JPH09225696A - Timing switch foe high speed press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To synchronize a device having actuation delay with a slide by outputting an electric signal obtd, from a corrected crank angle obtained from an angle advancing time set beforehand and an accumulated rotation angle of a crank shaft and an actual crank angle. SOLUTION: Based on an ON/OFF signal (a) of a clutch and a crank angle signal (b) from an encoder 2 of press machine, an electric signal (c) is outputted from a timing controller 3. In the timing switch 1, an elapsed time and an accumulated rotation angle of the crank shaft are stored beforehand at intervals of a fixed tome from the time when a clutch ON signal is generated. Also, an angle advancing time is set and stored beforehand. Successively, the accumulated rotation angle, which corresponds to the elapsed time from a time when generating a clutch ON signal, is obtained. Further, the accumulated rotation angle, which corresponds to the elapsed time obtd, by adding the angle advancing time to this elapsed time, is obtained. Rotation angle deviation as difference between these two accumulated rotation angles is subtracted from the crank angle set beforehand, and the signal (c) is outputted based on the obtained corrected crank angle and the actual crank angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The number of strokes per minute is about 1.
It is used as a timing switch that outputs an electric signal at an appropriate timing even in a transient state when the slide is started and stopped in a high-speed press of 00 times or more.

[0002]

2. Description of the Related Art A press machine is provided with a timing switch for outputting an electric signal at a preset crank angle. Some of the timing switches can output an electric signal at a crank angle at a time when the number of strokes per minute of the press machine changes corresponding to the change, and the crank angle is shifted before the set crank angle.

[0003]

However, until the clutch ON signal is output and the press machine changes from the stopped state to the steady operation state, and until the clutch OFF signal is output and the steady operation state changes to the stop state. In the transitional state of No., if an electric signal is output by performing processing to shift the crank angle before the set crank angle, the device that needs to operate in conjunction with the slide of the press machine cannot operate at the required timing. There was a problem to say.

In such a transitional state, the change in the number of strokes per minute is large, and since the number of strokes per minute is calculated from the crank angle of the encoder output, a completely different stroke per minute is obtained at the time of completion of the processing. Because of the number, the timing was off. In other words, in a press machine in which this transient state is about a few degrees in crank angle,
Although it is not a significant problem, it cannot be ignored in the case of a crank angle of several hundred degrees, that is, in a high-speed press, and therefore, in the timing switch of the related art, there are cases where the press machine cannot be equipped with a device that is linked with an electric signal.

[0005]

The press machine is provided with an encoder, which detects and outputs the current crank angle. The timing control device to which the clutch ON signal or the clutch OFF signal of the press machine and the crank angle of the encoder output are input, the accumulated rotation angle of the crankshaft at every fixed time from the generation of the clutch ON signal or the clutch OFF signal. Is stored in advance, and the advance time, which is the time for accelerating the output of the electric signal of the timing switch, is also preset and stored.

This timing control device has a clutch ON.
When a signal or an OFF signal is input, based on the elapsed time from the signal, the stored cumulative rotation angle of the crankshaft, the elapsed time and the advance time,
The cumulative rotation angle at the time point after the advance time is obtained, and the deviation rotation angle which is the difference between the two cumulative rotation angles is obtained.

Since the corrected crank angle obtained by subtracting the deviation rotation angle from the preset crank angle is obtained, and the electric signal of the timing switch is output according to the corrected crank angle and the actual crank angle, the clutch ON signal and the clutch ON signal are output. An electric signal is output at an appropriate timing even in a transient state immediately after the OFF signal. It goes without saying that if the advance time is set to zero and stored, an electric signal can be output at a preset crank angle.

The timing controller obtains the number of strokes per minute of the slide from the speed signal of the drive source of the slide of the press machine or the crank angle of the encoder output. When the clutch is ON, the number of strokes per minute is obtained. When it becomes a constant state, it is judged that the transient state from the clutch ON is completed, and it operates in the state of the timing switch of the prior art, and in the case of the clutch OFF, when the number of strokes per minute becomes zero, the clutch OFF Judge that the transient state is completed.

In a press machine in which the number of strokes per minute of the slide is variable, the cumulative rotation angle of the crankshaft is stored in advance for each number of strokes per minute, and every time the number of strokes per minute coincides with the number of strokes per minute in a steady operation state in which the actual operation is performed. Use the cumulative rotation angle of the number of minute strokes. The memory of this cumulative rotation angle
Instead of storing the number of strokes per minute, a plurality of strokes per minute may be stored, and a cumulative rotation angle of the stored number of strokes per minute that is close to the actual number of strokes per minute may be used.

When the present invention is used for a press machine in which the number of strokes per minute of the slide is fixed and for a variable press machine on the clutch ON signal side, a motor for driving the slide of the press machine or the like is used. When the present invention is used only on the clutch 0FF side from the speed signal of the drive source, the timing control device determines from the crank angle of the encoder output.

[0011]

The preset crank angle is corrected by the advance angle obtained from the accumulated rotation angle of the crank shaft stored in advance and the delay time of the device having the operation delay time, that is, the advance angle time, and the timing switch is performed with the corrected crank angle. Since the electric signal is output, the timing of the device that operates in synchronization with the slide of the press machine does not change.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
This will be described below. FIG. 1 is a block diagram of a high-speed press timing switch 1, which includes an encoder 2 and
The timing control device 3 is provided, and the 0N / OFF signal a of the clutch of the press machine (not shown) and the crank angle b of the encoder output are input, and the electrical signal c is output. A variable speed press machine capable of changing the number of strokes per minute of a slide may be configured by adding a speed signal d of a drive source of the slide of this press machine. As the speed signal d, for example, a signal from a speed setting device of the motor or a signal from a speed detector of the motor, which is a drive source of the slide, is used.

FIG. 2 shows an example of a state before and after the clutch ON signal is generated. FIG. 2A shows a case where the clutch ON signal is generated at time A, and FIG. The number of strokes per minute until the number of strokes per minute S reaches S0 is shown in FIG.
2 shows the cumulative rotation angle Q of the crankshaft when S0 is S0.
(D) shows the deviation rotation angle P when the number of strokes per minute S of the slide is S0. The cumulative rotation angle Q1 at the elapsed time T1 and the deviation rotation angle P1 at the elapsed time T1 obtained from the cumulative rotation angle Q2 after the advance time T0 after the elapsed time T1 are shown.

FIG. 3 shows an example of states before and after the clutch OFF signal is generated. FIG. 3A shows a case where the clutch OFF signal is generated at time B.
(B) shows the number of strokes per minute S of the slide until it stops from S0, FIG. 3 (c) shows the cumulative rotation angle Q of the crankshaft, and FIG. 3 (d) shows the deviation rotation angle P. Shows. The cumulative rotation angle Q3 at the elapsed time T2,
The deviation rotation angle P2 at the elapsed time T2 obtained from the cumulative rotation angle Q4 after the advance time T0 from the elapsed time T2 is shown.

FIG. 4 shows the output timing of the electric signal of the timing switch. In FIG. 4A, after the lapse of T1 time after the clutch ON signal is generated, the corrected crank angle obtained by subtracting the deviation rotation angle P1 from the crank angle A0 set in the timing switch 1 is A1. At this time, if the actual crank angle is A1, the timing switch 1 outputs the electric signal c.

In FIG. 4 (b), the crank angle obtained by subtracting the deviation rotation angle P2 from the crank angle A0 set in the timing switch 1 is A2 after the lapse of T2 time after the clutch OFF signal is generated. At this time, when the actual crank angle is A2, the timing switch 1 outputs the electric signal c.

The devices that need to be operated in synchronism with the slide motion of the press machine have been operated mechanically in the past, but recently, those which are operated in an electrical interlock have been increasing. There is. These devices that operate electrically in synchronism are ON / OFF controlled by a timing switch that outputs an electric signal in synchronization with the operation of the slide of the press machine, that is, in synchronization with the crankshaft.

However, since these devices have a delay in operation, the ON / OF of the electrical signal of the timing switch is turned on.
There is a timing switch with an advance angle that outputs the F output at a time point before the set crank angle in accordance with the number of strokes per minute of the slide, that is, the rotation speed of the crankshaft in consideration of this delay.

This timing switch with an advance angle calculates the number of strokes per minute of the slide by calculating from the crank angle of the encoder output. This is obtained from the amount of change in the crank angle over a fixed time or the time required for the amount of change in the constant crank angle. In the transitional state from clutch ON or clutch OFF to the stable state, the change in the number of strokes per minute of the slide is large, and thus the calculated value and the actual value greatly differ.

Further, the rotation angle of the crankshaft, which corresponds to the advance time, that is, the advance angle cannot be obtained because the advance angle value cannot be correctly obtained because the advance angle must be obtained from the number of strokes per minute. In the transitional state between the stopped state and the steady operation state, the timing switch of the related art has a problem that the timing does not match.

In order to solve such a problem, in addition to the conventional technique of obtaining the advance angle from the number of strokes per minute of the slide,
The present invention is a clutch ON signal or a clutch OFF
In the transient state from the signal, the advance angle is obtained from the elapsed time from the clutch ON signal or the clutch OFF signal and the cumulative rotation angle of the crankshaft up to that time, while in the steady operation state, the advance angle is obtained by the conventional technique. Outputs an electric signal of the timing switch.

Clutch ON signal or clutch OF
The change in the crankshaft rotation speed during the transient state from the F signal causes the individual press machines other than the special press machines such as the stroke length of the slide to change, so that the speed changes. Instead, there is no problem even if the time is elapsed.

[0023]

When the slide of the press machine is in a transitional state between the stopped state and the steady operation state, the elapsed time from the clutch ON signal or the clutch OFF signal and the cumulative rotation angle of the crankshaft of the press machine up to that time. The lead angle is obtained from the lead angle time, and in the steady operation state, the lead angle is obtained from the number of strokes per minute of the slide, and the electrical signal of the timing switch is output according to either one of the lead angles and the set crank angle. It is possible to operate the device having a delay in operation and the slide in synchronization.

[Brief description of drawings]

FIG. 1 is a block diagram showing the main configuration of the present invention.

FIG. 2 is an explanatory diagram of states before and after a clutch ON signal is generated according to the present invention.

FIG. 3 is an explanatory diagram of states before and after a clutch OFF signal is generated according to the present invention.

FIG. 4 is an explanatory diagram showing an output timing of an electric signal of the present invention.

[Explanation of symbols]

1 is a timing switch, 2 is an encoder, 3 is a timing control device, and a is a clutch ON / OFF of the press machine.
An OFF signal, b is a crank angle signal of the press machine, c is an output of an electric signal, and d is a speed signal of a slide drive source of the press machine.

Claims (3)

[Claims] 1. A high-speed press timing switch for outputting an electric signal at a preset crank angle, an encoder rotating synchronously with a crankshaft, a clutch ON signal of a press machine, and a speed signal of a drive source of a slide of a press machine. And a means for outputting at least one electric signal, and a means for obtaining the number of strokes per minute of the slide from the crank angle of the encoder output and the speed signal of the drive source of the slide. . The timing at which the electrical signal of the timing switch is output at an angle shifted in advance from the preset crank angle during the transient state from the stopped state to the steady operation state of the press machine by the clutch ON signal. The control device stores (a) the elapsed time and the cumulative rotation angle of the crankshaft in advance at regular intervals after the clutch ON signal is generated. (B) The advance time, which is the time to accelerate the output of the electric signal of the timing switch, is set and stored in advance. (C) Obtaining the cumulative rotation angle corresponding to the elapsed time from the clutch ON signal and the advance time to the elapsed time to obtain the cumulative rotation angle corresponding to the added elapsed time, The deviation rotation angle that is the difference between the two accumulated rotation angles is obtained. (D) A corrected crank angle obtained by subtracting the deviation rotation angle from the crank angle preset in the timing switch is obtained, and an electric signal of the timing switch is output based on the corrected crank angle and the actual crank angle. Timing switch for high-speed press characterized by the above. 2. A high-speed press timing switch that outputs an electric signal at a preset crank angle, comprising at least an encoder that rotates in synchronization with a crankshaft, a clutch OFF signal of a press machine, and a timing control device. It has means for outputting one electric signal, and means for obtaining the number of strokes per minute of the slide from the crank angle of the encoder output. The timing control device that outputs the electric signal of the timing switch at a previously shifted angle with respect to a preset crank angle from the steady operation state to the stopped state of the press machine with the clutch OFF signal, (A) At every fixed time after the clutch OFF signal is generated,
The elapsed time and the cumulative rotation angle of the crankshaft are stored in advance. (B) The advance time, which is the time to accelerate the output of the electric signal of the timing switch, is set and stored in advance. (C) The cumulative rotation angle corresponding to the elapsed time from the clutch OFF signal and the cumulative rotation angle corresponding to the elapsed time obtained by adding the advance time to the elapsed time are obtained, and the two accumulated values are accumulated. The deviation rotation angle, which is the difference between the rotation angles, is obtained. (D) A corrected crank angle obtained by subtracting the deviation rotation angle from the crank angle preset in the timing switch is obtained, and an electric signal of the timing switch is output based on the corrected crank angle and the actual crank angle. Timing switch for high-speed press characterized by the above. 3. The deviation rotation angle according to claim 1 or 2, instead of storing the cumulative rotation angle of the crankshaft for every fixed time from the clutch ON signal or the clutch OFF signal. The high-speed press is characterized in that the corrected crank angle obtained by subtracting the deviation rotation angle from the preset crank angle is obtained, and the electric signal of the timing switch is output based on the corrected crank angle and the actual crank angle. Timing switch.