JPH0413500A - Press controller - Google Patents

Abstract

PURPOSE:To secure the high efficiency production and the safe operation by inhibiting forcibly the reactuation of a press unless a reactuation permitting signal is generated even if a press actuating signal is inputted. CONSTITUTION:A limited value of the number of allowable intermittent strokes corresponding to the number of continuous strokes is stored in a storage means 23. By a set time signal generating means 22, a set continuous stroke number signal is inputted and the limited value is specified by cooperating with the storage means 23, and a set time signal corresponding to the limited value is outputted. By a reactuation permitting signal generating means 24, a reactuation permitting signal is outputted after the time corresponding to the set time signal elapses from a press stop signal input time point. Even if a press actuating signal is inputted manually or inputted automatically, the reactuation of a press is inhibited forcibly unless the reactuation permitting signal is generated. In such a way, a severe operation can be prevented automatically in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a press control device that automatically makes sure that the allowable number of intermittent strokes is maintained.

[Prior Art] When the press is stopped by operating the brake while releasing the power transmission clutch, the kinetic energy of the crankshaft, etc. is converted into heat by the brake, raising the ambient temperature. Therefore, this not only has an adverse effect on the backlash of the seals and gear mechanisms, but also causes deterioration of brake performance.For this reason, a limit value for the number of allowable intermittent strokes is determined for each press.

Here, the allowable number of intermittent strokes is the number of strokes that can be allowed per minute in the case of intermittent operation (operation method that stops at top dead center every time), and in the low speed range, it is proportional to the number of continuous strokes, that is, the press speed. For example, as shown in FIG. 2, it decreases in medium and high speed ranges past a certain limit P.

The limit P varies depending on the press.

By the way, the conventional method for ensuring that this allowable number of intermittent strokes is observed during actual operation of the press is to specify it in a part of the instruction manual for the entire press, or to paste the graph shown in Figure 2 and its precautions on the press body, etc. The actual situation is whether it is operated based on the experience of the operator.

[Problem to be solved by the invention] However, in today's world, where there is a strong desire for higher speeds, such as exceeding 400 SPM, and for diversification, such as processing various products using the same press, arbitrary and arbitrary control by workers is becoming more and more difficult. If left to its own devices, combined with the demand for increased productivity, it is likely that operations will frequently exceed the allowable number of intermittent strokes. As a result, the repair and replacement of clutches and brakes is a factor that reduces overall production efficiency.

In addition, deterioration in brake performance is limited to mechanical problems and is permitted for operational safety reasons. In addition, it is increasingly being pointed out from a usage perspective that leaving the management of the allowable number of intermittent strokes to the operator is harsh because it places excessive mental stress on the operator.

Furthermore, in automatic continuous presses that are automated and labor-saving, the presses are often automatically started and stopped based on signals from an automatic transfer mechanism during various adjustment operations. Therefore, full attention must be paid to the movement and timing of the transfer mechanism itself, and the state in which the blank is held, resulting in a situation where the permissible number of intermittent strokes is easily managed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a press control device that can automatically manage the allowable number of intermittent strokes, ensure clutch brake protection, and prevent severe operation that exceeds the allowable number of intermittent strokes.

[Means for solving the problem] A storage means for storing a limit value of the allowable number of intermittent strokes corresponding to the number of continuous strokes, and a set continuous stroke number signal or a corresponding press speed signal is input and cooperates with the storage means. A set time signal generating means that specifies the limit value and outputs a set time signal corresponding to the limit value, and outputs a restart permission signal after a time corresponding to the set time signal has elapsed from the input point of the press stop signal. and a restart permission signal generating means configured to forcibly prevent the restart of the press unless the restart permission signal is generated even if the press start signal is input manually or automatically. do.

[Function] In the present invention, a limit value of the allowable number of intermittent strokes corresponding to the number of continuous strokes is set in advance in the storage means. Here, the set time signal generation means specifies the limit value from an input signal of the set continuous stroke number during actual press operation or a corresponding press speed having the same contents, and the limit value stored in the storage means. Directly or indirectly output a set time signal corresponding to the limit value. Then, the restart permission signal generating means outputs the restart permission signal after a period of time corresponding to the input set time signal has elapsed since the input of the press stop signal by the clutch off signal or the like.

Here, even if the press start signal is manually or automatically input, press restart is not allowed until the restart permission signal is generated, and restart is allowed only after the restart permission signal is generated.

Therefore, the allowable number of intermittent strokes should be set regardless of differences in press processing speed, product B machine, operator experience level, etc.
It can be automatically mandatory.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a preferred press control device for carrying out the present invention.

In FIG. 1, 1 is the main motor of the press, and controller 3. It is rotationally driven via a driver 2, and its rotational speed is defined by the setting value (setting signal E) of the press speed setting device 4. Setting the press speed is essentially equivalent to setting the number of consecutive strokes.

Further, 5 is a clutch brake, and 6 is a contact that is turned on when the clutch is turned off (brake is turned on). In this embodiment, it is assumed that the press stop signal STP is output when the contact 6 is turned ON. For convenience of explanation, the contact 6 is assumed to be output directly from the clutch brake 5, or output from another device such as the drive control panel 10 in the form of an auxiliary contact. Good too. Of course, the press stop signal STP is not limited to a contact signal.

Next, the drive control panel 10 stores electronic circuits etc. that drive and control the entire press, and a part of it includes a restart prevention circuit.
111 and announcement port #112 are provided.

Restart prevention circuit #111 is a circuit that does not permit press startup unless other interlock conditions are established even if contact 13 as a press startup signal PBX input manually or automatically is turned ON. A restart permission signal Ta, which will be described in detail later, is also considered as one of the interlock conditions.

On the other hand, even if the contact 14 of the same type as the contact 13 as the press start signal PBX is turned on, the notification circuit is operated as long as the restart permission signal Ta is not generated, that is, as long as the restart disallowance signal Tb is output. In other words, contact 26 or 0
This is a means of notifying the operator that restarting the press is not permitted in order to maintain the permissible number of intermittent strokes by sounding a buzzer or the like when the FFL is closed.

Here, an automatic monitoring panel 20 is provided that automatically monitors the allowable intermittent stroke number, and in this panel 20 there is an A/D converter that converts the analog press speed signal E set in the press speed setting device 4 into a digital signal. A D converter 21, a set time signal generation means 22, a memory hand Pi 23, and a restart permission signal generation means 24 are built in.

The storage means 23 is a means for storing a limit value of the number of allowable intermittent strokes corresponding to the press speed, that is, the number of continuous strokes, and is formed of a memory such as ROM or RAM. For example, the settings of the six stored contents stored as graphs and matrix tables shown in FIG. 2 can be changed.

Note that the allowable number of intermittent strokes is converted in advance to the allowable time interval from the time the press stops until the next press restart.
This can also be carried out by storing this time interval in the means 23.

Next, the set time signal generating means 22 inputs the set continuous stroke number signal or the corresponding press speed (E) and works with the storage means 23 to specify the limit value and generate a set time signal corresponding to the limit value. This is a means for outputting T.

In this embodiment, due to the relationship with the press speed setting device 4, the A/D
The press speed signal E is input to the converter 21.

Further, the digital signal from the A/D converter 21 is used as an address designation signal. Therefore, the means 22 specifies the limit value of the address specified by the digital signal among the limit values stored in the storage means 23, that is, the limit value equivalent to the number of allowable intermittent strokes corresponding to the number of continuous strokes, and in this case, This is converted into a permissible time interval required until the press is restarted in , and this permissible time interval take T (a timer setting value to the restart permission signal generating means 24) is output.

In addition, when the storage means 23 is formed to store in advance the allowable time interval determined from the allowable number of intermittent strokes as described above, the allowable time interval take T is directly stored based on the input address designation signal (D). It can be output to In this sense, the set time signal generation means 22 and the storage means 2
3 may be integrally configured as a function generator, for example.

Here, the means 22 is configured to always output the set time signal T to the means 24 at regular intervals or whenever the press speed signal E or the digital signal changes.

Further, the restart permission signal generating means 24 restarts after a time corresponding to the already input set time signal (timer setting value)' has elapsed from the time when the press stop signal STP was input. It is means for outputting the activation permission signal Ta, and in this embodiment, it is formed from a digital timer.

Further, the restart permission signal Ta is assumed to be output when the instantaneous operation time-limited return type auxiliary contact 25 is turned off. Therefore, the digital timer (24) generates a clutch off signal (contact 6 is OFF), which is the press stop signal STP.
The timer starts counting when N> is input, and outputs the restart permission signal Ta when the timer setting value (T) has elapsed. The signal Ta is input to the restart prevention circuit 11 as one of the interlock signals.

Furthermore, in this embodiment, a contact 2 which operates in the opposite manner to the contact 25 is used.
6 are provided, and while this contact 26 is ON, a restart disallowance signal Tb is output. The signal Tb is input to the notification circuit 12.

Next, the effect will be explained.

First, a limit value for the number of allowable intermittent strokes unique to the press is inputted into the storage means 23 by specifying an address. The address corresponds to the press speed signal (continuous stroke number signal) E.

Next, a desired speed (number of continuous strokes) is set in the press speed setting device 4, and the main motor 1 is driven to rotate.

Here, a drive control panel 1 forming a part of the press control device
0, press start manually or automatically. Then, the brake is released and the clutch (5) is turned on, and the slide moves one stroke and stops at top dead center. This stopping is performed by turning off the clutch and operating the brake.

Here, when the clutch is turned off, the contact 6 is turned on and the press stop signal STP is input to the restart permission signal generation means 24. Note that this means 24 receives the press speed signal E.
, a set time (timer set value) signal T specified on the basis of a digital (addressing) signal and in cooperation with the storage means 23 has already been input from the set time signal generating means 22 .

Once the restart permission signal generating means 24 counts the time from the time when the press stop signal STP is input, and before the set time (timer setting value) elapses, the restart permission signal generation means 24 generates the restart permission signal Tb (the contact 26 is ON). and output the set time (
After the timer setting value) has elapsed, the restart permission signal Ta (contact 2
5 is 0FF).

Here, the drive control panel 1 can be manually or automatically operated by the operator.
When the press start signal PBX is input to 0 (contacts 13 and 14 are closed), a restart permission signal Ta is output from the allowable intermittent stroke number automatic monitoring board 20 that forms part of the press control device, and other interfaces Only when the lock signal condition is established, the restart prevention circuit 11 is released and the next intermittent operation can be performed.

However, if the restart permission signal Ta is not output, that is, if the restart disallowance signal Tb is output, that is, restart prevention #111 is not canceled before the set time elapses, so the press restart is not possible. Permission is not granted even if other interlock signal conditions are met. In other words, it is possible to forcibly prevent the press from restarting.

At this time, the notification circuit 12 is activated by the restart disallowance signal Tb, and a buzzer or the like is used to notify the operator that the number of permissible intermittent strokes has been exceeded. Workers can clearly recognize this fact.

According to this embodiment, the storage means 23 stores the limit value of the number of allowable intermittent strokes, the set time signal generating means 22 cooperates with this means 23 and the like to output a set time signal, and the press stop A restart permission signal generating means 24 is provided which outputs a restart permission signal Ta from the signal STP and the set time signal T, and as long as the restart permission signal Ta is not output, the press will not be restarted even if the press start signal PBX is input. Since it is configured to forcibly prevent startup, the proper allowable number of intermittent strokes can be automatically maintained, ensuring the specified performance of the clutch brake 5, etc. over a long period of time, and achieving highly productive and safe press processing. can.

Additionally, regardless of changes in press speed settings, etc., a reasonable allowable number of intermittent strokes is automatically monitored, greatly reducing the mental burden on the operator and eliminating human errors such as burnout of the clutch play 45. can.

In addition, since the limit value of the number of allowable intermittent strokes stored in the storage means 23 can be set and changed, it is possible to perform optimal operation for the press and specific monitoring according to the press operation ¥1g, making it highly adaptable. It is wide.

In addition, the restart permission signal generating means 24 is configured to constantly update and output the restart setting time according to the number of consecutive strokes in real time in response to changes in press speed etc. It is extremely easy to handle and does not require any modification.

Further, the restart permission signal generating means 24 is also configured to output a restart disallowance signal Tb, and a notification time #112 is provided to notify the operator that restart is not permitted due to exceeding the allowable number of intermittent strokes. This configuration allows workers to be aware of this and make improvements, and it also avoids situations where workers are forced to stop unnecessary press operations or perform inspections and repairs, which also improves production efficiency as a whole. can.

Note that in the above embodiment, the storage means 23. Set time signal generation means 22. The restart permission signal generating means 24 and the like were configured as individual circuits, but these are, for example, CPU, RAM, R, etc. that form the drive control circuit of the entire press.
It can also be implemented by using OM etc. and constructing it with consideration of software methods.

[Effects of the Invention] According to the present invention, a storage means, a set time signal generation means, and a restart permission signal generation means are provided, and unless a restart permission signal is automatically generated to ensure that the permissible number of intermittent strokes is met. Since the press is configured to forcibly prevent the press from restarting, it is possible to provide an easy-to-use press control device that can fully protect the clutch brake and automatically prevent severe operation that exceeds the allowable number of intermittent strokes. This has the excellent effect of stably guaranteeing high efficiency production and safe operation over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a diagram for explaining the relationship between the number of continuous strokes and the allowable number of intermittent strokes. 61... Main motor, 4... Press speed setting device, 5... Clutch brake, 10... Drive control panel, 11... Restart prevention circuit, 12... Notification circuit, 20... Allowable intermittent stroke number automatic monitoring panel, 21...
- A/D converter, 22... Setting time signal generation means, 23... Storage means, 24... Restart permission signal generation means, E... Press speed (number of continuous strokes) signal, T.・
- Setting time (timer setting value) signal, Ta...Press restart permission signal, STP...Press stop signal, PBX...Press start signal. Figure 2

Claims (1)

[Claims] (1) A storage means for storing a limit value of the allowable number of intermittent strokes corresponding to the number of continuous strokes, and a set continuous stroke number signal or a corresponding press speed signal is input and cooperates with the storage means to specify the limit value. and a set time signal generating means for outputting a set time signal corresponding to the limit value, and a restart permission signal generator for outputting a restart permission signal after a time corresponding to the set time signal has elapsed from the input point of the press stop signal. A press control device comprising means for forcibly preventing restart of the press unless the restart permission signal is generated even if a press start signal is input manually or automatically.