JPH0785840B2 - Hydraulic press - Google Patents

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 gripping a plate material and a hydraulic head for processing the gripped plate material.

[0002]

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

In this type of hydraulic punch press machine, 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 tool is raised to the top dead center only when exchanging the tool, and at other times, the tool is allowed to stand by at the lowest allowable level to minimize the stroke.

[0004]

In the hydraulic punch press machine, when press working is performed with the stroke minimized, the gap between the lower surface of the tool and the table becomes smaller than that of the crank type. Therefore, there is a problem of interference between the work holder that holds the plate material and the tool that constitutes the hydraulic head. That is, when the gap is small and 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, it can be considered 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 detecting this. . 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 machining time and prevent the work holder from interfering with the hydraulic head.

[0007]

A hydraulic press according to the present invention includes a work holder for holding a plate material and a work holder close to the plate material.
Hydraulic press der with a hydraulic head for machining the gripped sheet waiting in the workpiece holder in the position of the lower limit was
Therefore , it is provided with a pre-reading means , an interference determination means, and a control means. Former reader in stages, to look ahead all the rows of the machining program. The interference determination means is based on the pre-reading result of the pre-reading means,
Determine the interference between the work holder and the hydraulic head. The control means controls the oil if the interference is judged by the interference judgment means.
From the lowest position of the standby position of the pressure head to the work holder
Change control to a position that does not interfere .

[0008]

In the hydraulic press machine according to the present invention, the pre-reading means pre-reads all the lines of the processing program before the press working, and the interference judging means judges the interference between the work holder and the hydraulic head based on the pre-reading result. . And the interference determination means interferes
If it is determined that the standby position is the lowest limit by the control means.
The position is changed to a position that does not interfere with the work holder.
This makes the stroke of the hydraulic head as small as possible.
As a result, the processing time can be shortened and the interference between the work holder and the hydraulic head can be reliably prevented.

[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 at 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 arranged 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 a 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 holding the plate material 11 is 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 is composed of 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 in the carriage 7. The moving mechanism includes 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 to the ball screw 21. The ball nut 23 is fixed to the cross slide 15.

An upper turret 12 for accommodating a plurality of punches is rotatably provided on the upper frame 3. Inside the upper turret 12, a punch head that is moved up and down by a hydraulic cylinder (described later) is provided. 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 arranged at the processing position, the hydraulic cylinder 40, 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 exchanged 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 types of processing using a high-level language, and includes a CPU, ROM, RAM and the like. The MMC 32 pre-reads the contents of all lines of the machining program, and based on the pre-read contents, the work holder 1
It is determined whether or not 3, 14 and the processing section 24 interfere with each other.
This determination is made by, for example, whether or not the coordinates of the locus connecting the machining positions in the contents of each preread line are near the coordinates of the positions of the tips of the work holders 13 and 14. P
The MC 33 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, and outputs a speed command to the speed control unit 38 according to the position information and speed information given from the MMC 32 and 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, an integrating circuit, and the like. . A pressure controller 50 is connected to the PMC 33. The pressure control unit 50 is for controlling the pressure of the hydraulic cylinder 40.

A hydraulic cylinder 40 is vertically arranged above the processing position. At the tip of the piston rod of the hydraulic cylinder 40, an engaging portion 42 with which the head of the punch 41 forming the processing portion 24 can engage is attached. The hydraulic cylinder 40 includes an electrohydraulic 3-position 4-port servo valve 4
4 is connected. The spool of the servo valve 44 has a servo control coil 45 and a feedback detector 4
6 is provided. A control signal from the speed control unit 38 is input to the servo control coil 45.
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. As a result, the flow rate passing through the servo valve 44 is controlled, and the ascending / descending speed of the hydraulic cylinder 40 is controlled.

Further, the hydraulic cylinder 40 is provided with a position detector 47 for detecting the position of the piston. The output of the position detector 47 is sent to the DSC via the A / D converter 48.
It is input to 36. On the other hand, the pressure control unit 50 has P
A pressure command is given from the MC 33. The pressure control unit 50 converts this into an electric signal and supplies it to the proportional electromagnetic relief valve 51. 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. 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. In step S3, the read machining program is pre-read by the MMC 32. Step S
In No. 4, the work holders 13, 1 at the machining position of each step included in the machining program are read according to the pre-reading result.
4 and the processing unit 24 interfere with each other. As described above, this determination is made based on whether or not the locus connecting the machining positions included in the machining program is located near the tips of the work holders 13 and 14. If it is determined that there is interference, the process proceeds to step S5. In step S5, the standby position is set to L1. This standby position L1
Is in a standby position where the work holders 13 and 14 and the processing section 24 do not interfere with each other. If it is determined that no interference occurs, the process proceeds to step S6. Step S6
Then, the standby position is set to L2. This standby position L2
Is a standby position for processing with a minimum stroke.

When the operation in step S5 or S6 is completed, the process proceeds to step S7. In step S7, the operator waits for a work start command. When the work start command is input, the process proceeds to step S8. In step S8, the hydraulic cylinder 40 is lowered to the standby position set in step S5 or S6, and is temporarily made to stand there. In step S9, one step of the machining program is read. In steps S10 to S12, the content of the read one step is determined. That is, in step S10, it is determined whether or not the content of the read step means a machining command. In step S11, it is determined whether or not it means another command. In step S12, it is determined whether or not the end command is meant. Step S
If YES is determined in 12, the process ends. If NO is determined, the process returns to step S9 to read the next step.

On the other hand, when it is determined in step S10 that the step means machining, the process proceeds to step S13. In step S13, the plate material 11 is attached to the work holder 1
It is gripped by 3, 14 and moved to a desired processing position. In step S14, the hydraulic cylinder 40 is lowered from the standby position to the lower end, and the plate material 11 is punched. In step S15, the hydraulic cylinder 40 is raised from the lower end to the standby position. With these operations, one-step processing is completed. If it is determined in step S11 that it means another command, the process proceeds to step S16. In step S16, processing according to the command is performed.

As described above, in this embodiment, all lines of the machining program are pre-read, the presence or absence of interference is determined according to the pre-read result, and the standby position is changed according to the presence or absence of interference.
Since the stroke is changed, the machining time can be shortened and the work holders 13 and 14 and the machining section 24 can be prevented from interfering with each other. Other Embodiments (a) In the above embodiments, MMC was used as the prefetching means, but the present invention is not limited to this. (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.

[0021]

With the hydraulic press according to the present invention, all lines of the machining program are pre-read, and the result of the pre-read causes interference .
If it is determined that there is interference, the standby position is the lowest
Position is changed to a position where it does not interfere with the work holder.
Thus, it is possible to prevent the work holder from interfering with the hydraulic head and reduce the processing time.

[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.

[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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B30B 15/26 8718-4E G06F 17/00

Claims (1)

[Claims] 1. A work holder for holding a plate member, and the plate member.
Hydraulic flops and a hydraulic head for machining the gripped sheet in the workpiece holder on standby at the position of the lowermost limit close to the
And pre-reading means for pre-reading all the lines of the machining program, interference judging means for judging the interference between the work holder and the hydraulic head based on the pre-reading result of the pre-reading means, and the interference judging means. If interference is determined by
The standby position of the hydraulic head from the lowest position
A hydraulic press, comprising: a control unit that performs change control to a position that does not interfere with the work holder .