JP2001025900A - Gib block correction device of c-frame press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avert the deformation of a gib block which occurs in mouth open ing without the reinforcement of structural members by providing a correction device with the gib block movably in a longitudinal direction and further, provid ing the device with a moving means for moving the gib block and a gib block moving quantity control means for controlling the moving quantity of the gib block. SOLUTION: When press work is started and working of material begins upon descending of a slide, a C-frame press machine gives rise to the mouth opening by receiving the load and the gib block 13 begins to incline. A hydraulic pump control circuit changes over to high pressure simultaneously with the start of the press work and a hydraulic cylinder 11 is driven via a servo valve by the pressure of the oil discharged from a hydraulic pump and accumulated in an accumulator, by which the oil pressure is exerted to an oil port. Since a rod 12 is pushed forward of the press machine, the gib block 13 is extruded forward of the press machine 1 with a lower pin 10 as a fulcrum, by which the inclination of the gib block 13 is corrected. The moving quantity of the gib block 13 is controlled by controlling the servo valve with a controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a give device for slidably supporting a slide of a C frame press. More specifically, the present invention relates to an apparatus for correcting a tilt of a slide due to a mouth opening of a C frame press.

[0002]

2. Description of the Related Art Conventionally, in a C-frame press, when a frame is subjected to a press load by press working, a so-called opening phenomenon occurs due to structural characteristics. as a result,
There is a problem that the gib fixed to the frame is deformed, and thus the slide is tilted, which adversely affects the mold and the pressed product. As a typical prior art for solving this problem, there is a technique of reinforcing a portion of the frame where a load is most applied or improving a slide gib.

[0003] In Utility Model Registration No. 2574090, a C-frame press in which a side frame is divided vertically in the front-rear direction and an L-shaped reinforcing member is fixed to the inner surface of the side frame from the lower jaw to the upper jaw. Are disclosed.

In such a device, an L-shaped reinforcing member is fixed to the side frame, and the cross section of the frame is made almost symmetrical, thereby suppressing elongation and waving phenomenon caused by falling in the plate thickness direction. Can be reduced.

In Japanese Patent Application Laid-Open No. Hei 7-314197, a slide guide is divided into an upper part and a lower part, and fixed gibbs provided at the upper and lower parts are provided with a slide stroke considering a slide stroke length, a slide adjustment amount, and a liner length. A slide guide device of a C frame press having a length for guiding the entire movement range is disclosed.

In this invention, even when the slide is at the bottom dead center position of the slide stroke, the slide is guided by the movable gib guide and the fixed gib, which are vertically divided into two parts, so that the positional accuracy of the slide is kept high. In addition, since the lower end of the guide is located at a lower position, it is possible to suppress a decrease in slide position accuracy even when the opening of the frame occurs due to the processing load of the press working.

[0007]

However, in a C frame press in which the frame is reinforced, the weight of the machine is increased by reinforcing the frame, and as a result, the costs such as manufacturing costs and transportation costs are greatly increased. . When the slide guide is divided, the plate that supports the fixed gib receiving the load, that is, the lower fixed gib, is reinforced. As a result, the cost is increased as described above.

In the above-described method in which the maintenance of the parallelism of the slide depends on the mechanical strength, further reinforcement of the frame or the like is required to maintain the parallelism with higher accuracy. It becomes a press machine with excessive strength, and it is hard to say that it is a press machine compatible with recent high-mix low-volume production.

Accordingly, an object of the present invention is to provide a C-frame press which avoids deformation of a gib caused by a mouth opening without reinforcing structural members, maintains the parallelism of a slide with high accuracy, and reduces production costs and other costs. It is an object of the present invention to provide a gibbing correction device for reducing the difference.

[0010]

According to a first aspect of the present invention, in a C frame press, a gib movably provided in a front-rear direction, a gib moving means for moving the gib, and a moving amount of the gib are controlled. The present invention is a gib correction device provided with gib movement amount control means.

In this invention, the deformation of the gib caused by the opening phenomenon of the C frame press, that is, the inclination of the gib with respect to the bolster is corrected by moving the gib back and forth. As a result, the parallelism of the slide can be accurately maintained without reinforcing the structural members of the C-frame press even when the opening phenomenon occurs.
Further, by controlling the moving amount of the give, it is possible to cope with different pressing operations, that is, different opening amounts.

According to a second aspect of the present invention, the give moving means includes:
A gib correction device comprising: a hydraulic cylinder having a rod connected to the gib; and a hydraulic circuit for operating the hydraulic cylinder.

In this invention, in addition to the effect of the first aspect of the present invention, the use of the hydraulic cylinder as the gib moving means can sufficiently output the force necessary for the gib movement, and the fine movement can be performed. The control becomes possible, and it is possible to obtain an inexpensive giving means having a simple structure.

The invention according to claim 3 is characterized in that the give movement control means includes a press load detecting means, and converts the give movement into a give movement corresponding to the press load value detected by the press load detecting means. This is a give correction device.

In this invention, the give movement control means is provided with a press load detecting means, and the give movement is controlled based on the detected value of the press load. In other words, using the fact that the opening amount is proportional to the press load value, the correction amount of the give corresponding to the detected press load value is automatically calculated, and the move amount of the give is controlled based on the result. In addition to the effects of the first and second aspects of the present invention, it is possible to automate the give correction and maintain the parallelism of the slide with high accuracy.

According to a fourth aspect of the present invention, the giving movement amount control means includes a frame deformation amount detecting means for detecting a deformation amount of the frame due to the pressing operation, and the deformation amount of the frame detected by the frame deformation amount detecting means. The present invention is directed to a give correction device for converting a give movement amount corresponding to the following.

In this invention, the giving movement amount control means is provided with a frame deformation amount detecting means, that is, a detecting means for detecting the opening amount, and the giving movement amount is controlled based on the detected value of the deformation amount. As a result, in addition to the effects of the first and second aspects of the present invention, it is possible to automate the give correction and maintain the parallelism of the slide with high accuracy.

According to a fifth aspect of the present invention, the give movement control means includes a press load detecting means, and stores a change in the press load during one cycle of the press for one cycle or a plurality of cycles. The present invention is a gib correction apparatus characterized by converting the value into a gib correction amount corresponding to a value.

In this invention, the change in the press load during one cycle of the press is stored in the control device, the give correction amount corresponding to the press load is calculated, and the give movement is controlled based on the result. . As a result, claim 1
In addition to the effect of the second aspect, even when the number of slide strokes is high and the press load changes during one cycle of the press, the give correction can be automatically performed.

According to a sixth aspect of the present invention, the gib movement amount control means includes a frame deformation amount detecting means for detecting a deformation amount of the frame due to the press work, and the change in the deformation amount of the frame during one cycle of the press is detected by one. The present invention is a gib correction apparatus characterized by storing a cycle or a plurality of cycles and converting the stored into a gib correction amount corresponding to the stored frame deformation amount.

In this invention, the amount of deformation of the frame during one press cycle, that is, the change in the opening amount, is stored in the control device, and the Gib correction amount corresponding to the amount of deformation of the frame is calculated. The moving amount of the give is controlled based on the given. As a result, in addition to the effect of the invention of claim 1 or 2, the number of slide strokes is high, and
Even when the amount of deformation of the frame during one cycle of the press changes, the give correction can be automatically performed.

According to a seventh aspect of the present invention, the give movement amount control means includes a product accuracy measuring device for a product by press working, and converts a measured value detected by the product accuracy measuring device into a give correction amount. This is a characteristic give correction device.

In this invention, the product accuracy of the product produced by the press working is measured, converted into a gibbing correction amount corresponding to the measured value of the product accuracy, and the moving amount of the gib is controlled based on the result. . As a result, in addition to the effects of the first or second aspect of the invention, the accuracy of the product produced by the press working is stabilized, and furthermore, it can be used for the rationalization of production management.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 and 2, a press machine 1 has a C-shaped frame 2, and a bolster 3 is provided on a bed portion of the frame 2. The slide 4 is slidably supported up and down by a give correction mechanism 5. The lower end of the connecting rod 6 having a spherical shape is connected to the slide 4 via a connecting mechanism 7 provided inside the slide 4, and the upper end is connected to an eccentric part of the crankshaft 8. The crankshaft 8 performs a rotational motion by a rotational force from a flywheel (not shown). On the other hand, an oil chamber 7 </ b> A is provided inside the coupling mechanism 7. By measuring the oil pressure of the oil chamber 7A with a pressure head (not shown) during the press work, the press load can be calculated by the load meter based on the measured value.

Next, referring to FIGS. 3 and 4, the details of the give correction mechanism 5 will be described. The upper part of the give 13 is the hydraulic cylinder 1
It is supported by being fixed to one rod 12. The lower portion of the give 13 is provided with a connecting portion 13 provided at the lower portion of the give 13.
A is supported by being pivotally connected to a lower pin 10 fixed to the frame 2. The hydraulic cylinder 11 is pivotally connected to an upper pin 9 fixed to the frame 2. Further, the rod 12 is provided with a position sensor 14 for detecting the position of the give 13 by measuring the amount of expansion and contraction of the rod 12.

The hydraulic cylinder 11 has oil ports 15A, 15B
Is provided. A hydraulic line is connected to the oil ports 15A and 15B, and a hydraulic circuit 50 shown in FIG.
Is formed.

In FIG. 5, the hydraulic circuit 50 is provided with a servo valve 54 for controlling the moving amount and moving direction of the hydraulic cylinder 11, and the pressure in the cylinder is provided between the hydraulic cylinder 11 and the servo valve 54. That is, a pressure head 55 is provided for measuring the thrust force on the give 13 and detecting and protecting the overload on the give 13. On the other hand, the hydraulic pump 51 is provided with a motor 52.
Between the servo valve 54 and the hydraulic pump 51,
An accumulator 66 is provided to quickly move the give 13, and accumulates hydraulic pressure discharged from the hydraulic pump 51. The hydraulic pressure output from the hydraulic pump 51 is controlled by a pump pressure control valve 58 and three relief valves 5.
9, the pressure is controlled in three stages of high pressure, medium pressure and low pressure. On the other hand, a hydraulic cylinder normal pressure valve 65 and a relief valve 64 are provided between the hydraulic cylinder 11 and the hydraulic pump 51 in order to keep the hydraulic pressure in the cylinder of the hydraulic cylinder 11 constant. The oil tank 68 is provided with a fan cooler 61 for cooling the oil. For preventing oil sludge, a suction filter 67 is provided on the suction side of the hydraulic pump 51, and a line filter 60 is provided on the discharge side. In addition, the hydraulic circuit 50 is provided with a pressure gauge 53 and check valves 62 and 63 as necessary.

Next, FIG. 6 shows a control device configuration diagram of the give correction device. A / D converter 85 for converting a signal from a pressure head for load detection in controller 80
And an A / D converter 84 for converting a signal from the position sensor 14. On the other hand, there is provided a PIO device 81 that performs PIO transfer of a signal from a rotary cam for detecting a crank angle of the press and an upper external signal such as an interlock to the MPU 82. The controller 80 is provided with an MPU 82 for processing signals from the A / D converters 84 and 85 and the PIO device 81. The D / A converter 83 outputs the processing result of the MPU 82 to the servo amplifier.
Is provided. In the controller 80, FIG.
Are stored in a ROM (not shown), and the arithmetic processing of the MPU 82 is performed according to the block diagram.

Here, "load-correction amount conversion" shown in FIG.
In order to perform the processing, the position of the give 13 corresponding to the load value is measured in advance, and the result is stored in the controller 80.

Since the crank angle detected by the rotary cam can be input to the MPU 82, the controller 80 can store the press load for each arbitrary angle.

Next, the operation of the above configuration will be described. The hydraulic pump 51 is started by another start signal before starting the press work. At this time, by setting the hydraulic pump control circuit 50A to a low pressure, the hydraulic pump control circuit 50A is controlled so that a load of a certain pressure or more is not applied to the hydraulic pump 51.

When the pressing operation is started and the slide 4 is lowered by the rotation of the crankshaft 8 and the material starts to be processed, the press machine 1 receives a load. At this time, the press machine 1 having the C-shaped frame 2 causes an opening phenomenon,
Therefore, the give 13 provided on the frame 2 via the pin starts to tilt.

At the same time as the pressing operation is started, the hydraulic pump control circuit 50A switches to high pressure and the hydraulic pump 5
The oil discharged from 1 is accumulated in the accumulator 66. The hydraulic cylinder 11 is driven via the servo valve 54 by the hydraulic pressure accumulated in the accumulator 66. That is, when hydraulic pressure is applied to the oil port 15A, the rod 1
2 is pushed out to the front of the press machine 1 so that the give 13
Is pushed out of the press machine 1 with the lower pin 10 as a fulcrum. FIG. 8 shows a state in which the above operation is performed when the press machine 1 is opened by the press load. However, the actual angle θ is minute, and the figure is exaggerated.

Even if the connecting rod 6 is tilted back and forth with respect to the bolster 3, the connecting portion between the connecting rod 6 and the connecting mechanism 7 is spherical.
No thrust force is generated.

The controller 80 controls the servo valve 5
By controlling the number 4, the amount of movement of the give 13 is controlled. That is, according to FIG. 6, when a press load occurs,
A detection value from the pressure head for load measurement is converted into a load value by a load meter, and the MPU is converted through an A / D converter 85.
82 is input. On the other hand, the position of the give 13 detected by the position sensor 14 is also transmitted through the A / D converter 84 to the MPU 8.
2 is input. The MPU 82 outputs a signal based on the control block diagram shown in FIG. 7 to the servo amplifier via the D / A converter 83, and controls the servo valve 54.

That is, according to FIG. 7, in the MPU 82, the value obtained by converting the correction amount corresponding to the press load, that is, the position of the give 13 corresponding to the previously measured press load and the give 1
Based on the current position of No. 3, a process of converting an appropriate give correction amount using PID control is performed.

If the number of press strokes (spm) is fast, the hydraulic cylinder 11
, The movement of the give 13 may not easily follow the speed of the slide 4. In this case, the controller 80 stores in advance the press load for each crank angle in one cycle of the press for one cycle or a plurality of cycles. During the continuous operation of the press, by controlling the hydraulic cylinder based on the stored data, the speed of the slide 4 can be followed even when the stroke number (spm) of the press is high. The control of the give 13 based on the stored data can be applied even when the press load changes during one cycle.

In one press cycle, the hydraulic pump control circuit 50A is set to a high pressure during material processing.
When processing is not performed, medium pressure or low pressure can be set. That is, when high pressure is not required for the movement of the give 13, the hydraulic pump 5 is set at medium pressure or low pressure.
1 can be reduced to cope with energy saving.

In the above-described embodiment, a hydraulic circuit having a hydraulic cylinder is used as the moving means of the give 13, but other moving means such as a servomotor and an air cylinder may be used.

In the above embodiment, the load detecting means is a load meter based on oil pressure detection. However, a load meter based on a strain gauge may be used. Further, instead of the load detecting means, a frame deformation detecting means, for example, a control for detecting the deformation amount of the frame 2 due to the pressing load using a scale and controlling the moving amount of the gib 13 in accordance with the deformation amount. There is no harm in switching to the means.

Instead of the gib moving amount control means having the load detecting means or the frame deformation detecting means, the gib moving amount for measuring the precision of the product after the press working and controlling the gib moving amount based on the product accuracy is measured. Control means can also be used.

[0042]

According to the first aspect of the present invention, since the gib is provided so as to be movable in the front-rear direction, the gib moving means, and the gib moving amount control means, the C frame press is provided. Even if the opening phenomenon occurs, the parallelism of the slide can be accurately maintained without reinforcing the structural member. Further, by controlling the moving amount of the give, it is possible to cope with different pressing operations, that is, different opening amounts.

According to the second aspect of the present invention, the gib moving means is a gib correction device including a hydraulic cylinder having a rod connected to the gib and a hydraulic circuit for operating the hydraulic cylinder. In addition to the effects described above, the force required for the movement of the give can be sufficiently output, and the minute movement can be controlled, so that an inexpensive give movement means having a simple structure can be obtained.

According to a third aspect of the present invention, the gib movement amount control means includes a press load detecting means and is a gib correction device for converting the detected press load into a corresponding gib movement amount. In addition to the effects of the invention, the slide correction can be maintained with high precision by automating the give correction.

According to a fourth aspect of the present invention, the give movement control means is a give correction device which includes a frame deformation detecting means and converts the detected deformation of the frame into a corresponding give movement. In addition to the effects of the first or second aspect, the present invention can automate the give correction and maintain the slide parallelism with high accuracy.

According to a fifth aspect of the present invention, the give movement control means includes a press load detecting means for storing a change in the press load during one cycle of the press for one cycle or a plurality of cycles, and corresponding to the stored press load. In addition to the effects of the invention of claim 1 or 2, since the present invention is a gib correction device for converting to a gib correction amount, when the number of slide strokes is high and the press load in one press cycle changes. Also, the give correction can be automatically performed.

According to a sixth aspect of the present invention, the giving movement amount control means includes a frame deformation amount detecting means for detecting the deformation amount of the frame due to the press work, and the change in the deformation amount of the frame during one cycle of the press is performed for one cycle. Alternatively, since the present invention is a gib correction device that stores a plurality of cycles and converts the amount of deformation of the stored frame into a corresponding gib correction amount, the number of slide strokes is high in addition to the effect of the invention of claim 1 or 2, In addition, even when the amount of deformation of the frame during one cycle of the press changes, the give correction can be automatically performed.

According to a seventh aspect of the present invention, the gib movement amount control means includes a product accuracy measuring device and is a gib correction device for converting a measured value to a gib correction amount.
Alternatively, in addition to the effects of the second aspect, by performing the product-oriented give correction in this way, the accuracy of the product can be stabilized, and the production management can be rationalized.

[Brief description of the drawings]

FIG. 1 is an overall front view of a C frame press.

FIG. 2 is an overall side view of a C frame press.

FIG. 3 is a detailed view of a main part of a give correction mechanism.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a hydraulic circuit diagram according to the embodiment of the present invention.

FIG. 6 is a configuration diagram of a controller according to an embodiment of the present invention.

FIG. 7 is a control block diagram according to the embodiment of the present invention.

FIG. 8 is a side view showing the opening phenomenon of the C frame press.

[Explanation of symbols]

1 is a press machine, 2 is a frame, 3 is a bolster, 4 is a slide, 5 is a gib correction mechanism, 6 is a connecting rod, 7 is a coupling mechanism, 8 is a crankshaft, 9 is an upper pin, 10 is a lower pin, 11 Is a hydraulic cylinder, 12 is a rod, 13 is a give, 13A is a connecting portion, 14 is a position sensor, 15A, 15
B is an oil port, 80 is a controller, 81 is a PIO device, 8
2 is an MPU, 83 is a D / A converter, 84 is an A / D converter, and 85 is an A / D converter.

Claims (7)

[Claims] In a C frame press, a gib movably provided in a front-rear direction, a gib moving means for moving the gib, and a gib moving amount control means for controlling a moving amount of the gib are provided. A give correction device characterized by the above-mentioned. 2. The give correction device according to claim 1, wherein said give moving means comprises a hydraulic cylinder connecting a rod to said give, and a hydraulic circuit for operating said hydraulic cylinder. 3. The apparatus according to claim 1, wherein said giving movement amount control means includes a pressing load detecting means, and converts the giving movement amount into a giving movement amount corresponding to the pressing load value detected by said pressing load detecting means. 2 Give correction device. 4. The apparatus according to claim 1, wherein said moving amount control means includes a frame deformation detecting means for detecting a deformation amount of the frame due to the pressing operation, and a giving movement corresponding to the deformation amount of the frame detected by said frame deformation detecting means. 3. The gibbing correction device according to claim 1, wherein the gibbing correction device converts the amount into a quantity. 5. The apparatus according to claim 1, further comprising a press load detecting means for storing a change in the press load during one cycle of the press for one cycle or a plurality of cycles, and for providing a give corresponding to the stored press load value. 3. The gibbing correction device according to claim 1, wherein the gibbing correction device converts the correction value into a correction amount. 6. The apparatus according to claim 1, wherein the giving movement amount control means includes a frame deformation amount detecting means for detecting a deformation amount of the frame due to the press work, and a change in the deformation amount of the frame during one cycle of the press for one cycle or a plurality of cycles. Remember,
3. The gibbing correction device according to claim 1, wherein the gibbing correction amount is converted into a gibbing correction amount corresponding to the stored deformation amount of the frame. 7. The apparatus according to claim 1, wherein said giving movement amount control means includes a product accuracy measuring device for a product by press working, and converts a measurement value detected by said product accuracy measuring device into a giving correction amount. 1 or 2 give correction device.