JP2503182Y2 - Press die thermal displacement compensator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a high-speed press for punching a band-shaped material at high speed and controlling the position of its dynamic bottom dead center using a sensor.

[Prior Art] FIG. 2 shows an overall configuration diagram of a conventional press having a bottom dead center automatic control function, and FIG. 3 shows a detailed view of the periphery of a conventional die. This example shows a crank type press. In these figures, the main motor 12 causes the slide 1 to reciprocate up and down through the crankshaft 13, and the upper die 3 attached to the slide 1 and the lower die installed on the bolster 2. The material 6 is punched, bent, coined, etc. by the action of the die 4 and the stripper plate 5. In this case, the slide 1 of the slide 1 is affected by fluctuations in the rotational speed of the main motor 12 and thermal displacement of mechanical components. The position of the dynamic bottom point (dynamic bottom dead center) changes, and the precision of the product changes in the case of bushing or bending, which causes inconvenience. For this reason some presses are second
As shown in the figure, the bottom dead center automatic control function is provided to automatically control the slide bottom point position within a certain accuracy range to prevent changes in product accuracy over time. In the case of this example, a target 8'is attached at an arbitrary position on one end of the lower surface of the slide 1 and a sensor (in this case, non-contact type) 9'mounted on an upper portion of a sensor support base 7'installed on the bolster 2.
The dynamic lowest point position of the slide 1 for each stroke is detected by this (the change of the gap Δ between the sensor 9'and the target 8'is detected) and the moving average value of a certain stroke exceeds the allowable fluctuation range. The microcomputer issues a command by the microcomputer arithmetic processing built in the operation panel 14 and controls the servo motor 11 so that the bottom dead center position is immediately returned to within the allowable range. However, in this method, the thermal displacement of the components of the press, that is, the displacement between the upper surface of the bolster 2 and the lower surface of the slide 1, and the amount of fluctuation are only detected. The thermal displacement of the mold 4 and the bushing or coining punch 10 is neglected. When the mold becomes large, the influence of the thermal displacement of the mold on the product accuracy (the amount of combing, the amount of coining, the bending height, etc.) cannot be ignored, and for products that require high accuracy, even small molds can be used. It becomes a problem.

[Problems to be solved by the device]

By the way, in the prior art as described above, since the thermal displacement of the die is ignored in the bottom dead center control, the thermal displacement of the die depends on the bushings printed on the actual product, the coining amount, the bending height, etc. Appeared as a change over time, which was a problem in terms of product accuracy.

That is, in the case of bushing, coining and bending, the lowest point position of the coining punch 10 determines the product accuracy, so it is ideal to detect and control this lowest point position. However, there is a problem that it is difficult to detect the pressure and becomes a neck of the press with the bottom dead center control.

[Means for solving the problem]

In order to solve the above-mentioned inconvenience, the die thermal displacement compensating device of the present invention detects the dynamic bottom dead center position of the reciprocating slide with a sensor and adjusts the bottom dead center position within a certain accuracy range. In the bottom dead center automatic control press, the lower die and the lower die of the upper die and the lower die via the sensor mounting base of the same material as the punch in one of the upper die and the lower die that face each other vertically. A non-contact bottom dead center detection sensor for detecting displacement (distance) of the upper surface, and a target are attached to the other mold so as to face each other.

[Action]

The die thermal displacement compensating device of the press of the present invention described above is configured such that a bottom dead center detecting sensor is attached to one of the upper die and the lower die and a target is attached to the other die, respectively, and the lower surface of the upper die and the lower die are attached. It is possible to detect the displacement (distance) of the upper surface of the mold by a non-contact sensor and also detect the thermal displacement of the upper mold and the lower mold by the sensor, and incorporate this into the control range of the bottom dead center control function. This can improve the accuracy of products punched by a press with a bottom dead center control function.

Further, by using the same material as the linear expansion coefficient of the punch for the sensor mount, the thermal displacement of the punch itself is offset, and the thermal displacement of the die and punch can be eliminated, and detection accuracy and product accuracy can be improved. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a first embodiment of the present invention, and FIG.
The drawing is a front view showing a second embodiment of the present invention. In these figures, 1 is a slide, 2 is a bolster, 3 is an upper mold,
Reference numeral 4 is a lower die, 5 is a stripper plate, 6 is a material to be processed, and 10 is a punch. Since these respective constituent parts are the same as in the case of FIG. 3 described as the prior art, detailed description thereof is omitted.

In the case of FIG. 1 which is the first embodiment of the present invention, the bottom dead center detection sensor 9 is attached to the lower die 4 via the sensor attachment base 7, and the target 8 is attached to the upper die 3. It is attached to the bottom surface. Thereby, the thermal displacement of the upper mold 3 and the lower mold 4 is also detected. In addition to the case of this embodiment, the sensor mount 7 and the target 8 may be a case in which a long target 8 is attached to the upper mold 3 side as shown in the fourth embodiment as another embodiment. The target 8 may be attached to the lower die and the sensor mount 7 may be attached to the upper die.

If the sensor mount 7 is made of the same material as the linear expansion coefficient of the punch 10, the thermal displacement of the punch 10 itself can be offset.

As a result of the punching test of the LED die for transistor (punching force 50 to 60 T) by the apparatus of the above-mentioned embodiment, the accuracy of the product (coining) was improved by about 20 μm.

[Effect of device]

As described above, according to the die thermal displacement compensation device of the present invention, by mounting the bottom dead center detection sensor in the upper and lower dies, (1) the thermal displacement of the upper and lower dies can also be detected, and the bottom dead center The precision of punched products can be improved with a press with control function.

(2) The sensor mount changes temperature due to heat conduction from the lower mold (Fig. 1) or upper mold (Fig. 4), but if the sensor mount is made of the same material as the linear expansion coefficient of the punch, The thermal displacement of the coining punch and the thermal displacement of the support base 7 cancel each other out, further improving the detection accuracy and the product accuracy.

[Brief description of drawings]

FIG. 1 is a front view of a die peripheral portion of a first embodiment device of the present invention, FIG. 2 is an overall configuration diagram of a conventional press with a bottom dead center automatic control function, and FIG. 3 is a metal mold of a conventional device. FIG. 4 is a front view of the die peripheral portion, and FIG. 4 is a front view of the die peripheral portion in the second embodiment of the present invention. 1 ... Slide, 2 ... Bolster, 3 ... Upper mold, 4 ... Lower mold, 5 ... Stripper plate, 6 ... Work material, 7 ... Sensor mount, 8 ... Target, 9 ... Bottom dead center detection sensor,
10 ... Punch, 11 ... Servo motor, 12 ... Main motor, 13
… Crankshaft, 14… Operation panel.

Claims (1)

(57) [Scope of utility model registration request] 1. A press with automatic bottom dead center control for detecting the dynamic bottom dead center position of a reciprocating slide by a sensor and adjusting the bottom dead center position within a certain precision width so as to face each other vertically. Non-contact bottom dead center detection that detects the displacement (distance) between the lower surface of the upper die and the upper surface of the lower die via the sensor mount of the same material as the punch in one of the upper die and the lower die A die displacement compensation device for a press, characterized in that a target sensor and a target are attached to the other die so as to face each other.