JPH05131297A - Hydraulic press - Google Patents

Abstract

PURPOSE:To prevent the interference and to shorten the working time together by reading the next line of a working program in advance, judging the interference of the work holder with the hydraulic pressure head and controlling the timing of the lowering start of the hydraulic pressure head. CONSTITUTION:A controlling device 30 of the subject press is composed of respective controllers of a CNC31 for controlling the work movement, a MMC32 for controlling the treatment operation, a PMC33 for controlling the hydraulic pressure and the turret driving and a DSC36 for controlling the hydraulic cylinder servo. The controlling device 30 reads the next line of a program during working in advance, and judges whether the work holder 43 interferes with the hydraulic pressure head 41 or not on the step. Based on the judged result, the signal from respective controllers is controlled as follows. That is, when not interference is judged, the lowering of the hydraulic pressure head 41 is started simultaneously with the moving start of the work holder. And when pressure of interference is judged, the lowering of the hydraulic pressure head 41 is started after the movement of the work holder 43 is finished. Therefore, the press working is progressed while avoiding the interference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press, and more particularly to a hydraulic press provided with a work holder for holding a plate material and a hydraulic head for processing the held plate material.

[0002]

2. Description of the Related Art In recent years, as a turret punch press machine for punching and drawing a plate material, a hydraulic drive type machine using a hydraulic cylinder as a drive source has been used. In the punch press machine, the hit rate of the die is extremely high, such as several hundreds per minute, so that the punch press machine is conventionally limited to the crank type machine using a motor as a drive source. However, due to improvements in the hydraulic system, high-speed operation has become possible, and hydraulic punch press machines have been used.

In this type of hydraulic punch press, since the stroke amount of the hydraulic cylinder can be adjusted, the stroke amount is minimized to improve the hit rate, and machining is performed in the same cycle as the crank type. be able to. For example, the stroke can be minimized by raising the tool to the top dead center only when exchanging the tool, and otherwise making the tool stand by at the lowest allowable level.

[0004]

In the hydraulic punch press machine, when the press working is performed while the stroke is minimized, the gap between the lower surface of the tool and the table becomes smaller than that of the crank type machine. .. Therefore, there is a problem of interference between the work holder that holds the plate material and the tool that engages with the tip of the hydraulic cylinder. That is, when the gap becomes small,
Since the lower surface of the tool is located below the upper surface of the work holder, the work holder may come into contact with the tool.

In order to solve this problem, it is conceivable to detect whether or not the work holder interferes with the tool during movement of the tool by the work holder, and change the stroke of the hydraulic cylinder when this is detected. .. However, if the interference of the work holder is detected or the stroke of the hydraulic cylinder is changed during the movement, various control routines are required for that purpose and the machining time becomes long.

An object of the present invention is to shorten the processing time and prevent the work holder from interfering with the hydraulic head.

[0007]

A hydraulic press according to the present invention comprises a work holder for gripping a plate material, a hydraulic head for machining the gripped plate material, a pre-reading means, and an interference determining means.
And a control means. The pre-reading means pre-reads the line next to the line being processed in the machining program including a plurality of lines. The interference determination means determines the interference between the work holder and the hydraulic head based on the pre-reading result of the pre-reading means. The control means is
The descent start timing of the hydraulic head is controlled based on the determination result of the interference determination means.

[0008]

In the hydraulic press according to the present invention, the plate material is held by the work holder, and the held plate material is processed by the hydraulic head. On the other hand, the pre-reading means pre-reads the next row of the current row being processed, and the interference determining means determines the interference between the work holder and the hydraulic head based on the pre-reading result. Then, the control means controls the descent start timing of the hydraulic head based on the determination result of the interference determination means. For example, when the hydraulic head is placed in a standby position at which no interference occurs, and when the interference determination means determines that there is no interference, the hydraulic head is lowered from the standby position when the work holder starts moving, and the hydraulic head is lowered. And the work holder are moved at the same time. As a result, the hydraulic head can be lowered while the work holder is moving, and the processing time can be shortened. When it is determined that the interference occurs, the hydraulic head starts to descend from the standby position after the movement of the work holder is completed. This does not cause interference.

[0009]

1 and 2 show a hydraulic punch press which is a hydraulic press according to an embodiment of the present invention. Here, a turret punch press machine is taken as an example. The punch press machine 1 is mainly composed of a lower frame 2, an upper frame 3 arranged above the lower frame 2, and a throat portion 4 for supporting the upper frame 3 at the rear. A fixed table 10 is arranged in the center of the upper surface of the lower frame 2. A pair of guide rails 5 and 6 are arranged on both sides of the upper surface of the lower frame 2. Guide rail 5,
A carriage 7 is disposed on the carriage 6 so as to be movable in the depth direction (Y-axis direction). Moving tables 8 and 9 arranged on both sides of the fixed table 10 are fixed to the carriage 7. The carriage 7 is provided with a cross slide 15 to which a pair of work holders 13 and 14 for arranging the plate material 11 are attached so as to be movable in the left-right direction (X-axis direction).

A moving mechanism for moving the carriage 7 in the Y-axis direction is arranged below the moving table 10. The moving mechanism includes a servo motor 16, a ball screw 17 connected to the servo motor 16, and a ball nut 18 screwed to the ball screw 17. The ball nut 18
It is fixed to the lower surface of the moving table 9. On the other hand, a moving mechanism that moves the cross slide 15 in the X-axis direction is arranged inside the carriage 7. The moving mechanism is composed of a servo motor 20 arranged at one end of the carriage 7, a ball screw 21 connected to the servo motor 20, and a ball nut 23 screwed onto the ball screw 21. The ball nut 23 is fixed to the cross slide 15.

The upper frame 3 is rotatably provided with an upper turret 12 for accommodating a plurality of punches. Inside the upper turret 12, there is provided a punch head which moves up and down by a hydraulic cylinder (FIG. 3). On the other hand, on the lower frame 2 side, a lower turret 22 that houses a plurality of dies is arranged to face the upper turret 12. Further, the processing unit 24 is configured by the punch and die at the processing position, the hydraulic cylinder, and the like.

A control device 30 is provided in the throat section 4 as shown in FIG. The control device 30 includes a CNC 31, MMC 32, and PMC as controllers.
33 is provided. Data is transmitted and received at high speed between the controllers via a window. The CNC 31 controls the servomotors 16 and 20 for moving the plate material 11 in the X-axis direction and the Y-axis direction, and includes a CPU, a ROM, a RAM, and the like. The MMC 32 is capable of performing various processes using a high-level language, and includes a CPU, ROM, RAM and the like. The MMC 32 prefetches the contents of the next line during machining of the machining program, and from the prefetched contents,
It is determined whether or not the work holders 13 and 14 and the processing section 24 interfere with each other. This determination is performed, for example, by determining whether or not the locus connecting the machining position in the content of the prefetched step and the machining position of the previous step is near the coordinates of the tip positions of the work holders 13 and 14. PMC33 is
It controls hydraulic pressure and turret drive, and includes a CPU, a ROM, a RAM, and the like.

DSC for MMC32 and PMC33
A (digital servo controller) 36 is connected. The DSC 36 is a controller for servo-controlling the position and speed of the hydraulic cylinder 40.
2 and a speed command to the speed control unit 38 according to the position information and the speed information given from the PMC 33. The speed control unit 38 is for feedback-controlling the processing speed of the processing unit 24 (the ascending / descending speed of the cylinder 40) according to the speed command given from the DSC 36, and is composed of a speed amplifier and an integrating circuit. .. In addition, PMC35
A pressure control unit 50 is connected to. Pressure control unit 50
Is for controlling the pressure of the hydraulic cylinder 40.

A hydraulic cylinder 40 is arranged above and below the processing position. An engagement portion 42 with which the head of a punch 41 forming the processing portion 24 can be engaged is attached to the tip of the piston rod of the hydraulic cylinder 40. An electrohydraulic 4-port 3-position servo valve 44 is connected to the hydraulic cylinder 40. The spool of the servo valve 44 is provided with a servo control coil 45 and a feedback detector 46. In the servo control coil 45,
A control signal from the speed control unit 38 is input. Further, the detection signal of the feedback detector 46 is input to the speed control unit 38, and the movement amount of the spool is feedback-controlled by the speed control unit 38. This allows
The flow rate passing through the servo valve 44 is controlled, and the ascending / descending speed of the hydraulic cylinder 40 is controlled. Also,
The hydraulic cylinder 40 is provided with a position detector 47 that detects the position of the piston. The output of the position detector 47 is input to the DSC 36 via the A / D converter 48.

On the other hand, a pressure command is given from the PMC 33 to the pressure control unit 50. The pressure control unit 50 converts this into an electric signal and supplies it to the proportional electromagnetic relief valve 51. Further, the relief valve 51 is connected to a hydraulic circuit 54 including a pump 52 and a motor 53 that drives the pump 52. A hydraulic device 55 for controlling other actuators is connected to the hydraulic circuit 54. The hydraulic line of the hydraulic circuit 54 is connected to the servo valve 44.

As shown in FIG. 4, the MMC 32 is connected with a keyboard 34, a CRT 35, a host interface 37 for connection with a host computer, and other input / output units. An axis control unit 39 for controlling the X axis and the Y axis is connected to the CNC 31. Further, the PMC 33 has an upper turret 12 and a lower turret 2.
A turret drive unit 19 for driving the motor 2 and other input / output units are connected.

Next, the control operation of the control device 30 will be described based on the control flow chart shown in FIG. First, in step S1, initial settings such as movement to the origin of the table are performed. In step S2, for example, the machining program is read from the host computer via the host interface 37 and stored in the RAM in the CNC 31.
In step S3, the operator waits for a work start command.
When the work start command is input, the process proceeds to step S4.
In step S4, one step of the machining program is read. Then, in step S5, the next step of the machining program is read. The process in step S4 is performed by the CNC 31, and the process in step S5 is performed by the MMC32. In step S6, it is determined whether or not the contents of the step read in step S4 mean a machining command. In step S7, it is determined from the contents of the next step read in step S5 whether or not the work holders 13 and 14 and the processing section 24 interfere with each other in the next step. This judgment is made by the MMC 32 as described above,
It is determined whether or not the locus connecting the processing position of this step and the processing position of the next step is near the tip positions of the work holders 13 and 14.

In step S8, it is determined whether or not the contents read in step S4 mean another command. In step S9, it is determined whether or not the content of the read step means the end. If the determination in step S9 is yes, the process ends. If NO, the process returns to step S4. On the other hand, step S
If it is determined in step 6 that the instruction means machining, step S
Move to 10.

In step S10, a machining routine is executed. In this processing routine, as shown in FIG. 6, in step S21, it is determined whether or not the interference flag is set in step S11 described later. When it is determined that the interference flag is set (there is a risk of interference), the process proceeds to step S22. After step S22, the plate material 11 is first moved to a predetermined position, and the hydraulic head is driven after the positioning is completed.

That is, first, in step S22, the interference flag is reset. In step S23, the movement of the cross slide 15 and the carriage 7 is started, and the movement of the plate material 11 is started. In step S24, it waits until the processing position of the plate material 11 reaches a predetermined position. When the processing position of the plate material 11 reaches the predetermined position, the process proceeds to step S25. In step S25, the movement of the plate material 11 is stopped. In step S26, the hydraulic cylinder 40 starts to descend.
In step S27, it waits for the hydraulic cylinder 40 to reach the lower end. When the hydraulic cylinder 40 reaches the lower end, the process proceeds to step S28. In step S28, the descent is stopped. In step S29, raising of the hydraulic cylinder 40 is started. In step S30, it waits for the hydraulic cylinder 40 to reach the rising end. When the hydraulic cylinder 40 reaches the rising end, the process proceeds to step S31. Step S3
At 1, the hydraulic cylinder 40 stops rising. When the hydraulic cylinder 40 stops rising, the process returns to the main routine.

On the other hand, if it is determined in step S21 that the interference flag is not set (no risk of interference), the process proceeds to step S32. After step S32, the driving of the hydraulic head is started before the positioning of the plate material 11 is completed. That is, in step S32, the hydraulic cylinder 40 starts to descend and the plate material 11 starts to move. In step S33, it is determined whether the plate material 11 has reached a predetermined processing position, that is, whether positioning has been completed. When the positioning of the plate material 11 is not completed, the process proceeds to step S34. In step S34, it is determined whether the hydraulic cylinder 40 has reached a predetermined standby position. This standby position is set so that the tip of the punch tool is above the uppermost surface of the work holders 13 and 14 so that the punch tool that is descending during the movement of the plate material does not contact the work holders 13 and 14 or the plate material 11. It has become. When it is determined that the hydraulic cylinder 40 has not reached the standby position, the process returns to step S33. When it is determined that the hydraulic cylinder 40 has reached the standby position, the process proceeds to step S35. In step S35, the hydraulic cylinder 4
Stop the descent of 0. In step S36, the completion of positioning of the plate is waited for. When the positioning of the plate material 11 is completed, the process proceeds to step S37. In step S37, the hydraulic cylinder 40 is lowered again.

If it is determined in step S33 that the positioning of the plate 11 is completed, or if the process in step S37 is completed, the process proceeds to step S27 and waits for the hydraulic cylinder 40 to reach the lower end. After that, the processes of steps S28 to S31 are executed as described above. On the other hand, if it is determined in step S7 that the work holders 13 and 14 interfere with the processing section 24 based on the contents of the next step read ahead, the process proceeds to step S11, the interference flag is set, and the process proceeds to step S8. This interference flag indicates that interference will occur in the processing of the next step.

When it is determined in step S8 that the command is another command, the process proceeds to step S12, another process corresponding to the command is executed, and the process proceeds to step S9. As described above, in the present embodiment, the presence or absence of the interference is preliminarily determined and determined. If there is the interference during the processing, if the interference occurs, the hydraulic cylinder is lowered after the plate material reaches a predetermined processing position, and the plate material 11
Start the processing of. Further, when there is no interference, the machining of the hydraulic cylinder 40 and the movement of the plate 11 are simultaneously performed, and when the hydraulic cylinder 40 is lowered from the predetermined position before the movement of the plate 11 is finished, The cylinder 40 is made to stand by at a predetermined position.

As a result, the processing time can be shortened and the interference between the processing portion 24 and the work holder can be prevented. [Other Embodiments] (a) In the above-described embodiment, when there is no interference, the descent and the movement start are performed at the same time. However, for example, the movement time and the machining time are compared, and the movement time is longer than the machining time. In this case, the hydraulic cylinder 40 may be lowered after waiting for the moving time and the processing time to become equal. As a result, the same effect as that of the above embodiment can be obtained. (B) In the above embodiments, the turret punch press machine was described as an example of the hydraulic press, but the present invention can be applied to other hydraulic presses such as a shearing machine and a bender.

[0025]

In the hydraulic press according to the present invention, the next line of the machining program is pre-read, the presence or absence of interference is determined based on the pre-reading result, and the descent start timing of the hydraulic head is controlled depending on the presence or absence of interference. Interference between the work holder and the hydraulic head can be prevented, and the processing time can be shortened.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a hydraulic punch press machine that is a hydraulic press according to an embodiment of the present invention.

FIG. 2 is a schematic plan view thereof.

FIG. 3 is a schematic block diagram of a control device of a hydraulic punch press machine.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a flowchart showing a control operation.

FIG. 6 is a flowchart showing the contents of processing processing.

[Explanation of symbols]

 1 Punch Press Machine 13, 14 Work Holder 24 Machining Section 30 Control Device 32 MMC 33 PMC 40 Hydraulic Cylinder 41 Punch 43 Die

Claims (1)

[Claims] 1. A work holder for gripping a plate material, a hydraulic head for machining the gripped plate material, a pre-reading means for pre-reading a row next to a row being machined in a machining program consisting of a plurality of rows, Interference determination means for determining interference between the work holder and the hydraulic head based on the pre-reading result of the pre-reading means, and control means for controlling the descent start timing of the hydraulic head based on the determination result of the interference determination means. Hydraulic press with.