JPH07246431A - Control method of punch press machine - Google Patents

Abstract

PURPOSE:To obtain a control method of a punch press machine which can machine with low noise, obtains a high productivity without generating pressing marks of a stripper on a work's surface. CONSTITUTION:A controller part 22 calculates the pressing force of a stripper 8 and the stroke patterns of a punch 7 and the stripper 8 from the thickness and material informations of a work inputted from an automatic programing system 23, a punching load information of a punch 7 and a machining velocity mode information set by an operation stand 24. Then, this calculated result is outputted to a punch servo valve 12, a spool controlling servo valve 14, a change-over switching valve 18 and a stripper servo valve 20 to individually move up and down the punch 7 and the stripper 8, thus to perform punching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press control method provided with a punch and a die for punching a work, and a stripper for holding the work when the punch is raised.

[0002]

2. Description of the Related Art Conventionally, in a punch press machine such as a turret punch press, a punching work is performed by the punch and the die while the work on the die is pressed by a stripper descending together with the punch. Has become.

By the way, in such a punch press, a punch stroke is controlled according to punching load, plate thickness information and the like in order to reduce punch noise and processing time. There are various proposals as shown in. [Patent Document 1] Japanese Patent Application Laid-Open No. 1-148499 SUMMARY OF THE INVENTION A high-efficiency machining stroke pattern with low vibration and low noise is automatically generated from a punching load calculated from a material of a workpiece, a sheet thickness and a punching circumference and sheet thickness information. Stroke control method for press machine. [Patent Document 1] Japanese Patent Application Laid-Open No. 4-84699 A control method of a hydraulic press drive device of a punch press machine, which controls a press with a necessary minimum stroke based on information on a plate thickness and a shear angle to improve productivity. [Patent Document 1] Japanese Patent Application Laid-Open No. 4-270015 SUMMARY OF THE INVENTION A predetermined item is calculated from the plate thickness and material, the calculation result is transferred to a digital servo controller, and this controller sends a drive command according to a punch program generated from data to a punch drive actuator. Punch press control device designed to output.

[0004]

However, in the systems disclosed in the above-mentioned respective publications, since the stroke control of the punch is merely performed and the pressure control and the stroke control of the stripper are not performed, The problem of indentation on the surface of the work cannot be solved by the stripper, and the structure in which the stripper is integrated with the punch via the disc spring has a limit to the reduction of punch noise. Since the punch is moved up and down in conjunction with the up and down movement, there is a problem that there is a limit in reducing the processing time.

Further, in the devices disclosed in the above-mentioned publications, the vertical movement of the ram connected to the punch is controlled by the hydraulic pressure from a single hydraulic pressure source regardless of the magnitude of the punching load. There is also a problem that a hydraulic power source is required and efficient machining cannot be performed.

The present invention has been made in order to solve the above-mentioned problems, and is capable of performing low-noise machining and high productivity, and moreover, a punch which does not cause an indentation of the stripper on the work surface. An object is to provide a control method for a press machine. It is another object of the present invention to provide a method of controlling a punch press machine that can perform highly efficient processing.

[0007]

In order to achieve the above-mentioned object, a method of controlling a punch press machine according to the present invention is a punch including a punch and a die for punching a work, and a stripper for holding the work when the punch is raised. In the press machine, the work thickness, material information, and these thickness,
Punching load information of the punch calculated from material information,
From the preset processing speed mode information, the pressing force of the stripper and the stroke pattern of the stripper and the punch are respectively calculated, and the stripper and the punch are controlled based on the calculation result. It is a thing.

Here, it is preferable that the processing speed mode can be set to any one of a low speed mode, a normal mode and a high speed mode. In this case, in the high speed mode, it is preferable that the stripper be held at a position separated from the work by a minute distance during the machining, and in the low speed mode and the normal mode, the stripper be in contact with the work during the machining.

Further, in the present invention, a prefill valve for switching the hydraulic pressure to be supplied from the tank to the cylinder chamber of the punch driving cylinder when the punch is operated at a low load and at a high speed is provided. It is preferable to control the valve so that the punching load of the punch is switched when the punching load is equal to or more than a specified value and is not switched when the punching load is less than the specified value.

In this case, when the prefill valve is switched, or even when the prefill valve is not switched, the machining speed mode is the low speed mode, the stroke pattern of the punch is the polygonal line of the punch position with respect to time. It is better to set it so that it changes into a shape.
Further, when the prefill valve is not switched and the machining speed mode is the normal mode or the high speed mode, it is preferable to set the punch stroke pattern so that the punch position with respect to time changes into a sine wave shape. .

In the present invention, a punch driving cylinder,
It is preferable that hydraulic pressure be supplied to the stripper driving cylinder and the spool of the prefill valve via respective hydraulic servo valves, and these hydraulic servo valves be controlled by signals from respective servo amplifiers.

[0012]

In the present invention, the plate thickness and material information of the work, the punching load information calculated from the plate thickness and material information, and the preset machining such as low speed mode, normal mode and high speed mode The pressing force of the stripper and the stroke patterns of the stripper and the punch are calculated from the speed mode information, and the stripper and the punch are controlled based on the calculation result.
In this way, it is possible to limit the acceleration of the stripper to a predetermined value when punching a workpiece, which reduces noise during punching and
By changing the pressure applied to the stripper, it is possible to prevent the occurrence of indentations on the surface of the work. Also, set the timing of contact and release of the stripper with respect to the work, or perform processing without contacting the stripper with the work. By setting, it becomes possible to improve productivity.

Here, when the machining speed mode is set to the high speed mode, the stripper is held at a position separated from the work by a minute distance during the machining, and when the low speed mode and the normal mode are set, the stripper contacts the work during machining. To be done. As a result, the high speed mode is selected when the productivity is emphasized, and the low speed mode or the normal mode is selected when the low noise is emphasized rather than the productivity.

Further, in the present invention, when the punch is operated at a low load and at a high speed, a prefill valve for switching the hydraulic pressure supplied to the cylinder chamber of the punch driving cylinder to be supplied from the tank is provided. If the punching load of the punch is over the specified value and the switching operation is controlled, and if the punching load is below the specified value, the switching operation is not performed, and the punch can be switched to the low load high speed mode or the high load low speed mode in a timely manner. It is possible to perform good processing.

Most preferably, the stroke pattern of the punch is a pattern that increases the speed at the end of the punching process, that is, a pattern in which the punch position changes linearly with time. This polygonal line pattern is preferably applied in the low speed mode. The gear shift at the inflection point of the polygonal line pattern does not cause any problem because the punch speed is low. Further, in the high-speed mode, by changing the punch stroke pattern to the sine wave shape instead of the polygonal line shape, the inflection point (the bent portion of the polygonal line) is eliminated and rapid acceleration / deceleration is eliminated, so that the followability is improved. be able to.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a control method for a punch press machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a punch press machine according to an embodiment of the present invention. As shown in the figure, in the punch press of the present embodiment, a lower frame 1a having a lower part integrated with a base and an upper frame 1b fixed to the upper part of the lower frame 1a form an annular shape (O). The punch frame 1 formed into a shape is provided. A processing center 2 is arranged at a position slightly deviated to one side from the center of the punch frame 1 in the longitudinal direction with an axis line set in the vertical direction. A movable table 3 is arranged inside the punch frame 1 so as to intersect with the punch frame 1. And
An XY carriage 4 which is movable along the upper surface of the lower frame 1a in the X-axis direction (the direction perpendicular to the paper surface) and the Y-axis direction (the left-right direction in FIG. 1) is arranged on one side of the moving table 3. A clamp 6 that holds a plate-shaped work 5 is attached to the XY carriage 4. In this way, the workpiece 5 to be machined is grasped by the clamp 6, positioned in the X-axis direction and the Y-axis direction by the XY carriage 4, and automatically fed to the punching work position of the machining center 2.

As shown in FIG. 2, in the processing center 2, a punch (upper die) 7 on the upper frame 1b side and a stripper (plate retainer) 8 fitted on the outer shape of the punch 7 are provided.
Are attached, and a die (lower die) 9 is attached to the lower frame 1a side so as to face the punch 7 and the stripper 8. These punch 7, stripper 8 and die 9
Is taken out from a mold magazine (not shown) which is arranged with the axis parallel to the punch frame 1 in the set state,
Transferred to the processing center 2 position for replacement. The punch 7, the stripper 8 and the die 9 are the processing center 2
When the punch 7 is mounted on the stripper 8, the punch 7 is moved up and down by the operation of the punch driving servo cylinder 10, and the stripper 8 is moved.
Is moved up and down separately from the punch 7 by the operation of the servo cylinder 11 for driving the stripper.

The punch driving servo cylinder 10 is provided with a piston 10a for moving the punch 7 up and down. The piston 10a causes the inside of the cylinder to move upward from the first chamber 10b, the second chamber 10c and the third chamber 10d. It is divided into three rooms. The hydraulic pressure discharged from the hydraulic pressure source P is supplied to the first chamber 10b through the electromagnetically operated punch servo valve 12 and the prefill valve 13, and the hydraulic pressure source is supplied to the second chamber 10c and the third chamber 10d. Hydraulic pressure is supplied from P via the punch servo valve 12.

The prefill valve 13 has a structure in which a spool 13b is provided in a valve body 13a which is integral with the punch driving servo cylinder 10. The spool 13b is connected to the valve body 1 from the spool control servo valve 14.
Operated by pilot pressure supplied to pilot chambers 13c and 13d provided at both ends of 3a, the punch servo valve 12 communicates with the first chamber 10b of the punch driving servo cylinder 10 or the first chamber 10b communicates with the tank 15. Here, atmospheric pressure is introduced into the tank 15 from the pipe line 15a.

On the other hand, the stripper driving servo cylinder 11 has a piston 11 for moving the stripper 8 up and down.
a is provided, and the inside of the cylinder is partitioned by the piston 11a into an upper chamber 11b and a lower chamber 11c. The hydraulic pressure discharged from the hydraulic pressure source P is supplied to the upper chamber 11b and the lower chamber 11c by a high pressure reducing valve 16, a low pressure reducing valve 17, an electromagnetically operated switching valve 18, a check valve 19 and an electromagnetically operated stripper servo. It is supplied via the valve 20. In addition, what is indicated by the reference numeral 21 in FIG. 2 is an accumulator.

The punch servo valve 12, the spool control servo valve 14, and the stripper servo valve 2
0 and the switching valve 18 are operated by a control signal from the controller unit 22. In order to calculate this control signal, program data from the automatic programming system (CAD, CAM) 23 and press mode setting data set by the selection switch of the operation panel 24 are stored in the controller unit 22 as a data input unit (not shown). ). Here, the data input from the automatic programming system 23 is used mold shape (perimeter, shear angle,
(Clearance), punching load, work plate thickness, material, and data set by the operation panel 24 is data for selecting the press mode from the low speed mode, the normal mode, and the high speed mode. .

The controller unit 22 has a central processing unit (CPU) 22a for executing a predetermined program, a read-only memory (ROM) 22b for storing this program and various tables, and a working necessary for executing this program. Writable memory as memory (RA
M) 22c, and axis control circuits 25a, 25b, 25c and a servo amplifier 26 for controlling the punch servo valve 12, the spool control servo valve 14 and the stripper servo valve 20, respectively.
a, 26b, 26c.

Next, each of the high / low pressure switching control of the stripper 8, the stripper 8 axis control, the punch 7 axis control, and the prefill valve 13 switching control will be described.

(1) High / Low Pressure Switching Control of Stripper 8 Based on each input data of work material, cutting circumference and plate thickness inputted from the automatic programming system 23,
The controller unit 22 selects the pressure and selects the switching valve 1
8 outputs a selection signal for switching the hydraulic pressure supplied to the stripper servo valve 20 between high pressure and low pressure. Switching valve 1
8 is operated, the high pressure reducing valve 16 or the low pressure reducing valve 1
Any one of 7 is selected. In this way, the stripper pressure is set according to the material of the work, and it is possible to obtain a product with excellent appearance quality without indentation.

(2) Axis control of the stripper 8 (stroke pattern, stroke position control) The die shape used (perimeter, shear angle, clearance), punching load, input from the automatic programming system 23,
Based on the input data of the plate thickness and the material of the work, the controller unit 22 selects the mold in the mold magazine and calculates the stroke position of the punch 7 in consideration of the punch height of the selected mold. Then, the controller unit 22 selects the stroke pattern of the stripper 8 (whether or not to contact the work during punching) by a press mode selection signal (low speed machining, normal machining, high speed machining) input from the operation panel 24. Then, the stroke position of the stripper 8 is calculated and the command value is output to the axis control circuit 25a. The axis control circuit 25a operates the stripper servo valve 20 through the servo pump 26a. Stripper 8
The stroke position is set independently of the punch position, and the acceleration of the stripper is limited to a predetermined value, so that it is possible to reduce the processing time and noise.

(3) Axis control of the punch 7 (stroke pattern, stroke position control) Based on the punching load calculated from each input data from the automatic programming system 23 and the press mode selection signal input from the operation panel 24. , The controller unit 22
The stroke pattern of the punch 7 is selected to be a polygonal line pattern or a sine waveform pattern, which will be described later, and the stroke position of the punch 7 is calculated from the data of the plate thickness of the work, the material, and the shear angle of the die to control the axis control circuit. The command value is output to 25b. Then, the axis control circuit 25b uses the servo amplifier 2
The punch servo valve 12 is operated via 6b.

(4) Switching control of the prefill valve 13 When the switching operation of the prefill valve 13 is selected based on the punching load calculated from each input data from the automatic programming system 23, the switching operation is performed. Is
The switching timing is determined from the inflection point of the broken line pattern of the stroke pattern of the punch 7, and the command value is output to the axis control circuit 25c. The axis control circuit 25c operates the spool control servo valve 14 via the servo amplifier 26c.

In this prefill valve 13, when the punch 7 is operated at a low load and a high speed, the spool 13b is in the position shown in FIG. 3 and the tank 15 and the first chamber 10b are in communication with each other. A large amount of oil in 15 flows into the first chamber 10b, and the piston 10a is lowered at a high speed. On the other hand, when the punch 7 is operated with a high load, the spool 13b is switched to the position shown in FIG. 4 by the pilot pressure, and the piston 10a moves in the first chamber 1
0b and the hydraulic pressure supplied to the second chamber 10c lower the workpiece 5 with a large force to punch the workpiece 5. By controlling the switching of the prefill valve 13 in this manner, the punch 7 can be switched to the low-load high-speed mode or the high-load low-speed mode in a timely manner, and efficient machining can be performed.

Next, operation modes of the punch 7 and the stripper 8 in this embodiment will be described with reference to FIGS. In these figures, (a) and (b)
(C) shows punch 7 and stripper 8 according to the passage of time
6D shows the positional relationship between the punch 7 and the stripper 8 along with the passage of time, together with the pattern of the prefill valve 13 in a diagram.

(1) Low Speed Mode (FIG. 5) In the low speed mode, first, the stripper 8 is lowered from the standby point b at the speed V1 and at the same time the punch 7 is moved from the standby point a above the standby point b to the speed V2 ( > V1), it is lowered to the waiting point c below the waiting point b. Next, the punch 7 waits at the waiting point c until the stripper 8 contacts the work 5, and after the stripper 8 contacts the work 5, the punch 7 is at the speed V1 until the point e, and then the point g (bottom point). Up to the speed V2, and punching by the punch 7 is executed. After punching, the punch 7 is moved up from the point g to the standby point a at a speed V2, and immediately after the punch 7 is separated from the work 5, the stripper 8 is moved up to the standby point b at a speed V2. In this low-speed mode, the punch 7 and the stripper 8 are both brought into contact with the work 5 at a small speed (V1), so that breakthrough noise can be reduced and the pressing force of the stripper 8 can make an impression on the surface of the work 5. Can be kept small. Further, since the stripper 8 is brought into contact with the work 5 immediately before the punch 7 comes into contact with the work 5, and the stripper 8 is taken out from the work 5 immediately after the punch 7 is taken out of the work 5, the conventional punch-stripper is used. Processing time can be shortened and productivity can be improved as compared with the integrated type.
In addition, in FIG. 5, reference numeral 27 indicates a punched residue.

(2) Normal mode (FIG. 6) When the punching load is small, as shown in FIG. 6 (A), the stripper 8 moves to the standby point b before punching by the punch 7 as in the low speed mode. To the position where it abuts against the workpiece 5 at a speed V1 and after punching at a speed V1 to a standby point b. On the other hand, the punch 7 draws a sine waveform from the standby point a, is lowered to the lowest point g, and is then raised so as to return to the standby point a and punching is performed. Further, when the punching load is large, as shown in FIG. 6B, the punching process is executed in the same pattern as in the low speed mode.

(3) High speed mode (FIG. 7) When the punching load is small, as shown in FIG. 7 (A), the stripper 8 moves from the standby point b to the speed V2 before punching by the punch 7. It is lowered to the waiting point c, and after punching,
The speed is raised to the standby point b at the speed V2. Meanwhile, punch 7
Draws a sine waveform from the standby point a, is lowered to the lowest point g, and is then raised so as to return to the standby point a and punching is executed. In this case, the sine waveform has a shape that substantially overlaps the falling straight line and the rising straight line of the stripper 8. When the punching load is large, the stripper 8 moves from the standby point b to the standby point c at the speed V2 as shown in FIG. 7 (B).
At the same time, the punch 7 is lowered from the standby point a to the standby point c at the speed V2. Then the stripper 8
While waiting at the waiting point c, the punch 7 is lowered at the speed V1 up to the point e and then at the speed V2 up to the point g, and punching by the punch 7 is executed. After punching, the punch 7 is moved up from the point g to the waiting point a at a speed V2, and the stripper 8 is moved up to the waiting point b at a speed V2 following the rising of the punch 7. In this high speed mode, the stripper 8 is moved a minute distance from the work 5 (for example, 0.
The work 5 is punched out at positions separated by 5 mm), that is, held at the standby point c, and the work 5 is moved, so that the machining time can be further shortened. This high-speed mode is an effective operation mode when priority is given to improving productivity and minimizing the indentation on the surface of the work 5 rather than reducing noise.

In this embodiment, the control of the punch 7 and the stripper 8 by the controller unit 22 is performed according to the flow shown in FIG. This flow will be described next.

S1: The data of the plate thickness, the material, the circumference of the mold and the shear angle are read from the program input from the automatic programming system 23, and the speed mode (low speed mode, normal mode) of the selector switch of the operation panel 24 is read. , High speed mode) is recognized.

S2 to S9: These steps are steps for determining the punch stroke pattern,
First, the punching load is calculated (S2), and it is determined whether the calculated punching load is a specified value (threshold value) or more (S3).
When the punching load is equal to or greater than the specified value, the prefill valve 13 is switched (S4), and the stroke pattern of the punch 7 is as shown in FIGS. 5, 6 (B) and 7 (B). The polygonal line pattern is set (S5). On the other hand, when the punching load is less than the specified value, it is assumed that the prefill valve 13 is not switched (S6). In this case, it is determined whether the mode is the low speed mode (S7). (S8), and when not in the low speed mode, in other words, in the normal mode or the high speed mode, the sine waveform pattern is set (S8).
9).

S10 to S19: These steps are steps for determining the stripper stroke pattern. First, it is determined whether the stripper pressure is high pressure or low pressure from the chart of work material and allowable surface pressure (S10). First, it is determined whether the stripper pressure is high pressure designation (S1).
1). When the high pressure is designated, the stripper pressure is set to the high pressure (S12), and then it is determined whether the press mode setting data is set to the high speed mode (S1).
3) When the high speed mode is set, select a machining pattern that does not allow the stripper to contact the work (S1
4) If the mode is not the high speed mode, in other words, the low speed mode or the normal mode, the processing pattern for bringing the stripper into contact with the work is selected (S15). On the other hand, when the stripper pressure is not the high pressure designation, the stripper pressure is set to the low pressure (S16), and then it is determined whether the press mode setting data is set to the high speed mode (S1).
7) When the high speed mode is set, select a machining pattern in which the stripper is not brought into contact with the work (S1).
8) If the mode is not the high speed mode, in other words, the low speed mode or the normal mode, the processing pattern for bringing the stripper into contact with the work is selected (S19).

S20 to S23: When the stroke pattern of the punch 7 and the stroke pattern of the stripper 8 are determined by the above steps, the operating speed of the punch 7 and the stripper 8 according to each speed mode is determined (S2
0), then determine the operating positions of the punch 7 and the stripper 8 according to the plate thickness of the work (S21), and further control waveforms with mutual timing of switching the punch 7, the stripper 8 and the prefill valve 13 (S2
2), processing is executed (S23).

[0039]

As described above, according to the present invention, low noise machining can be performed and high productivity can be obtained.
In addition, the problem of the indentation of the stripper on the surface of the work can be solved and the appearance quality can be improved. Further, in the present invention, when a pre-fill valve for switching the hydraulic pressure to be supplied to the cylinder chamber of the punch driving cylinder is supplied from the tank when the punch is operated at a low load and a high speed, the punch is operated in a low load and high speed mode. Alternatively, it is possible to switch to the high load low speed mode in a timely manner and perform efficient machining. Further, by selecting the processing speed mode, it is possible to meet the respective needs when productivity is important and when low noise is important.

[Brief description of drawings]

FIG. 1 is a front view of a punch press machine according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control system according to this embodiment.

FIG. 3 is an operation explanatory view of the prefill valve in the present embodiment.

FIG. 4 is an operation explanatory view of the prefill valve in the present embodiment.

FIG. 5 is an operation explanatory diagram of a low speed mode of the present embodiment.

FIG. 6 is an operation explanatory diagram of a normal mode of the present embodiment.

FIG. 7 is an operation explanatory view in the high speed mode of the present embodiment.

FIG. 8 is a flowchart showing a control flow of punches and strippers in the present embodiment.

[Explanation of symbols]

 2 Processing Center 5 Work 7 Punch 8 Stripper 9 Die 10 Punch Drive Servo Cylinder 11 Stripper Drive Servo Cylinder 12 Punch Servo Valve 13 Prefill Valve 14 Spool Control Servo Valve 15 Tank 16 High Pressure Regulator Valve 17 Low Pressure Regulator Valve 18 Switching Valve 20 Servo valve for stripper 22 Controller 23 Automatic programming system 24 Operation panel 25a, 25b, 25c Axis control circuit 26a, 26b, 26c Servo amplifier

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B30B 15/16 C 8718-4E 15/22 B 8718-4E

Claims (7)

[Claims] 1. A punch and a die for punching a work,
In a punch press equipped with a stripper for holding a work when the punch is raised, work thickness, material information, punching load information of the punch calculated from these thickness and material information, and preset machining Control of the punch press machine characterized in that the pressing force of the stripper and the stroke pattern of the stripper and the punch are respectively calculated from the speed mode information, and the stripper and the punch are controlled based on the calculation result. Method. 2. The method for controlling a punch press machine according to claim 1, wherein the processing speed mode can be set to any one of a low speed mode, a normal mode and a high speed mode. 3. The stripper is held at a position slightly apart from the work during machining in the high speed mode, and the stripper contacts the work during machining in the low speed mode and the normal mode. Control method of punch press machine. 4. A prefill valve is provided for switching operation so that hydraulic pressure supplied to a cylinder chamber of a punch driving cylinder is supplied from a tank when the punch is operated at a low load and a high speed. 4. The method of controlling a punch press according to claim 1, wherein when the punching load of the punch is a specified value or more, the switching operation is performed, and when the punching load is less than the specified value, the switching operation is not performed. 5. When the prefill valve is switched, or when the processing speed mode is the low speed mode even when the prefill valve is not switched, the stroke pattern of the punch is a punch pattern with respect to time. The control method of the punch press machine according to claim 4, wherein the position is set so as to change in a polygonal line shape. 6. When the prefill valve is not switched and the machining speed mode is the normal mode or the high speed mode, the punch stroke pattern is such that the punch position with respect to time changes into a sine wave shape. The method for controlling a punch press machine according to claim 4, wherein the method is set to. 7. A punch driving cylinder, a stripper driving cylinder, and a spool of a prefill valve are supplied with hydraulic pressure via respective hydraulic servo valves, and these hydraulic servo valves are controlled by signals from respective servo amplifiers. The method for controlling a punch press machine according to any one of claims 1 to 6.