JPS63299900A - Method and apparatus for adjusting die height in press machine - Google Patents

Abstract

PURPOSE:To improve dynamic accuracy of a press by detecting bottom dead center position of a slide through a sensor, comparing the setting reference value and adjusting die height based on the difference between the detected value and the setting value. CONSTITUTION:The sensor 47 detecting the bottom dead center position of the slide 7 is arranged to upper part sub-plate 15 fitted to lower part of the slide 7 of the press. When the bottom dead center position of the slide 7 as the actual displacement of the die height is detected through the sensor 47, the detecting signal is inputted to a peak holding circuit 53 in an adjusting control device 51. A comparator 55 is compared with the setting value of the bottom dead center position, and based on this difference, the pressure of the oil hydraulic pressure chamber 41 is adjusted, to finely adjust the die height. As the die height can be adjusted through the sensor 47 during driving the press, the dynamic accuracy of the press is improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method and device for adjusting die height in a press machine, and more specifically to adjusting minute changes in die height due to elongation due to heat etc. of a slide. The present invention relates to a die height adjustment method and device.

(Prior Art) Conventionally, a die height adjustment device for adjusting the position of the lower surface of a slide and the upper surface of a bolster in a press machine has been used.
A known method is to slightly turn a screw attached to a slide using an azirest motor before operating the press machine.

(Problems to be Solved by the Invention) Incidentally, during the operation of a press machine, the slide often stretches slightly in the vertical direction due to the influence of elongation of the frame and connecting rod due to heat or the like. However, while the press machine is in operation, it is not possible to adjust the elongation of the slide, that is, the change in die height, and the only option that can be adjusted is the change in the vertical direction of the slide when the press machine is stopped. Therefore, even if the die height slightly changes while the press machine is in operation, it cannot be adjusted during operation and press processing is performed in that state, which poses a problem in terms of dynamic accuracy.

The purpose of the present invention is to improve the above-mentioned problems by making it possible to adjust minute changes in die height even while the press machine is in operation.
An object of the present invention is to provide a die height adjustment method and device for a press machine that improves dynamic accuracy.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the first invention provides a connecting rod that can freely move up and down in a press machine or a connecting member connected to the connecting rod. This is a die height adjustment method for a press machine in which the die height is adjusted to 1 by controlling the deformation RI of the minute deformation adjustment means interposed between the slide and the slide.

The second invention is a die height adjusting device for adjusting the distance between the lower surface of a slide and the upper surface of a bolster in a press machine, and the slide is provided with a sensor ν for detecting the bottom dead center position of the slide. A comparison section is provided to compare the actual detection value of the bottom dead center position of the slide detected by the sensor with a set value that is set in advance for the bottom dead center position of the slide, and the comparison section compares the detected value and the set value. A press machine is provided with an arithmetic processing unit that performs arithmetic processing on the slide displacement ω based on the difference between This is a die height adjustment device.

(Function) By adopting the present invention, the dead center position of the slide is detected while the press machine is operating, and the detected value is compared with a preset value to detect a minute change in die height.
The die height is adjusted by adjusting, for example, an overload protector cylinder based on the minute amount of change.

Therefore, changes in die height during operation of the press machine are adjusted, and dynamic accuracy is improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, a slide 7 that moves up and down along slide guides 5A and 5B is provided on the upper part of the frame 3 of the press machine 1. This slide 7 is provided with a die height adjustment device 11 that is interlocked with the crankshaft 9, and one end of the crankshaft 9 is connected to a gear mechanism 13.
It is operatively connected to a drive device (not shown) via.

An upper sub-plate 15 having an upper die (not shown) is detachably attached to the lower surface of the slide 7.

Further, a bed 17 is integrally attached to the lower part of the frame 3, and a bolster 21 on which a lower rib plate 19 having a lower mold (not shown) is removably mounted is mounted on the bed 17. It is placed.

As shown in FIG. 2, one end of a connecting rod 25, which is a part of the die height adjustment device 11, is rotatably inserted into the crankshaft 9, which is rotatably supported by the frame 3 via bearings 23A and 23B. has been done. The inside of the other end of the connecting rod 25 is hollow, and a female threaded portion 25A is carved on the inner peripheral surface of the hollow portion.

A connecting screw 27 is installed in the hollow portion of the connecting rod 25 . A male threaded portion 27A is formed on the outer peripheral surface of the upper portion of the connecting screw 27, and the male threaded portion 27A is screwed into the female threaded portion 25A of the connecting rod 25. A spherical portion 27B is integrally provided at the bottom of the connecting screw 27.

A connecting member 31 is connected to the spherical portion 27B via a split-shaped engagement member 29 that is to be engaged with the spherical portion 27B. A gear 3 is mounted on the cylindrical upper part of the connecting member 31.
3 is inserted. A cylindrical member 35 is fitted into the upper end portion of the continuous member 31 to hold down the gear 33, and is attached to the frame 3.

With the above configuration, by rotating the gear r33, the connecting member 31. Connecting gear 2 via engagement member 29
The spherical portion 27B of No. 7 is rotated.

By rotating the spherical portion 27B, the height of the connecting screw 27 with respect to the connecting rod 25 is adjusted, and the die height is adjusted.

The slide 7 is attached to the lower part of the connecting member 31. Between the connecting member 31 and the slide 7, an overload protector cylinder 37 as an adjustment means made of an elastic member as an overload safety device and its piston rod 39 are provided.
9 is screwed into the connecting member 31 by a screw.

A hydraulic chamber 41 is formed within the overload protector cylinder 37, and the slide 7 and piston rod 39
A chamber 43 formed between the two serves as a tank. A pump 45 is attached to one side wall of the chamber 43, and the pump 43 sucks up oil stored in the chamber 43 and sends it into the hydraulic chamber 41 to prevent overload.

Pressure oil in the hydraulic chamber 41 is returned to the chamber 43 through an oil passage (not shown).

A sensor 47, such as a proximity switch, for detecting the bottom dead center position of the slide 7 is attached to one side wall of the upper sub-plate 15 attached to the lower part of the slide 7. On the other hand, a gauge block 49, for example, is attached to one side wall of the lower sub-plate 19 that corresponds to one side wall of the upper sub-plate 15 to which the sensor 47 is attached.

With the above configuration, the lower surface position of the upper sub-plate 15 attached to the lower part of the slide 7 when the slide 7 is lowered in FIG.
9.

When the press machine 1 is operated, the slide 7 is moved up and down between the bottom dead center position and the F dead center position. While the slide 7 is moving up and down, the frame 3, connecting rod 25, etc. are expanded due to heat or the like. The elongation is the connecting member 31
．． The slide 7 will extend via the piston rod 39 and the overload protector cylinder 37. As a first embodiment for adjusting the extension of the slide 7, the extension of the overload protector cylinder 37 is performed by controlling the hydraulic pressure of the hydraulic chamber 41. The hydraulic pressure in the hydraulic chamber 41 is controlled by converting the air pressure of the pump 45 into a current value and by changing the current value.

That is, as a result of various tests assuming that the displacement m of the die height is the elongation of the overload protector cylinder 37,
As shown in FIG. 3, it is recognized that the relationship between the Guihide displacement amount and the air pressure supplied by the pump 45 is approximately proportional. The die height displacement amount is adjusted and controlled based on the relationship between the die height displacement amount and the air pressure supplied by the pump 45.

As shown in FIG. 4, an adjustment control device 51 that adjusts and controls the amount of displacement of the die height includes a sensor 47 and a pump 45.
It is connected to the. The sensor 47 detects the bottom dead center position of the slide 7, which is the actual displacement of the bite. The detection signal is input to the peak hold circuit 53. The peak hold circuit 53 processes the maximum value of the detection signal as a peak hold value P, and the peak hold value P is taken into the comparison section 55.

The set value memory 57 stores in advance a set value T at which the slide 7 should descend to reach the bottom dead center position. Since the setting value T stored in the setting value memory 57 has already been taken into the comparing section 55, the peak bold value P and the setting value T are compared in the comparing section 55. The comparison result is sent to the arithmetic processing unit 59, and the arithmetic processing unit 59 performs arithmetic processing of ΔP+=PT when P>1′.

Further, in the case of P<], the calculation process of ΔP2=TP is performed.

This determined ΔP1. Based on the value of ΔP2 and the proportional relationship shown in FIG. 3, the pump 45 is given ΔPI,
By supplying or handling air pressure corresponding to ΔP2, the hydraulic pressure in the hydraulic chamber 41 in the overload protector cylinder 37 is adjusted, and the die height is adjusted.

In this way, while the press machine 1 is operating, the hydraulic chamber 4 in the overload protector cylinder 37 is controlled by actually detecting the bottom dead center position of the slide 7 by the sensor 47.
Since the die height can be adjusted by adjusting the hydraulic pressure of the press machine 1, dynamic accuracy can be improved without stopping the press machine 1.

As a second embodiment, as shown in FIG. 5, a plurality of ceramic actuators 61, for example two piezoelectric elements, are provided between the overload protector cylinder 37 and the slide 7.
is provided, and the elongation of the overload protector cylinder 37 in the vertical direction is detected as a voltage. In this case as well, by connecting the ceramic actuator 61 instead of the pump 45 in FIG. 4, the vertical extension of the overload protector cylinder 37 can be controlled and the same effect can be achieved, so a detailed explanation will be omitted.

Note that the present invention is not limited to the above-mentioned embodiments,
By making appropriate changes, other embodiments can be implemented.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, for example, the bottom dead center position of the slide is detected while the press machine is operating, and the detected value is set in advance. A minute change in the die height is detected by comparing it with the value, and the die height is adjusted by adjusting the extension of the overload protector cylinder based on the minute change. Therefore, the die height can be adjusted even while the press machine is in operation, improving dynamic accuracy.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a press machine according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing a die height adjustment device, and Fig. 3 shows the relationship between the air pressure supplied by the pump and the die height displacement 1. The graph shown in FIG. 4 is a block diagram showing an adjustment control device that performs die height adjustment. FIG. 5 is a diagram showing another embodiment of the die height adjusting device in place of FIG. 2. [Explanation of symbols representing main parts of drawings] 1...Press machine 7...Slide 11...Die height adjustment device 21...Bolster 37...Overload protector cylinder 39...Piston rod 41 ... Hydraulic chamber 45 ... Pump 47 ... Sensor 49 ... Gauge block 51 ... Adjustment control device 53 ... Peak hold circuit 55 ... Comparison section 57 ... Set value memory 59.・・・
Arithmetic processing unit 61...Ceramic actuator agent Yasuo Miyoshi, patent attorney Figure 1 Supply air pressure (wcm") Figure 3, 51 411

Claims (4)

[Claims] (1) The die height is adjusted by controlling the amount of deformation of a minute deformation adjusting means interposed between a vertically movable connecting rod or a connecting member connected to the connecting rod and a slide in a press machine. How to adjust the die height of a press machine. (2) A die height adjustment device that adjusts the distance between the lower surface of the slide and the upper surface of the bolster in a press machine, and a sensor for detecting the bottom dead center position of the slide is provided on the slide, and the sensor detects the position of the slide. A comparison section is provided that compares the actual detection value of the bottom dead center position with a set value that has previously set the bottom dead center position of the slide, and based on the difference between the detected value and the set value compared by the comparison section. A press machine comprising: a calculation processing section for calculating the amount of displacement of the slide; and adjustment means for finely adjusting the slide in the vertical direction based on the amount of change in the slide processed by the calculation processing section. Die height adjustment device. (3) The press according to claim 2, wherein the adjusting means comprises an overload protector cylinder that is not interposed between the connecting rod or the connecting member connected to the connecting rod and the slide. Mechanical die height adjustment device. (4) The die height of the press machine according to claim 2, characterized in that the adjusting means comprises a piezoelectric element interposed between a connecting rod or a connecting member connected to the connecting rod and a slide. Adjustment device.