JPH0433726A - Controller for punch pressing machine - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of timing by inputting the upper dead point detecting signal and each controlling standard signal and providing a mechanical controlling means controlling the servo motor, etc., to move the clutch brake of the crankshaft and the work. CONSTITUTION:A upper dead point detecting means detects the upper dead point of the crankshaft, and outputs the upper dead point detecting signal A. A control standard signal generating means 20 inputs the upper dead point detecting signal A, and outputs the ram stopping position, the moving timing at the nibbling, and the controlling standard signal in order to set the movement timing after punching. A mechanical control means 7 which inputs the upper dead point detecting signal A and each control standard signal, and controlling the servo-motor, etc., to move the clutch brake of the crank shaft and the work is provided. Therefore, various kinds of the control standard signals can be generated with the software or hard ware based on the ram upper dead point detecting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a control device for a punch press machine having a ram that is driven up and down by the rotational movement of a crankshaft.

(Prior Art) A punch press machine, such as a crank-type turret punch press, which has a ram that is driven up and down by the rotational movement of a crankshaft, sometimes performs nibbling in addition to general single-shot punching.

In these punch press machines, in general punching processing, control is required to disengage the clutch when shearing is completed, to start moving the workpiece to the next processing position when punching is completed, and to stop the ram at the top dead center. In addition, nibbling requires control to move the work piece in small increments in accordance with the ram movement.

Conventionally, in a punch press machine as shown in FIG. 3, a timing signal as shown in FIG. 4 was obtained to control the ram and workpiece.

The punch press machine shown in FIG. 3 has a ram 2 that is driven up and down by a crankshaft 1.
By pushing down the head of the die 4 below,
A workpiece W interposed between a punch 3 and a die 4 is punched.

One end of the crankshaft 1 is connected via a clutch/brake 5 to a flywheel 6 that is rotationally driven by a motor M, and the other end is connected to four dogs DA, DB + DC + DD.
A cylindrical body with is connected.

Each dog DA, DB, DC+I)I) is detected by four proximity sensors SA, SR, SC, and SD. Let A, B, C, and D be the signals detected by each sensor (SA, SR+sc, sl).

As shown in FIG. 4, signal A is a top dead center detection signal. Since the top dead center dog DA has a fixed mechanical position,
There is no need for adjustment, and one cycle time tA from when the top dead center signal A turns off until it turns on is approximately constant.

Signal B is a signal for obtaining the clutch disengagement (off) timing, and the stopping position of the ram 2 is determined by adjusting the dog DB signal. The time tB also changes.

Signal C is a signal for detecting the nibbling start, and is the signal for dog D. By adjusting the position, the axis movement timing of the X and Y axes during nibbling is determined, and the punching timing can be adjusted. The time tc also changes.

By adjusting the position of the dog DD, the signal indicating the punch completion point can determine the movement timing of the X and Y axes after punching. The time to also changes.

Detection signals A and B of the above sensors SA, SB, SC, and SD
, C, D are input to the programmable controller,
Processing signals from this programmable controller are input to the NC device, and the ram and X- and Y-axis servo motors for driving the workpiece are controlled at appropriate timings.

(Problem to be Solved by the Invention) However, in the conventional punch press machine control device as described above, in addition to the top dead center detection signal A of the ram,
The configuration was such that the timing was adjusted by detecting the clutch disengagement signal B, the nibbling start signal C, and the punching completion signal, respectively, and adjusting the dog position appropriately, so there were many input points, and the adjustment was time-consuming. The problem was that it was dangerous.

Furthermore, since a plurality of proximity sensors are used to perform one control, if any one of the proximity sensors fails, all control becomes impossible, resulting in a problem of low reliability.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a control device for a punch press machine that allows easy adjustment of each signal and has high reliability.

[Structure of the invention]

(Means for Solving the Problems) The present invention for solving the above problems has a ram that is driven up and down by the rotational movement of a crankshaft, detects the rotational position of the crankshaft, and detects the stop position of the ram. , a control device for a punch press machine that controls the timing of movement of a workpiece during nibbling and the timing of movement of a workpiece after punching, comprising a top dead center detection means for detecting the top dead center of the crankshaft and outputting a top dead center detection signal. and input the top dead center detection signal, and determine a control reference signal for determining the stop position of the ram and the movement timing of the workpiece in nibbling after a plurality of preset times based on the input time of the signal. control reference signal generating means for outputting a control reference signal for determining the movement timing of the workpiece after punching, and a control reference signal generating means for outputting a control reference signal for determining the movement timing of the workpiece after punching; The present invention is characterized in that a mechanical control means is provided for inputting a control reference signal and controlling a clutch brake of the crankshaft, a servo motor for moving the workpiece, and the like.

Further, the plurality of times preset in the control reference signal generation means can be changed according to the previous operation time of the top dead center detection signal of the top dead center detection means.

(Function) In the punch press machine control device of the present invention, only the top dead center is detected, and control reference signals such as clutch disengagement, nibbling start, and punch completion signals are based on the detection point of this top dead center detection signal. , is detected after a preset time has elapsed.

Further, the preset time is variable depending on the previous operation time of the top dead center detection signal.

Therefore, in the punch press machine control device of the present invention,
Detection of the control reference signal can be configured almost entirely by software or hardware parts, making adjustment easy and improving reliability as there are almost no parts that fail.

(Embodiment) In FIG. 1 showing an embodiment of the present invention, a digital signal input/output device (D
A top dead center detection signal A is output to I/DO) 8.

This top dead center detection signal A is the same as that generated by the top dead center dog DA and proximity sensor SA shown in the conventional example of FIG.

However, in this example, other dogs D B +I)C,I),
and other proximity sensors SB+s, , SD are not provided.

A trigger generation section 9 is connected to the digital signal input/output device 8, and the top dead center detection signal A is transmitted to the trigger generation section 3 and a programmable controller (PC) 1.
It is configured to be output to 0.

The trigger generating section 9 is connected to the input terminals of a counter 11 and three preset counters 12, 13, and 14.

The other input terminals of each counter 11, 12, 13.14 are also connected to the clock generator 15.

Further, a correction processing section 16 is connected to the output end of the counter 11, and this correction processing section 16 is connected to each preset counter 12, 13, and 14.

Furthermore, each preset counter 12.13.14 is connected to a respective signal generator 17.18.19. Each of the signal generating units 17, 18, and 19 includes signals B for clutch disengagement, nibbling start, and punch completion as shown in the conventional example.
It outputs signals corresponding to C and D, respectively.

Clutch disengagement signal B is output to PCIO and processed by PC4. Further, the nibbling start signal C and the punching completion signal are processed within the NC.

The clock generator 15 generates pulses of a constant frequency.

The trigger generating section 9 generates a starting signal to each counter 11, 12, 13, and 14 when the top dead center detection signal A changes from on to off.

The counter 11 counts clocks from when the top dead center detection signal A turns on until it turns on again.

The preset counters 12, 13, and 14 are counters that can be set to arbitrary values, and output a count-up signal when the set value and the value obtained by counting the clocks become the same. By changing this setting value, the signal timing can be adjusted.

These set values can be set by searching from table data of optimal values created in advance and interpolating as appropriate, depending on the workpiece material, plate thickness, mold dimensions, and other processing conditions.

The correction processing unit 16 corrects the set values of the preset counters 12, 13, and 14 in consideration of the large variation in the count value of the counter 11.

The signal generators 11, 12, 13 are preset counters 1
Based on the outputs of 2.13.14, a time output corresponding to each signal is output. The time appropriate for each signal is set as an initialization value, and can be changed by external setting.

Trigger generator 3 and each counter 11.12°13.1
4, the correction processing section 10, and each signal generation section 17.18.1
9 constitutes a control reference signal generation section 20.

Next, the operation of the control device having the above configuration will be explained using the timing chart of FIG.

First, when the top dead center detection signal turns from on to off, a trigger pulse is output from the trigger generator 9, and each counter 11,
12.13.14 starts counting.

Therefore, when the preset counters 12, 13, and 14 reach the set values, they each output a count-up signal and are reset to return to the initial state.

On the other hand, the signal generators 17, 18, 19 generate clutch disengagement, nibinder start, and punch completion signals based on the outputs of the preset counters 12, 13, and 14 at the initialization value or during the set time (TBr Tc + To
) Outputs a signal that turns on.

When the top dead center detection signal A changes from off to on, the counter 11 stops counting and corrects the count value to the correction processing unit 1.
6 and returns to the initial state.

In the correction processing unit 10, a count reference value determined from the rotational speed of the crankshaft 10 and the clock frequency is set,
Compare that value with the count value of the counter 11, and if there is a large difference, it is assumed that the rotational speed of the crankshaft 1 has fluctuated, and in order to match the timing of each signal, it is corrected to the set value of the preset counter 12゜13.14. multiply.

Trigger generation unit 9, each counter 11, 12, 13.14
, the signal generating sections 17, 18, 19, and the correction processing section 16 are extremely common and can be incorporated as part of the control software of the NC.

Therefore, according to the control device of the punch press machine of this example, the dog DB, DC1DD and sensor SR shown in the conventional example,
Signals B, C corresponding to signals B, C, D by SC and SD
, D can be obtained by the control reference signal generation section 20, and the adjustment work is extremely simple.

Further, since the control reference signal generation section 20 can be obtained by a hardware circuit or a software circuit, the device configuration is simple in either case, and reliability can be increased.

Furthermore, a correction processing section 16 is provided, and the preset counter 1
Since the preset values of 2.13.14 are variable, each signal B, C, and D can be output at the optimal timing according to changes in the rotational speed of the crankshaft 1, and the ram 2 and workpiece can be controlled at the optimal timing. can do.

In the above embodiment, as means for obtaining the top dead center detection signal A,
Although an example using the dog DA and sensor SA similar to the conventional example has been shown, the detection method of the signal A is not limited to this.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in any appropriate manner by making appropriate design changes.

〔Effect of the invention〕

As described above, since the present invention is a control device for a punch press machine as described in the claims, various control reference signals such as clutch disengagement, nibbling start, and punch completion signals are based on the ram top dead center detection signal. It can be generated by software or hardware, its timing adjustment is easy, and the reliability of the device is high.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the main parts of a control device for a punch press machine according to an embodiment of the present invention, Fig. 2 is a timing chart showing its operation, and Fig. 3 is a crankshaft showing a conventional signal detection method. FIG. 4 is an explanatory diagram showing each control reference signal. 9...Trigger generation section 11.12.13.14...Counter 15...Clock generation section 16...Correction processing section 17.18.19...Signal generation section A...Top dead center detection Signal B...Clutch disengagement signal C...Nibbling start signal D...Punching completion signal Agent Patent attorney Hidekazu Miyoshi Figure 2

Claims (2)

[Claims] (1) It has a ram that is driven up and down by the rotational movement of a crankshaft, and the rotational position of the crankshaft is detected to control the stop position of the ram, the movement timing of the workpiece during nibbling, and the movement timing of the workpiece after punching. In a control device for a punch press machine, a top dead center detection means for detecting a top dead center of the crankshaft and outputting a top dead center detection signal is provided, the top dead center detection signal is input, and a time point at which the signal is input is provided. A control reference signal for determining the stop position of the ram after a plurality of preset times based on the reference, a control reference signal for determining the movement timing of the workpiece in nibbling, and a control reference signal for determining the movement timing of the workpiece after punching. control reference signal generating means for outputting a control reference signal of the crankshaft, and inputting the top dead center detection signal and each control reference signal outputted by the control reference signal generating means, the clutch brake of the crankshaft and the workpiece 1. A control device for a punch press machine, comprising a mechanical control means for controlling a servo motor for moving the punch press. (2) In claim 1, the plurality of times preset in the control reference signal generation means can be changed according to the previous operation time of the top dead center detection signal of the top dead center detection means. A control device for a punch press machine.