JPH0239627Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a press machine.

[Prior Art] For example, in the turret punch press 1 shown in FIG. A plurality of dies 9 corresponding to each punch 5 are attached to the lower turret 7 so as to be replaceable. In addition, the lower turrets 3 and 7 rotate together to bring a desired set of punches and dies 5 and 9 directly below the press ram 11, and then the press ram 11 causes the punch 5 to strike, thereby striking the workpiece 13 into a desired shape. Pull it out.

The press ram 11 reciprocates by converting the rotational force of a press motor (not shown) into reciprocating motion by a converting means such as a piston crank mechanism.

Further, the workpiece 13 is freely moved on the fixed table 19 by the reciprocating motion of the carriage 17 in the X-axis direction and the reciprocating motion of the movable table 15 in the Y-axis direction. Therefore, the desired portion of the workpiece 13 is appropriately positioned at the processing position of the upper and lower turrets 3 and 7. The reciprocating movement of the carriage 17 and the movable table 15 is caused by a ball screw rotated by a servo motor (not shown) (hereinafter, this reciprocating movement will be abbreviated as axial movement).

By the way, regarding the punching press 1,
At the same time as the positioning of workpiece 13 is completed, press ram 1
1 is generally used for punching. Therefore, as shown in FIG. 4 a, b, c, and d, which are time charts of the axis movement speed, for example, when the workpiece movement time, that is, the axis movement time T becomes shorter, the punching period also becomes shorter. Become.

However, such punching presses have had problems in that if the punching cycle is too short, the frame etc. may resonate and the clutch, brake etc. may seize.

[Purpose of the invention] The purpose of this invention is to solve the above-mentioned problems of conventional press machines, and by restricting the punching cycle from becoming excessively short, resonance of the frame, etc., and of the clutch and brake are reduced. It is an object of the present invention to provide a press machine that can prevent troubles such as seizure.

[Structure of the invention] In order to achieve the above object, the press machine of this invention includes a timer device that regulates the minimum punching period, which is set in consideration of the resonance frequency of the frame, etc., and the heat generation due to repetitive operation of the clutch, brake, etc. and a control device for forcibly setting the punching period of the press machine to the minimum punching period when the punching period of the press machine is shorter than the minimum punching period regulated by the timer device.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The mechanical configuration of the punching press according to this invention is similar to that of the conventional punching press shown in FIG. 4, and FIG. The block diagram, FIG. 2, is a time chart showing this control device and the timing of the axis movement and punching operation controlled by the control device.

As shown in FIG. 1, the control device 39 includes a main calculation section 25, a pulse distribution section 27, an axis movement motor drive section 29, a timer 31, a pulse distribution completion signal generation section 33, an AND circuit 35, and a press motor drive section. 3
It consists of 7. Note that the axis movement motor 23 and axis movement motor drive unit 29 shown in FIG. 1 are representative of the axis movement motors and axis movement motor drive units for the X-axis and the Y-axis.

The main calculation unit 25 of the control device 39 creates a command signal for axis movement based on input data from an NC tape, etc., and sends the created command signal to the pulse distribution unit 27.
This is what is output to.

The pulse distribution unit 27 distributes this axis movement command signal into pulse signals as appropriate, and outputs the distributed axis movement command signal to the axis movement motor drive unit 29.
Further, this pulse distribution section 27 outputs timer start information to the timer 31 at the same time as the distribution of the axis movement command signal starts, and simultaneously outputs pulse distribution completion information to the pulse distribution completion signal generation section 33 at the same time as the distribution of the axis movement command signal is completed. Output.

The axis movement command signal distributed by the pulse distribution unit 27 is input to the axis movement motor 23 via the axis movement motor drive unit 29, and drives the axis movement motor 23 to move the workpiece to a predetermined position. .

The timer 31 receives an appropriate delay time τ determined in consideration of the resonance frequency of the frame, etc. from the main calculation unit 25, and also inputs an appropriate delay time τ from the main calculation unit 25 to the pulse distribution unit 27.
The above-mentioned timer start signal is input from.
Therefore, the timer 31 is started when it receives a timer start signal from the pulse distribution section 27, and when the delay time τ has elapsed, it is turned on and the output becomes H level.

When the pulse distribution completion signal generation section 33 receives pulse distribution completion information from the pulse distribution section 27, it sets the output to H level.

Timer 31 and pulse distribution completion signal generator 33
The output signal of
The press motor 21 is driven via the press motor 21 to execute the punching operation.

A limit switch (not shown) is provided near the press ram 11 to detect the end of the punching operation of the press ram 11, and the output of this limit switch is input to the main calculation section 25. Therefore, when the one-cycle punching operation is completed, the detection signal of the limit switch is sent to the main processing unit 2.
5, and using this detection signal as a trigger, the main calculation unit 25 transmits the axis movement command signal to the pulse distribution unit 2.
7. The detection signal of the limit switch is also input to the timer 31 and the pulse distribution completion signal generation section 33 via a line (not shown), and at the same time as the one-cycle punching operation ends, the timer 31 and the pulse distribution completion signal generation section 3
I am trying to reset 3.

Next, the operation of this embodiment will be explained with reference to the time chart shown in FIG. In FIG. 2, time charts e, f, g, h, and i indicate time changes in the axis movement speed, timer output signal, pulse distribution completion signal, AND circuit output signal, and punching operation, respectively.

As already mentioned, the main calculation section 25 starts outputting the axis movement command signal using the detection signal from the limit switch that detects the completion of the one-cycle punching operation as a trigger. Therefore, the axis movement executed by the axis movement command signal from the main calculation unit 25 is started at the one-cycle punching operation end times t ₁ , t ₄ , and t ₇ as shown in the time chart e. The process ends at times t ₂ , t ₅ , and t ₉ when each predetermined axis movement is completed.

Next, referring to the time chart f, since the timer 31 starts at the same time as the axis movement starts and turns on after the delay time τ has elapsed, the timer output signal is generated at the axis movement start time t ₁ , t ₄ , It becomes H level at each time t ₃ , t ₆ , and t ₈ after the delay time τ has elapsed from t ₇ . Then, it returns to the L level at the time when the timer is reset by the signal from the limit switch, that is, at the one-cycle punching operation end times _t4 , _t7 , and _t10 .

As shown in time chart g, the pulse distribution completion signal becomes H level at the axis movement completion times t ₂ , t ₅ , and t ₉ based on the pulse distribution completion information from the pulse distribution section 27, and goes to the H level based on the detection signal from the limit switch. It returns to the L level at cycle punching operation end times t ₄ , t ₇ , and t ₁₀ .

Therefore, as shown in the time chart h, the AND circuit output signal is generated at times t ₃ , t ₆ , when the timer output signal and the pulse distribution completion signal simultaneously become H level.
It becomes H level at t ₇ and returns to L level at times t ₄ , t ₇ , and t ₁₀ .

As a result, the punching operation is started from times t ₃ , t ₆ , and t ₉ as shown in time chart i.
Time t ₄ , t ₇ , after execution of one-cycle punching operation
It ends at t ₁₀ .

In short, in this punching processing example, the first and second one-cycle punching operations, which require shorter axis movement times, are started at times _t3 and _t6 , which are slightly later than the axis movement completion times _t2 and _t5 , and the axis movement The third one-cycle punching operation, which takes a longer time, is started from the axis movement completion time _t9 , as in the conventional case. In other words, in this punching example,
The first and second punching periods are extended from the punching period determined by each axis movement time to the minimum punching period determined by the timer delay time τ, and the third punching period is determined by the axis movement time. This is a departure from the conventional punching cycle.

Therefore, according to this embodiment, if the punching period determined by the axis movement time is shorter than the timer delay time τ, the punching operation can be performed using the timer delay time τ as the period, and the opposite condition holds true. In this case, the punching operation can be performed at the punching cycle determined by the conventional axis movement time, so the resonance of the frame etc. caused by the punching operation can be reduced.
Also, troubles such as clutch and brake seizure can be prevented, and working time can be shortened as much as possible.

In the above embodiment, the timer delay time τ
When punching is performed with a shorter punching period, the punching period is always extended to the delay time of the timer. However, it is not necessary to do so. For example, when punching is performed with a shorter period than the delay time τ, A counter for counting the number of cycle punching is provided, and the punching period is not extended when the short-period punching is performed only once, but is configured to extend the punching period only when the short-period punching is performed multiple times. You can also. This not only prevents troubles such as resonance of the frame and seizure of the clutch and brake, but also further reduces the working time.

[Configuration of the invention] With the above configuration, the press machine of this invention can prevent the punching cycle from becoming excessively short, thereby reducing the resonance of the frame, etc. that accompanies the punching operation, and the clutch. ,
Troubles such as brake seizure can be prevented.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a control device according to an embodiment of the present invention, Fig. 2 is a time chart showing the control device and the timing of axis movement and punching operation, and Fig. 3 is an overall explanatory diagram of a conventional punching press. , FIG. 4 is a time chart showing changes over time in various axis movements in the conventional punching press. 11...Press ram, 21...Press motor,
23...Axis moving motor, 25...Main calculation unit, 27
... Pulse distribution section, 31 ... Timer, 33 ... Pulse distribution completion signal generation section, 35 ... AND circuit.

Claims (1)

[Scope of utility model registration request] A timer device is provided to regulate the minimum punching period, which is set in consideration of the relationship between the resonant frequency of the press machine and heat generation due to repetitive operation of clutches, brakes, etc., and the punching period of the press machine is set to the minimum punching period regulated by the timer device. A press machine, comprising: a control device that forcibly sets the punching cycle of the press machine to the minimum punching cycle if the punching cycle is shorter than the minimum punching cycle.