JPH0741324B2 - Mold check device for hydraulic press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die check device, and more particularly to a die check device for a hydraulic press machine for determining the quality of a combination of a punch and a die, which is a die for a hydraulic press machine.

[0002]

2. Description of the Related Art In a punch press machine, particularly a turret punch press machine, a plurality of punches are arranged on an upper turret and a plurality of dies are similarly arranged on a lower pallet. The punch and die used for the same processing are usually set in the same station of the upper and lower turrets. However, if this setting is mistaken, especially if the diameter of the die is smaller than the diameter of the punch, they will be damaged.

In order to prevent such damage, in the conventional crank type punch press machine, after setting the die to be used on each turret, the operator visually confirms it or lowers the punch manually. I was checking the quality of the combination.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the quality of the combination of the punch and the die is checked visually or by manual operation, when many punches and dies are set in the turret, the manual operation and work such as rotating the turret and lowering the punch can be performed. It takes a lot of time to check the quality of the combination of molds.

An object of the present invention is to automatically judge the quality of a combination of a punch and a die in a short time.

[0006]

A die checking device for a hydraulic press according to the present invention comprises an operating pressure setting means and a judging means. The working pressure setting means sets the working pressure of the hydraulic cylinder for moving the punch to a trial pressure lower than the working pressure. The determining means moves the punch under the test pressure and determines the quality of the combination of the punch and the die based on the moving distance and the moving time of the punch.

[0007]

In the die check device of the hydraulic press according to the present invention, when the quality of the combination of the punch and the die is determined, the working pressure setting means sets the working pressure of the hydraulic cylinder to a trial pressure lower than the working pressure. Set. This pressure is such that they do not break when the punch abuts the die, for example. Then, when the punch is moved by the trial pressure, the quality of the combination of the punch and the die is determined based on the moving distance and the moving time of the punch. That is, if the punch has not advanced the predetermined moving distance after the predetermined moving time, it is determined that the punch and the die are in contact with each other, and the combination of the punch and the die is defective, and the predetermined moving time is exceeded. When the vehicle has traveled a predetermined moving distance in, it is determined that the combination is good. In this way, the quality of the combination of the punch and the die can be automatically determined in a short time.

[0008]

1 and 2 show a hydraulic turret punch press machine according to an embodiment of the present invention. 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. At the center of the upper surface of the lower frame 2, the fixed table 10
Are arranged. On both sides of the upper surface of the lower frame 2,
A pair of guide rails 5 and 6 are arranged. A carriage 7 is arranged on the guide rails 5 and 6 so as to be movable in the depth direction (Y-axis direction). In the carriage 7,
The movable tables 8 and 9 arranged on both sides of the fixed table 10 are fixed. The plate material 11 is attached to the carriage 7.
A cross slide 15 to which a pair of work holders 13 and 14 for gripping is attached is provided 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. In addition, the processing unit 24 is configured by a punch, a die, a hydraulic cylinder, and the like arranged at the processing position.

A control device 30 is provided in the throat section 4 as shown in FIG. The control device 30 includes a CNC 31, a MMC 32, and a PMC 3 as controllers.
Equipped with 3. 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. MM
The C32 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 has a function of determining the quality of the combination of the dies when the punches and the dies are arranged on the upper turret 12 and the lower turret 22. Here, for example, the pressure of the hydraulic cylinder 40 is set to a trial pressure that does not damage the punch even if the punch comes into contact with the die, and when the punch is machined by the pressure, a predetermined pressure is set within a predetermined time. The quality of the combination of molds is determined by whether or not the distance has moved. In other words, if the punch comes into contact with the die and does not move any further within the predetermined time and does not move for the predetermined distance, it is judged that the combination of these molds is defective, the punch is fitted into the die, and the punch is inserted within the predetermined time. Punch is a certain distance (for example,
When the distance to move to the descending end) is reached, it is judged that the combination is good. The PMC 33 controls the hydraulic pressure and the turret drive, and controls the CPU and R
It includes OM and RAM.

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 hydraulic 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. ing.

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. When checking the mold,
In response to an instruction from the MMC 32, the pressure control unit 50 is controlled via the PMC 33, and the pressure applied to the hydraulic cylinder 40 is controlled to a predetermined test pressure (for example, 20 kg / cm ² ).

The hydraulic cylinder 40 is 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. Hydraulic cylinder 40
An electrohydraulic 3-position 4-port servo valve 44 is connected to the. The spool of the servo valve 44 is provided with a servo control coil 45 and a feedback detector 46. A control signal from the speed control unit 38 is input to the servo control coil 45.

The detection signal from 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 that detects the position of the piston. The output of the position detector 47 is sent to the DSC 3 via the A / D converter 48.
It has been entered in 6.

On the other hand, the pressure control unit 50 is given a pressure command from the PMC 33. 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 with reference to the control flowcharts shown in FIGS. First, in step S1, initial settings such as moving the work table to the origin are performed. Next, in step S2, it is determined whether or not the combination of punch and die is checked, in step S3, it is determined whether or not normal processing is performed, and in step S4, it is determined whether or not another command is issued. To do. Each judgment is made by whether or not the operator presses a key for each command and a flag is set.

When a command for checking the mold is issued, the process proceeds from step S2 to step S5. In step S5, it is determined whether or not to check all the molds attached to the turrets 12 and 22, and in step S6, it is determined whether or not to check some of the molds. In step S7, it is determined whether or not a mold check mode start command has been issued. When the check of all the molds is instructed, the process proceeds from step S5 to step S8. In step S8, the station numbers of all the molds are automatically set in the station order. When a part of the mold check is instructed, the process proceeds to step S9 and waits for the input of the station number of the mold to be checked.

When a command to start the mold check mode is issued, the process proceeds from step S7 to step S10,
A mold check subroutine as shown in FIG. 6 is executed. In FIG. 6, in step S11, the first mold of the set mold or the inputted mold is positioned. In step S12, the descending speed and operating pressure of the hydraulic cylinder 40 are set. This operating pressure is larger than the elastic force of urethane rubber (stripper) arranged around the punch and smaller than the tool breaking force when the punch 41 and the die 43 contact each other. Further, the descending speed is descended at a high speed from the start of descending to a position before the position where the punch and the die come into contact with each other, and then at a low speed so that the punch and the die are not damaged by an impact. Such pressure and speed settings are given to the speed control unit 38 and the pressure control unit 50 via the MMC 32, PMC 33, DSC 36 and the like. Step S
13, the hydraulic cylinder 40 at the set pressure and speed
To lower.

In step S14, it is determined whether or not a predetermined time has elapsed since the descent was started. This predetermined time is a time with some margin in the time from the start of the descent to the time when the hydraulic cylinder 40 reaches the descent end. Until the predetermined time elapses, the process returns to step S13 and continues to descend. When the predetermined time has elapsed, the process proceeds to step S15. In step S15, it is determined whether or not the hydraulic cylinder 40 has reached the lower end. Here, when the hydraulic cylinder 40 reaches 3 lowers, the combination of the punch 41 and the die 43 is good,
Judge that the punch fits inside the die. Step S
If it is determined in 15 that the lower end has not been reached, the process proceeds to step S16. In step S16, the station numbers of the molds are combined and M is determined as a defective station.
Stored in RAM in MC32.

When it is determined that the descending end has been reached, the process proceeds from step S15 to step S17. Step S
At 17, it is determined whether or not all the molds have been checked. If it is determined that all the dies have not been checked, the process returns to step S24 and the next die is positioned. When it is determined that all the molds have been checked, the process proceeds from step S17 to step S18. In step S18, the mold station number stored in the RAM on the CRT 35, that is, the mold station number determined to be defective in combination is displayed. At this time, if there is no defect, the fact is displayed. When these processes are completed, the process returns to the main routine.

On the other hand, when a normal machining command is issued,
The process moves from step S3 to step S20. In step S20, a normal machining subroutine as shown in FIG. 7 is executed. In FIG. 7, a machining program is read in step S21. In step S22, the operator waits for a work start command. When the work start command is input, the process proceeds to step S23, and one step of the machining program is read. In steps S24 to S27, the content of the read one step is determined. That is, step S2
In step 4, it is judged whether or not the contents of the read step mean a machining command. In step S25, it is determined whether it means a tool change command. In step S26, it is determined whether or not it means another command. In step S27, it is determined whether or not the end command is meant. If YES is determined in step S27, the process ends. If NO is determined, the process returns to step S23 to read the next step. If the command read in step S23 is the processing process, the process proceeds to step S28 and the processing process is performed. If the tool is to be replaced, the process proceeds to step S29 and the tool is replaced. If it is another command, the process proceeds to step S30,
Other processing according to the command is performed.

When a command other than the mold check mode and the normal machining mode is issued, the process proceeds from step S4 to S31, and the process according to the command is executed. As described above, in this embodiment, since the molds can be automatically checked, even if the worker accidentally mounts the molds in the turret, they can be automatically checked in a short time without visually checking them. . [Other Embodiments] (a) In the above embodiments, the hydraulic turret punch press machine was described as an example of the hydraulic press, but the present invention can also be applied to other hydraulic press machines. (B) In the above embodiment, the speed is controlled to be high speed and low speed, but it is not always necessary to control the speed.

[0025]

In the die checking device for the hydraulic press according to the present invention, the working pressure of the hydraulic cylinder is set to the trial pressure, the punch is moved by this pressure, and the punch is moved by the moving distance and the moving time. Since the quality of the combination with the die is determined, it is possible to automatically check the improper combination of the die due to a mistake in setting the punch and the die.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a hydraulic punch press machine 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 mold check processing.

FIG. 7 is a flowchart showing the contents of normal processing.

[Explanation of symbols]

 1 Punch Press Machine 30 Control Device 32 MMC 33 PMC 40 Hydraulic Cylinder 41 Punch 43 Die 47 Position Detector 50 Pressure Control Section

Claims (1)

[Claims] 1. A working pressure setting means for setting a working pressure of a hydraulic cylinder for moving a punch to a trial pressure lower than a working pressure, and moving the punch at the trial pressure, and a moving distance and a movement of the punch. A die check device for a hydraulic press machine, comprising a determination means for determining the quality of a combination of a punch and a die depending on time.