JPS6360100A - Automatic correction device for die height of press machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a die height 1 automatic correction device for a press gripping machine.

(Prior art and its problems) In the press industry, for example, as shown in the graph of FIG.
It fluctuates by about a+. This occurs due to changes in the temperature of the machine during operation, and even after the temperature of the machine becomes constant, it fluctuates due to changes in the outside temperature, for example. Therefore, it is necessary to correct the die height during operation.

For this reason, a device for mechanically fine-tuning the slide has been proposed (Utility Application No. 58-124465,
Jitsugan Sho 58-133530. Actual application 1986-96029>
However, since a special fine adjustment machine is used, there are problems in that the cost is high and the total clearance becomes large.

Therefore, the present invention does not require a special fine adjustment Ij structure, and
To provide an automatic die height correction device for a single press that is low in cost and does not increase the overall clearance.

(Structure of the Invention) The automatic die height correction device for a press machine related to Kikomei is:
Detects the die height, compares the detected die height with a preset standard die height, and calculates the deviation between the two.
The number of strokes is determined based on the determined deviation.

(Function) According to the automatic die height correction device for a press machine according to the present invention, since the number of strokes is controlled based on the above deviation, the number of strokes changes as shown in the graph of FIG. 4. The width difference can be made zero by correcting the die height.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows an embodiment of an automatic die height correction device for a breathable machine according to the present invention.

In the same figure, slide 1 and bolster 2 have an upper mold 3.
and a lower mold 4 are each fixed, and a displacement sensor 5 is disposed at the ends of the upper mold 3 and the lower mold 4. This displacement sensor 5 is, for example, an eddy current displacement sensor, detects a distance 1 between the upper die 3 and the lower die 4, and applies a signal indicating this distance 1 to the bottom dead center position detector 6. When the bottom dead center position detector 6 inputs this (No. 8), the distance 1flltJtj and the upper mold 3
A slide bottom dead center A is detected based on each known thickness of the lower die 4 and a signal indicating this slide bottom dead center A is applied to the comparator 7. On the other hand, the reference point setter 8 shows a reference point A' indicating the bottom dead center of the slide at the reference die height that is set in advance before operating the press machine.
Comparison 2 shows the signal indicating reference point A' from ! Added to A7. When the comparator 7 receives a signal indicating the slide bottom dead center A and a signal indicating the reference point A', it compares the slide bottom dead center with the reference point A' and calculates the positional deviation between the two. A command signal regarding the number of strokes is applied to the loaf number a device 9 to the step 1 in accordance with the number of strokes.

Here, as shown in the block diagram of Fig. 2,
When the comparator 7 compares the slide bottom dead center with the reference point A', in step 101), if the slide bottom dead center A is above the reference point A' and a positional deviation occurs upward,
Since the die height is smaller than the reference die height, the comparator 7 applies a command signal indicating a decrease in the stroke number to the stroke number control device 9 (step 102). When the control device 9 receives this command signal,
The rotational speed of the main sweater 10 for driving the slide 1 is reduced (step 103).

As a result, the die height increases as the stroke number decreases (step 10), as shown in the graph of FIG.
4) The above positional deviation becomes zero.

Furthermore, from the comparison with the above-mentioned block 101, if no positional deviation occurs, the die-high I is not fluctuating, so the comparator 7 sends a command @ indicating the maintenance of the stroke number to the control B position 9. Added (Stella.

105). When the control device 9 receives this command signal, it maintains the rotation speed of the main motor 10 (step 10).
G). As a result, the die height is kept constant (step 107). Furthermore, from the comparison in step 101 above, if the slide bottom dead center A is below the reference point A' and a positional deviation occurs downward, the die height is larger than the reference die height, so the comparator 7, a command signal indicating an increase in the number of strokes is applied to the control device 9 (step 108). When the control uD device 9 receives this command signal, it increases the rotation speed of the main motor 10 (
Step 109). As a result, the die height decreases as the stroke number increases (step 110), as shown in the graph of FIG. 4, and the positional deviation becomes zero.

Therefore, die high 1~ during operation of press Rwi is as follows:
For example, as shown in the graph of FIG.
It only fluctuates within the following range, and as shown in the graph of FIG. 3, it does not vary greatly with operating time.

In the above embodiment, the bottom dead center of the slide corresponding to the die height is detected, but the die height may be directly detected. In this case, for example, Magnescale can be used for detection.

(Effect between lights) As explained above, according to the present invention, the number of strokes is controlled based on the deviation between the detected die height and a preset reference die height, thereby correcting the die height. Therefore, it is possible to provide an automatic die height correction device for a press 11 machine that does not require a special fine adjustment gate mechanism, is low in cost, and does not increase the overall clearance.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of an automatic die height correction device for a press machine according to the present invention, and Fig. 2 is a block diagram used to explain the operation of the embodiment shown in Fig. 1. Diagram: Figure 3 is a graph showing die height variation with operating time, Figure 4 is a graph showing die height characteristics with respect to stroke number, and Figure 5 is a graph showing die height dynamic characteristics in the example shown in Figure 1. It is a graph. 1...Slider, 2...Bolster, 3...Upper mold,
4... Lower die, 5... Displacement sensor, 6... Bottom dead center detector, 7... Comparator, 8... Reference point setter, 9...
- Stroke number control device, 10...main motor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] Detection means for detecting die height; Comparison means for determining the deviation between the die height detected by the detection means and a preset reference die height; and Stroke detection means based on the deviation determined by the comparison means. An automatic die height correction device for a press machine, characterized in that it is equipped with a control means for controlling the number of die heights.