JPH05237562A - Controller for punch pressing machine - Google Patents

Abstract

PURPOSE:To shorten the working time at the time of a nibbling working. CONSTITUTION:This controller is the one used for a punch pressing machine for repeatedly executing successive punching at a fixed interval by a working program and is provided with an interval extracting means and a cycle control means. The interval extracting means extracts the interval of an over passing work from the working program. The cycle control means controls the working cycle of the over passing working base on the interval extracted with the interval extracting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a punch press machine, and more particularly to a control device for a punch press machine which repeatedly performs punching at intervals defined by a machining program.

[0002]

2. Description of the Related Art Generally, in a punch press, two kinds of punch processing speeds, high speed and low speed, can be selected. In the crank type punch press machine, the rotation speed of the crank is changed at high speed and low speed. Further, in the hydraulic punch press machine, the standby position on the ascending side is changed between high speed and low speed, and during high speed punching, the punch is waited at a position lower than during low speed punching.

In this type of punch press, a process called nibbling process is performed. The nibbling process is a punching process that is continuously and repeatedly performed, and is used, for example, when processing a hole larger than the punch diameter. At the time of nibbling processing, the maximum value of the nibbling pitch is predetermined by the processing speed. For example, it is 3.5 mm for high speed punching and 8 mm for low speed punching. One punch cycle in nibbling processing is defined by the maximum value of this nibbling pitch, and the same punch cycle is used even when nibbling processing is performed at a nibbling pitch smaller than this. For this reason, during normal nibbling processing, one punch is always waiting on the rising side.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
One punch cycle is always the time defined by the maximum value of the nibbling pitch regardless of the nibbling pitch. Therefore, when the nibbling pitch is small and more punching is performed, the processing time becomes longer than when the small nibbling pitch is performed at the maximum nibbling pitch.
Therefore, if the nibbling pitch is increased in order to shorten the processing time, the processed surface may become dirty, so the nibbling pitch cannot always be maximized. In particular, when nibbing is performed at a large pitch using a round punch, an unprocessed residue is generated between the pitches after nibbling, which is unsightly. Therefore, there are cases where the nibbling pitch cannot be made very large.

An object of the present invention is to shorten the processing time during nibbling.

[0006]

A control device according to the present invention is used in a punch press machine for repeatedly performing overtaking processing at intervals determined by a processing program, and includes an interval extracting means and a cycle control means. It has and. The interval extracting means extracts the interval of overtaking processing from the processing program. The cycle control means controls the punch cycle of the overtaking process based on the interval extracted by the interval extraction means.

[0007]

In the controller of the punch press machine according to the present invention,
At the time of overtaking processing, the interval extracting means extracts the interval of overtaking processing from the processing program. When the interval extracting means extracts the interval, the cycle control means controls the punching cycle for overtaking. For example, the waiting time on the rising side is changed according to the extracted interval, and when the interval is short, the waiting time is shortened. As a result, when the interval is short, the punch cycle becomes short, and the overall punching time becomes short.

[0008]

1 and 2 show a hydraulic punch press machine in which an embodiment of the present invention is adopted. 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 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.
A carriage 7 is arranged on the guide rails 5 and 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 has a pair of work holders 13, 14 for holding the plate material 11.
The cross slide 14 on which is mounted 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 9. 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 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 is moved up and down by a hydraulic cylinder (described later). On the other hand, the lower frame 2
On the side, a lower turret 22 that houses a plurality of dies is arranged to face the upper turret 12. Then, the processing section 24 is configured by the punch and the die moved to the processing position.

A control device 30 as shown in FIGS. 3 and 4 is provided in the throat section 4. This controller 3
0 is equipped with CNC31, MMC32, and PMC33 as a controller. Data is exchanged at high speed between the controllers via the window function. The CNC 31 is for controlling the X-axis and Y-axis moving mechanism, and includes a CPU, a ROM, a RAM, and the like. For example, the MMC 32 reads the machining program in advance, extracts nibbling pitch information of a nibbling command (NBL) in the machining program, and calculates the waiting time at the standby position at the time of ascent during nibbling machining by the extracted nibbling pitch information. .. MMC32
Has a CPU and memory elements such as ROM and RAM. The PMC 33 is for changing tools and controlling the position and pressure of a hydraulic cylinder, and has 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.
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 according to the speed command given from the DSC 36, and is composed of a speed amplifier, an integrating circuit, and the like.

On the other hand, a hydraulic cylinder 40 is vertically arranged on the processing section 24 (FIG. 2). Hydraulic cylinder 40
An engaging portion 42 with which the head of the punch 21 included in the processing portion 24 can be engaged is attached to the tip of the piston rod. An electrohydraulic 4-port 3-position servo valve 44 is connected to the hydraulic cylinder 40. A servo control coil 45 and a feedback detector 46 are provided on the spool of the servo valve 44. 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 via the A / D converter 48.
36 has been entered.

A pressure controller 50 is connected to the PMC 33 and outputs a pressure command to the pressure controller 50. The pressure control unit 50 is for controlling the pressure of the hydraulic cylinder 40, and outputs a control signal in response to a pressure command from the PMC 33. A control signal from the pressure control unit 50 is input to the proportional electromagnetic relief valve 51. The relief valve 51 includes a pump 52 and a motor 53 that drives the pump 52.
Is connected to a hydraulic circuit 54 including. This hydraulic circuit 5
4 is also connected to another hydraulic device 55 for controlling another actuator. The hydraulic line of the hydraulic circuit 54 is connected to the servo valve 44.

In the control device 30, as shown in FIG. 4, the MMC 32 has a keyboard 34 and a CRT 3
5, a host interface 37 for connecting to a host computer and other input / output units are connected. Further, the turret drive unit 19 and other input / output units are connected to the PMC 33. Furthermore, the CNC 31 has an X-axis,
An axis control unit 39 for controlling the Y axis is connected.

Next, the operation of the control device 30 during nibbling will be described with reference to the flow charts of FIGS.
The CNC 31 first determines in step S1 whether or not the automatic mode has been set. In the automatic mode, machining is automatically performed according to the NC program. When the automatic mode is designated, the process proceeds to step S2. In step S2, the automatic mode flag is set. Step S3
Then, it is determined whether or not a program number (hereinafter referred to as ONo.) Which is a file name of the NC program is selected. This ONo. Is displayed together with the serial number on the CRT 35 or the like connected to the MMC 32, and is selected by inputting the serial number from the keyboard 34. In step S3, ONo. Is selected, step S
Go to 4. In step S4, the selected ONO.
Open NC program. On the other hand, step S1
If the automatic mode is not set in step S3
Move to. In step S3, the automatic mode flag is reset. In the CNC 31, the automatic mode setting and the ONo. Is selected.

As shown in FIG. 6, the MMC 32 first determines in step S30 whether or not the automatic mode is set. This automatic mode is CNC3 as described above.
It is set in step S2 of 1. When it is determined in step S30 that the automatic mode is set, step S30
Move to 31. In step S31, MMC-CNC
With the window function, ONo. To get. Then, in step S32, the acquired ONO. Determines whether or not it is the same as what is stored in. That is, it is determined whether or not the processing is the same as the previous processing. Same ONo. If so, the process proceeds to step S33. In step S33, it is determined whether or not all the nibbling data has been transferred. If the transfer of the nibbling data has not been completed, the process proceeds to step S34.

In step S34, the NC program is acquired by the MMC-CNC window function. Succeedingly, in a step S35, the NC program is prefetched and its contents are analyzed. In step S36, it is determined whether or not there is a nibbling instruction in the analyzed NC program. If there is a nibbling instruction, the process proceeds from step S36 to step S37. In step S37, the nibbling pitch in the nibbling command is extracted. Step S3
In step 8, the waiting time at the elevated position during nibbling processing is calculated from the extracted nibbling pitch. This waiting time is stored as a table in the RAM for each nibbling pitch according to the punching speed (high and low speeds) according to the plate thickness, and the nibbling pitch and the separately entered plate thickness information are used as addresses. The contents are read and calculated.
In step S39, it is determined whether the DSC 36 has issued a data transfer request for the waiting time. If there is a transfer request from the DSC 36, the process moves to step S40.
In step S40, the calculated waiting time data is set to DS.
Transfer to C36. When the waiting time data is transferred, the process proceeds to the next processing.

On the other hand, when it is determined in step S30 that the automatic mode is not set, the process proceeds to step S41. In step S41, ONO. Reset the memory of. When the memory is reset, the next process is performed. Also, step S3
Same as memory in No. 2 If it is determined that it is not, the process proceeds to step S42. In step S42, the ONo. Is temporarily stored in RAM.

When it is determined in step S33 that the data transmission is completed, the process proceeds to the next process. If it is determined in step S36 that there is no nibbling instruction,
Alternatively, if it is determined in step S39 that there is no data transfer request from the DSC 36, the process proceeds to the next process. DSC3
In step 6, as shown in FIG. 7, first, in step S51, the process waits until a nibbling command is output. When the nibbling command is output, the process proceeds to step S52. Step S5
In 2, the data request signal is output to the MMC 32. In step S53, reception of data from the MMC 32 is waited for. When the standby time data is received from the MMC 32 in step S53, the process proceeds to step S54. In step S54, the waiting time is set in the received data.
In step S55, it is determined from the thickness information included in the NC program whether the thickness is greater than 2 mm. When the plate thickness is thicker than 2 mm, the process proceeds to step S57.

In step S57, the standby position is set to L2. This standby position is a standby position for low speed punching. If the plate thickness is less than 2 mm, the process proceeds to step S56. In step S56, the standby position is set to L1. The standby position L1 is located below the standby position L2 and is a standby position for high-speed punching. Step S
At 58, the descent starts. In step S59, it is determined whether or not the descending end has been reached. The descending operation in step S58 is continued until the descending end is reached. When it reaches the descending end, the process proceeds to step S60. In step S60, the raising operation is performed. In step S61, it is determined whether or not the standby position set in step S56 or S57 has been reached. The ascending operation of step S60 is performed until the standby position is reached.

When it reaches the standby position, the process proceeds to step S62. In step S62, the process waits until the waiting time elapses. The standby time here is the standby time set in step S54, and is the standby time according to the nibbling pitch during the nibbling process. By setting the waiting time here according to the nibbling pitch, the cycle of one punch changes depending on the nibbling pitch. When the nibbling pitch is small, the waiting time is shorter than before and the overall nibbling processing time is shorter. Become. When the waiting time elapses, the process proceeds to step S63. Step S63
Then, it is determined whether or not the nibbling process is completed.
If it is determined that the nibbling process has not ended, the process returns to step S58. When it is determined that the nibbling process is completed, the process proceeds to the next process.

In the above embodiment, the standby position and the standby time are changed according to the plate thickness, and high-speed punching is performed when the plate thickness is thin, so the nibbling time is further shortened. Other Embodiments (a) In the above embodiment, the standby position is changed according to the plate thickness, but the present invention is not limited to this. (B) In the above embodiment, the waiting time is changed using MMC or DSC, but the present invention is not limited to this. (C) In the above embodiment, the punch cycle is controlled by changing the waiting time, but the present invention is not limited to this, and the punching speed is controlled by comprehensively changing the lifting speed and the waiting time. May be.

[0026]

In the punch press machine control device according to the present invention, the punching cycle of the punching process is controlled by the interval of the punching process. Therefore, the punch cycle can be changed according to the interval, for example, when the interval is small. The punch cycle can be shortened. Therefore, it becomes possible to shorten the processing time for the overtaking processing.

[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 control flowchart of CNC.

FIG. 6 is a control flowchart of MMC.

FIG. 7 is a DSC control flowchart.

[Explanation of Codes] 1 Punch Press Machine 30 Control Device 31 CNC 32 MMC 33 PMC 36 DSC

Claims (1)

[Claims] 1. A control device of a punch press machine for repeatedly punching at an interval determined by a machining program, the interval extracting means extracting the interval from the machining program, and the interval extracting means extracting the interval. A control device for a punch press machine, comprising: a cycle control means for controlling a punch cycle of the punching-out process based on a predetermined interval.