shaft 20 as rotor 35a along extension 20a.

In addition, servomotor 30a, the urceolus 36a of exterior winding threephase armature coil Ua, Va, Wa on rotor 35a, fixing on support 11a, form stator (stator) 37a thus.

On the other hand, servomotor 30b, and servomotor 30a is same, with the extension 20b of eccentric shaft 20 for motor main shaft 31b is formed.Namely, by around the extension 20b of eccentric shaft 20, on the outer periphery setting-in along the circumferential direction at predetermined intervals (90 ° of intervals) equip the sleeve 33b of even number (4) as magnet (permanent magnet) 32b of magnetic pole, fix with lining 34b, form rotor 35b.So the extension 20b becoming the eccentric shaft 20 of the central shaft of this rotor 35b is motor main shaft 31b self.Therefore, servomotor 30b uses in fact eccentric shaft 20 as rotor 35b along extension 20b.

In addition, servomotor 30b, the urceolus 36b of exterior winding threephase armature coil Ub, Vb, Wb on rotor 35b, fixing on support 11b, form stator (stator) 37b thus.

Like this, servomotor 30a and servomotor 30b is same motor, but specular is formed mutually, except specular this point, identical mutually, because mutual rotor 35a, rotor 35b one is formed, therefore the rotary encoder 38 of detection rotor 35a, rotor 35b rotational angle be only arranged on a side share, in addition, there is speed-torque characteristic identical mutually, use the torque based on this speed-torque characteristic by synthesis, there is the performance that the punch pressure needed occurs.

Namely, position of magnetic pole (the magnetic pole circumferential locations of magnet 32b) the specular location and installation mutually of the position of magnetic pole (the magnetic pole circumferential locations of magnet 32a) of the rotor 35a of servomotor 30a and the rotor 35b of servomotor 30b, in addition, the mutual specular location and installation of circumferential locations of the circumferential locations of threephase armature coil Ua, Va, Wa of servomotor 30a and threephase armature coil Ub, Vb, Wb of servomotor 30b.

Therefore, as shown in Figure 3, the words that the analog line driver 42b of the servo amplifier 40b of the analog line driver 42a as the servo amplifier 40a of the control circuit of servomotor 30a and the control circuit as servomotor 30b drives by same gate signal, servomotor 30a and servomotor 30b only flow through same-phase, the three-phase alternating current of same current value, therefore the torque vector of servomotor 30a and the torque vector same-phase of servomotor 30b, identical, therefore, the synthesis torque of servomotor 30a and servomotor 30b correctly becomes two servomotor 30a, the torque of 30b and.This relation, servomotor 30a and servomotor 30b as shown in Figure 1, Figure 3 split is formed, but forms as parallel three phase circuit one as aftermentioned Figure 14, Figure 16, also identical.

Servo amplifier 40a, as shown in Figure 3, by three-phase commercial ac power source is carried out to the converter 41a of A-D conversion and analog line driver 42a and arrange at the leading portion of analog line driver 42a suppress the reactor 43a of peak point current and the capacitor 44a of electric power storage capacious to form by cut-off high-frequency current component, by 6 power transistor Q with gate signal driving power driver 42a, use the three-phase alternating current of analog line driver 42a to export and drive servomotor 30a.Each power transistor Q of analog line driver 42a connects the diode D for flowing through the regenerative current occurred between the deceleration period of servomotor 30a, and regenerative current flows into capacitor 44a and puts aside as regenerating power.Capacitor 44a uses this regenerating power, supplies because reactor 43a is to the not enough electric energy of the suppression of peak point current and the electric energy of high speed motion and/or the electric energy of punching press.In addition, servo amplifier 40b is also formed completely equally with servo amplifier 40a.

By such servo amplifier 40a, the control of 40b, servomotor 30a, 30b, be arranged in the L position (with reference to Fig. 4 A to Fig. 4 C) of the decline end position of the required regulation of punch process by making the eccentric axial portion 20e of eccentric shaft 20 and be equivalent to return from this position being equivalent to drift 22, the striker 24 being positioned at drift 22 lower end leaves and moves up and down like that between the H position of the rising end position above diel 26 (with reference to Fig. 4 A to Fig. 4 C), eccentric shaft 20 is made only to be equivalent to L, angular range, theta between H two positions moves back and forth, carry out the processing of workpiece.

As shown in Figure 4 A, be equivalent to the L position of the eccentric axial portion 20e of the eccentric shaft 20 of the decline end position of drift 22, be set in by the offset E of eccentric shaft 20 (distance of the axis of eccentric shaft 20 and the axis of eccentric axial portion 20e) determine can the bottom-end of stroke B entirely moved up and down a little in front of above, in addition, the H position being equivalent to the eccentric axial portion 20e of the eccentric shaft 20 of the rising end position of drift 22 is set in the intermediate altitude M below a little than the stroke that can entirely move up and down of drift 22.That is, the above-mentioned reciprocating rotation angular range, theta of eccentric shaft 20 is also about 40 ° ~ about 60 ° by the travel settings of the diel 26 used.

In addition, as shown in Figure 4 B, servomotor 30a, 30b, when more mold exchange, when turret rotated etc., the eccentric axial portion 20e (i.e. drift 22) of eccentric shaft 20 is positioned in top dead-centre T.Then servomotor 30a, 30b starts with processing, by making the eccentric axial portion 20e of eccentric shaft 20 after making drift 22 decline from this top dead-centre T to the L position motion of the decline end position being equivalent to drift 22, carrying out first time punch process, turn back to the H position of the rising end position being equivalent to drift 22, in this position, drift 22 is waited for, in punch process after second time, make to move back and forth in the above-mentioned reciprocating motion angular range, theta of the eccentric axial portion 20e of eccentric shaft 20 between H position and L position.

Further, in the circle slewing area of the eccentric axial portion 20e of eccentric shaft 20, as only used side semi-circumference quantity shown in Fig. 4 B, existing and producing unaccommodated possibility owing to can not lubricating oil be used equably generally to lubricate when starting.For avoiding such being not suitable for, making servomotor 30a, 30b as required as the semi-circumference that Fig. 4 C also uses opposite side and forming.Preferably such as when occasion or each turret rotated of more mold exchange, or the punching press number of times etc. that correspondence often predetermines, automatically carry out the switching of side shown in side and Fig. 4 C shown in such Fig. 4 B.

In addition, the turret punching-press 10 of the present embodiment, as mentioned above, because a pair servomotor 30a, 30b are arranged on the outside of support 11a, 11b respectively, therefore only can not produce distortion in each portion of the machinery of the side being equivalent to eccentric shaft 20.Namely, such as servomotor 30a, 30b also only can be arranged on the outside of support 11a or 11b of side as 1 servomotor (30) that parallel three phase circuit one is formed, but in this occasion, because the stress caused due to the weight of servomotor (30) is only born by support 11a or 11b of side, therefore at two stands 11a, 11b is upper can produce distortion, in addition, the distortion of the uneven generation of the heat that the heating due to servomotor (30) causes can be produced, have again, because bearing portion 12a, the stress of 12b is also different mutually, therefore the countermeasure seeking to tackle these is needed.But, in the occasion of this turret punching-press 10, have also disperseed without such stress deformation, heat, the advantage of equalization, therefore can realize stable operation.

As mentioned above, servomotor 30a, 30b Direct driver eccentric shaft 20, reciprocating motion angular range, theta between the L position of decline end position being equivalent to drift 22 and the H position being equivalent to rising end position moves back and forth continuously, carries out outside Continuous maching to workpiece, and the high speed for drift 22 is also very effective.

Below, use key diagram shown in Fig. 5 to Figure 13 B that the effect of above-described embodiment is described.

Fig. 5 represents that the example of the speed-torque characteristic of servomotor 30a, 30b 1., 2., the figure shows the payload of bearing according to drift 22, outside the driving torque that the drift 22 required for the size of this load occurs, also represent the speed limit that servomotor 30a, 30b can operate.

Known to from Fig. 5, servomotor 30a, 30b, because the torque needed when the load that drift 22 bears is light is little, so the actuating speed not reducing drift 22 accelerates drawing velocity, on the other hand, because the torque needed when the load that drift 22 bears is heavy becomes large, the drawing velocity so the actuating speed reducing drift 22 slows down.Originally, the generation of the noise in punch process, have various according to the material of workpiece, thickness of slab and other various conditions, but be well known that: when the driving drawing velocity of drift is fast, noise is large, the slower noise of drawing velocity is less, in addition, and the words that drawing velocity is certain, when load is light, noise is little, and the heavier noise of load is larger.Therefore, the speed-torque characteristic of servomotor 30a, 30b as shown in Figure 5, along with load increases the weight of to reduce drift speed, noise is also just along with lowering.And the reduction of such drift speed, does not hinder operating efficiency, this measured data from the punch process for various workpiece shown below and the feature based on these data are extracted Wave data out and can be understood.

Fig. 6 indicates the measured data without punch process during workpiece, and Fig. 7 A represents that the feature based on this measured data extracts Wave data out, and Fig. 7 B represents its punching press torque speed characteristic.

As shown in Fig. 6, Fig. 7 A, Fig. 7 B, when there is no workpiece, before 1 cycle of drift 22 in the half period, rate curve and torque curve both rise in forward direction, keep certain value, thus, forcer position curve in fact evenly declines from rising end position (being equivalent to H position) to decline end position (being equivalent to L position).Then, interim in the second half in 1 cycle of drift 22, rate curve and torque curve both rise in reverse directions, keep certain value, thus, forcer position curve in fact evenly rises from decline end position (being equivalent to L position) to rising end position (being equivalent to H position).

Fig. 8 represents with the measured data of punch process during minor diameter punching drawing quality steel sheet workpiece, and Fig. 9 A represents that the feature based on these data extracts Wave data out, and Fig. 9 B represents its punching press torque speed characteristic.

As shown in Fig. 8 to Fig. 9 B, when with minor diameter punching drawing quality steel sheet workpiece, the movement before 1 cycle of drift 22 in the half period is different with the occasion of Fig. 6 to Fig. 7 B.That is, initial actuating is identical with the occasion of Fig. 6 to Fig. 7 B, and rate curve and torque curve both rise in forward direction, become certain value, and thus, forcer position curve in fact evenly declines from rising end position (being equivalent to H position).But, when the striker 24 of drift 22 lower end is pressed into diel 26, the load be subject to from workpiece by its most advanced and sophisticated conflict workpiece above, torque curve sharply rises, and rate curve reduces simultaneously, and the decline with this point forcer position curve slows down (slowly).Then, the tip of diel 26 drops to the load be subject to from workpiece in front of below workpiece and suddenly subtracts, then torque curve sharply declines, and rate curve exceedes and reduces the above-mentioned certain value of quantity and accelerate by return speed simultaneously, with this point, forcer position curve also accelerates decrease speed.Thereafter, interim in the second half in 1 cycle of drift 22, and the occasion of Fig. 6 to Fig. 7 B is same, forcer position curve in fact evenly rises from decline end position (being equivalent to L position) to rising end position (being equivalent to H position).

Figure 10 represents with the measured data of punch process during major diameter punching punching press same thin plate workpiece, and Figure 11 A represents that the feature based on these data extracts Wave data out, and Figure 11 B represents its punching press torque speed characteristic.

As shown in Figure 10 to Figure 11 B, when with major diameter punching drawing quality steel sheet workpiece, the movement before 1 cycle of drift 22 in the half period is different with the occasion of Fig. 8 to Fig. 9 B.That is, initial actuating is identical with the occasion of Fig. 8 to Fig. 9 B, and rate curve and torque curve both rise in forward direction, become certain value, and thus, forcer position curve in fact evenly declines from rising end (being equivalent to H position).But, during the load that the striker 24 of drift 22 lower end is pressed into diel 26, be subject to from workpiece, than the occasion of Fig. 8 to Fig. 9 B, because the diameter of punching is large, so the load be subject to from workpiece is large, therefore, torque curve is made the earth than the occasion of Fig. 8 to Fig. 9 B and is risen, simultaneously rate curve is made the earth than the occasion of Fig. 8 to Fig. 9 B and is reduced, with this point, the occasion of suppression ratio Fig. 8 to Fig. 9 B of forcer position curve delay (slowly) many.Then, the tip of diel 26 drops in front of below workpiece, from the anxious words subtracted of load that workpiece is subject to, torque curve sharply declines, simultaneously rate curve is than the return speed occasion that reduces Fig. 8 to Fig. 9 B of quantity doing the earth acceleration, with this point, forcer position curve is also made the earth than the occasion of Fig. 8 to Fig. 9 B and is accelerated decrease speed.Thereafter, interim in the second half in 1 cycle of drift 22, and the occasion of Fig. 8 to Fig. 9 B is same, forcer position curve in fact evenly rises from decline end position (being equivalent to L position) to rising end position (being equivalent to H position).

Figure 12 represents with the measured data of punch process during minor diameter punching punching press slab workpiece, and Figure 13 A represents that the feature based on these data extracts Wave data out, and Figure 13 B represents its punching press torque speed characteristic.

As shown in Figure 12 to Figure 13 B, when with minor diameter punching punching press slab workpiece, than the occasion of Fig. 8 to Fig. 9 B, because the plate thickness of workpiece is thick, so the load being subject to workpiece is large, therefore the movement before 1 cycle of drift 22 in the half period is different with the occasion of Fig. 8 to Fig. 9 B, but compares with the occasion of Figure 10 to Figure 11 B, it makes no odds.

Like this, according to the size of the load that drift 22 bears, rate curve reduces, the decline of forcer position curve slows down the words of (slowly), because exceed certain value just to accelerate return the rate curve that its speed reduces quantity, forcer position curve also accelerates decrease speed, so the reduction of the drift speed caused by load is absorbed as the acceleration and deceleration in 1 cycle of drift 22, is eliminated, therefore, the time needed by 1 cycle of drift 22 is not changed in fact, can not hinder the high speed of drift 22.

The speed-torque characteristic of such motor, can illustrate as follows.Motor is the device of the energy acted on load the transformation of electrical energy of supply, in the occasion of servomotor 30a, 30b, the electric energy of supply is determined capacity by servo amplifier 40a, 40b, in addition also by the restriction of supply voltage, can not apply the voltage of more than supply voltage.

On the other hand, act on the energy on load, i.e. motor torque, in the occasion of servomotor 30a, 30b, because in the drift down maneuver of the repetition period of the reversion of the rotating forward of the suitable acceleration declined making drift 22 and the suitable acceleration that makes drift 22 increase, be the punching press action performing punching press, the torque of the kinetic energy that drift 22 occurs can be divided into and the torque of punching press plus-pressure occurs.

In such occasion, the words (the slow words that move up and down of drift 22) that acceleration is very low because it is little that the torque of kinetic energy occurs, thus can utilize motor torque almost all as the torque of plus-pressure generation.Therefore, even if due to the large plus-pressure of the conditional request of the thickness of slab, material etc. of workpiece, this plus-pressure also fully can be there is, there will not be the torque that kinetic energy occurs not enough, the speed of drift 22 is exerted one's influence.

To this, because require acceleration (moving up and down of drift 22 is fast) high to a certain degree, because which limit the torque that can occur as plus-pressure in motor torque from operating efficiency grade in practice.Therefore, when the plus-pressure that the conditional request of thickness of slab, material etc. due to workpiece is large, use the major part of motor torque for there is this plus-pressure, the torque that kinetic energy occurs is not enough, can not maintain the decrease speed of drift 22, the decrease speed of drift 22 is just slowed down.

But the decrease speed of this drift 22 is slowed down and is only with the extremely useful characteristic of the noise of punching press action of punch process, the low noise of vibrations, low vibrationsization just.Namely, due to the thickness of slab of workpiece, when the plus-pressure (pressurization tonnage) of the conditional request of material etc. is smaller, because the speed of the decrease speed of drift 22 reduces little, so the punching press action of light load is than very fast, in addition when the plus-pressure required (pressurization tonnage) is larger, because the speed of the decrease speed of drift 22 reduces large, so the punching press action of heavy load is slow, and, the variation of such drawing velocity, because automatically determine according to required plus-pressure (pressurization tonnage), so do not need the instruction of the punching press pattern (drop mode of drift 22) according to punching press tonnage.That is, by not maintaining the decrease speed of drift 22, optimal punching press pattern (drop mode of drift 22) can automatically be generated.

On the contrary, determine the motor torque of servomotor 30a, 30b of the capacity of the electric energy supplied by servo amplifier 40a, 40b, the kind of corresponding workpiece to be processed in turret punching-press 10, the speed-torque characteristic of servomotor 30a, 30b of being used by setting, make to become the motor torque generating most suitable punching press pattern (drop mode of drift 22) from light load to heavy load, the noise of the punching press action with punch process, the low noise of vibrations, low vibrations can be realized.

Like this, do not utilize connecting rod and flywheel etc. mechanism motor-drift action axle direct attachment type electrodynamic type stamping machine in, explanation according to Fig. 5 to Figure 13 B, the noise of the punching press action with punch process, the low noise of vibrations, low vibrations can be realized, its result, has and the same speed-torque characteristic of servomotor 30a, 30b according to servo drive system of the present invention (Continuous maching system) 1.

Reactor 43a, 43b of servo amplifier 40a, 40b and the effect of capacitor 44a, 44b are described here.

If the value of reactor 43a, 43b is L, then because impedance Z is Z=2 π fL, so be divided into large impedance for the one-tenth that frequency is high.Therefore, reactor 43a, 43b can suppress peak point current by cut-off high-frequency current component, because the peak power of servo amplifier 40a, 40b can be suppressed thus, so by using reactor 43a, 43b that L value is very large, the occasion utilizing the mechanism such as connecting rod and flywheel of ratio, can be adjusted to the contract power with Utilities Electric Co. the peak power not needing in fact to change.

But, carry out in punch process at use stamping machine, eccentric shaft 20 high speed motion moved up and down for making drift 22 needs large kinetic energy, and its frequency is also high, the L value of reactor 43a, 43b is very large, has the worry that the electric energy of the supply high speed motion from servo amplifier 40a, 40b to servomotor 30a, 30b is inadequate.In addition, carry out in punch process at use stamping machine, because need large punching press energy when punch process, if so the L value of reactor 43a, 43b is very large, there is the worry that the electric energy of the supply punching press action from servo amplifier 40a, 40b to servomotor 30a, 30b is inadequate.

Therefore, for supply supplies the electric energy of such high speed motion and/or the electric energy of punching press action from servo amplifier 40a, 40b to servomotor 30a, 30b, capacitor 44a, 44b are set, by using capacitor 44a, 44b that capacity is very large, can fully supply the required electric energy of high speed motion and/or the required electric energy of punching press action from servo amplifier 40a, 40b to servomotor 30a, 30b.

Therefore, by capacitor 44a, 44b of using L value very large reactor 43a, 43b to use capacity very large simultaneously, while can reducing peak power as required, the high speed stamping processing of the original performance of corresponding turret punching-press 10 can be performed.

In addition, in the above-described embodiments, be illustrated premised on a body action to make two servomotor 30a, 30b, but be not limited thereto, such as, in load occasion that is very light, that only just can fully process with the torque of servomotor 30a or 30b of side, be energized only to wherein servomotor 30a or 30b of either party and make it action.Such work, than make two servomotor 30a, 30b as the occasion of a body action for so very light load, may contribute to the decrease speed of drift 22 is slowed down, become low noise, be expected the effect being saved electric power in addition.But, preferably seek the heating countermeasure of necessity such as cooling.

Figure 14 is the skiagraph of the important part of another embodiment of the servo drive system (Continuous maching system) represented according to press of the present invention, Figure 15 is its right hand view, and the servo drive system (Continuous maching system) 101 of this press uses in turret punching-press 110.

This turret punching-press 110, replace a pair servomotor 30a, 30b, as shown in figure 16, use 1 servomotor 130 that one is formed using servomotor 30a, 30b as parallel three phase circuit, there is the speed-torque characteristic same with servomotor 30a, 30b.Therefore, servomotor 130 is large-scale than servomotor 30a or 30b mono-side, correspondingly, eccentric shaft 120 only at one end forms the extension 120a more extended than extension 20a, is arranged on the outside of support 111a using this extension 120a as the servomotor 130 of motor main shaft 131.Other structures of the servo drive system (Continuous maching system) 101 of press are because identical with servo drive system (the Continuous maching system) 1 of the press shown in Fig. 1, Fig. 2, so add that the symbol of 100 represents by being accompanied by same part on the symbol that uses in Fig. 1, Fig. 2, and omit the detailed description for each several part of the servo drive system (Continuous maching system) 101 of press.In addition, the effect of the servo drive system (Continuous maching system) 101 of press is also identical with servo drive system (the Continuous maching system) 1 of press.

Like this, only have the turret punching-press 110 of 1 servomotor 130 (single driving) to compare with the turret punching-press 10 of the Dual Drive with a pair servomotor 30a, 30b, there is difference below.That is, in the occasion of single turret punching-press 110 driven, because only born the stress caused by servomotor 130 by support 111b, therefore on support 111a, 111b, distortion is produced.In addition, due to the heating of servomotor 130, also produce by the uneven distortion caused of heat.In addition, the stress of bearing portion 112a, 112b is also different mutually.Therefore, the countermeasure of seeking for these is needed.To this, in the occasion of the turret punching-press 10 of Dual Drive, have and there is no stress deformation, heat is also disperseed, the such advantage of equalization.

In addition, in the above-described embodiments, formed using two ends extension 20a, 20b of eccentric shaft 20 self as main shaft 31a, 31b of servomotor 30a, 30b, but be not limited thereto, if necessary, eccentric shaft 20 and main shaft 31a, 31b such as also can be made to form as different parts, the both ends that other suitable means are separately fixed at main shaft 31a, 31b eccentric shaft 20 such as to be bolted, both can be made thus one to form, in addition, the relation of the main shaft 131 of eccentric shaft 120 and servomotor 130 too.

In addition, in the above-described embodiments, servo drive system (Continuous maching system) 1,101 uses in turret punching-press 10,110, but is not limited thereto, and also can use in the various press beyond turret punching-press.

In addition, No. 2002-177143rd, Japan's patent application (application on June 18th, 2002), No. 2002-177150th, Japan's patent application (application on June 18th, 2002), No. 2002-177149th, Japan's patent application (application on June 18th, 2002), No. 2003-145372nd, Japan's patent application (application on May 22nd, 2003), No. 2003-145374th, Japan's patent application (application on May 22nd, 2003), the full content of No. 2003-145377th, Japan's patent application (application on May 22nd, 2003) and No. 2002-177145th, Japan's patent application (application on June 18th, 2002), be combined in as a reference in present specification.

The invention is not restricted to the explanation of foregoing invention embodiment, by carrying out suitable change, can implement with other various forms.

Claims (4)

1. a servo drive system for press, in the press using servomotor as the power source of drift, is characterized in that,

As described servomotor, if use based on the torque of the speed-torque characteristic of motor, the punch pressure that do not utilize the inertia of mechanism can occur to need be subject in the down maneuver of drift from workpiece load, can by reducing according to this load the servomotor that the speed of motor reduce the decrease speed of drift

By the action axle that described servomotor Direct driver makes drift move up and down,

The speed-torque characteristic of described servomotor is arranged to: torque diminished when the load that above-mentioned drift bears is light, and the actuating speed not reducing above-mentioned drift accelerates drawing velocity; When the load that above-mentioned drift bears is heavy, torque is become large, the drawing velocity and the actuating speed reducing above-mentioned drift slows down.

2. servo drive system according to claim 1, is characterized in that: the described action axle eccentric shaft that described drift is moved up and down is formed; And described servomotor is formed using described eccentric shaft as motor main shaft.

3. a servo drive system for press, in the press using servomotor as the power source of drift, is characterized in that,

As described servomotor, if be used in the two ends setting relative to each other of the action axle that described drift moves up and down and synthesis use based on the torque of mutual same speed-torque characteristic, the punch pressure that do not utilize the inertia of mechanism can occur to need be subject in the down maneuver of drift from workpiece load, can by reducing according to this load a pair servomotor that the speed of motor reduce the decrease speed of drift

By making described a pair servomotor as action axle described in one Direct driver,

The speed-torque characteristic of described servomotor is arranged to: torque diminished when the load that above-mentioned drift bears is light, and the actuating speed not reducing above-mentioned drift accelerates drawing velocity; When the load that above-mentioned drift bears is heavy, torque is become large, the drawing velocity and the actuating speed reducing above-mentioned drift slows down.

4. servo drive system according to claim 3, is characterized in that: the described action axle eccentric shaft that described drift is moved up and down is formed; And described servomotor is formed using described eccentric shaft as motor main shaft.