JPH02220799A - Apparatus for automatically selecting cushion pin - Google Patents

Abstract

PURPOSE:To improve working efficiency and to prevent human initiated miss by storing positional data of a cushion pin to be made to project according to a metallic mold and connecting with a control unit transmitting switching signal to a solenoid valve corresponding to the cushion pin. CONSTITUTION:In the case of executing press-working by using the desired metallic mold, the necessary position data of the cushion pin 7 are automatically selected with the controller 22 and a switching signal is transmitted to the solenoid valve 16 corresponding to the cushion pin 7. The solenoid valve 16 is switched over with the switching signal, and at the time of introducing (supplied) pressurize oil into a cylinder head side chamber in a hydraulic cylinder 17 supplied from a pump 20 through a check valve 21, the hydraulic cylinder 17 is expanded against energized force of a compressed spring. By this method, only the necessary cushion pin 7 is pushed up and kept to projecting condition from a bolster plate 4 by the necessary quantity. Therefore, setting work of the cushion pin 7 at the time of exchanging the metallic mold, does not need the human labor and can be quickly and surely executed, and human initiated miss can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic cushion pin selection device in a press machine.

[Prior Art] Conventionally, in a press machine, as shown in FIGS. 4 and 5, a guidance 2 is installed inside a bed 1, and a bolster plate 4 is mounted on the bed 1 via a carrier 3. is fixed so as to be located above the guidance 2, and a pin plate 6 is attached to a support member 5 such as a cylinder provided vertically downward with respect to the carrier 3 so as to be located between the guidance 2 and the bolster plate 4. The bolster plate 4 is provided with a pin hole 8 for inserting a cushion pin 7 for transmitting the pressure of the guidance 2 to a wrinkle presser (not shown) or the like.

Some of the above-mentioned guidance systems 2 utilize air pressure, oil pressure, spring pressure, rubber pressure, etc., but the one shown in FIG.
0, a cylinder body 12 having a guide rod 11 in the center is fitted so as to be slidable without maintaining airtightness, a pad 13 is integrally attached to the upper surface of the cylinder body 12, and a pad 13 is integrally attached to the upper surface of the cylinder body 12. The pad 13 is raised and lowered by supplying and discharging air into the air chamber 14 formed by the cylinder body 12 via an air pipe (not shown).

In the above-mentioned press machine, when replacing a mold (not shown), an operator inserts a plurality of cushion pins 7 into the pin holes 8 of the bolster plate 4 at required positions depending on the mold.
are inserted into the bolster plate 4 one by one. Fourth
When pressing the workpiece material (not shown) from the state shown in the figure, the pressure of the extraction 2, that is, the air chamber 14
While the pressure inside is transmitted to the wrinkle presser etc. through the plurality of cushion pins 7, the cylinder main body 12 descends by a stroke S from the upward stroke end position to the downward stroke end position, as shown in FIG. Pressing of the material to be processed is completed.

[Problems to be Solved by the Invention] However, as described above, if the worker inserts the cushion pin 7 into the required pin hole 8 every time the mold is replaced, the work efficiency is extremely low, and moreover, it is easy to make mistakes. There was also a possibility that the cushion pin 7 would be inserted in a stuck position.

In view of these circumstances, the present invention aims to provide an automatic cushion pin selection device that can improve work efficiency and prevent human errors.

[Means for Solving the Problems] The present invention includes inserting a cushion pin into a pin hole drilled in a bolster plate, and expanding and contracting a die cushion installed below the bolster plate by switching an electromagnetic valve. A flexible hydraulic cylinder is disposed in correspondence with each of the pin holes so that the rod end surface of the hydraulic cylinder can come into contact with the lower end surface of the cushion pin, and a flexible hydraulic cylinder is provided in accordance with the mold. The controller is connected to a control device that stores position data of the cushion pin to be changed and sends a switching signal to the electromagnetic valve corresponding to the cushion pin.

[Function] Therefore, when replacing a mold, the position data of the cushion pin according to the mold is automatically selected by the control device, and a switching signal is sent from the control device to the solenoid valve corresponding to the cushion pin. The solenoid valve is switched, the hydraulic cylinder is extended, and only the cushion pins necessary for the mold are pushed up, making it possible to press the workpiece material.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, the same reference numerals as in FIGS. 4 and 5 indicate the same parts.

As shown in FIGS. 1 and 2, a support frame 15 is integrally provided on the pad 13 of the guidance 2, and a solenoid valve 16 and a hydraulic cylinder 17 are mounted on the support frame 15 through the pin hole 8 of the bolster plate 4. The pin holes 9 are arranged vertically in correspondence with the pin holes 9 formed in the pin plate 6, and the upper support plate 15a of the support frame 15 is formed with holes 19 for passing through the rods 18 of the hydraulic cylinders 17. , the tip end surface of the rod 18 of the hydraulic cylinder 17 can come into contact with the lower end surface of the cushion pin 7, which will be described later, while the upper support plate The upper surface of the upper support plate 15a is made to be on the same level as the upper surface of the bed 1, and the rod 18 is prevented from protruding from the hole 19 onto the upper support plate 15a when each of the hydraulic cylinders 17 is shortened.

Further, a small diameter portion 7a is formed at the lower end of each of the cushion pins 7, and the diameter of the pin hole 9 is set such that the small diameter portion 7a can fit therein and the rod 18 can pass through. The cushion pins 7 are inserted into all the pin holes 8 of the bolster plate 4 in advance.

Furthermore, FIG. 3 is a hydraulic circuit diagram of each of the hydraulic cylinders 17. Each hydraulic cylinder 17 is equipped with a compression spring 24 that biases the rod 18 in the direction of retraction, and the check valve is connected to the pump 20. Pressure oil supplied through 21 is connected to solenoid valve 1.
6, the hydraulic cylinder 17 is guided to the cylinder head side chamber of the hydraulic cylinder 17, and the hydraulic cylinder 17 is expanded as necessary against the biasing force of the compression spring 24. Further, each of the solenoid valves 16 is connected to a control device 22 in which position data of the cushion pin 7 to be protruded according to the mold is stored in advance, and each of the solenoid valves 16 is controlled by a signal sent from the control device It is designed to switch the valve 16. In addition, in FIG. 3, 23 indicates a tank.

Next, the operation of this embodiment will be explained.

When performing press working using a desired mold, the position data of the cushion pin 7 required for the mold is automatically selected by the control device 22, and the position data of the cushion pin 7 corresponding to the cushion pin 7 is automatically selected from the control device 22. A switching signal is issued to the solenoid valve 16, which switches the solenoid valve 16, and when the pressure oil supplied from the pump 20 via the check valve 2I is guided to the cylinder head side chamber of the hydraulic cylinder 17, the hydraulic pressure is increased. The cylinder 17 expands against the biasing force of the compression spring 24. As a result, only the cushion pin 7 is pushed up as necessary, and a state in which it protrudes the required amount from the bolster plate 4 is maintained (FIG. 1).

In this state, when pressing is performed on the corrugated material (not shown), the pressure of the guidance 2 is transmitted to the wrinkle presser (not shown) etc. via the extending hydraulic cylinder 17 and the cushion pin 7. As shown in FIG. 2, the solenoid valve 16 and hydraulic cylinder 17, which are arranged on the support frame 15 together with the cylinder body 12 of the guidance 2, are as shown in FIG.
The cylinder body 12 gradually descends by a stroke S to the end position of the downward stroke, and the cushion pin 7 that had been protruding from the bolster plate 4 is also moved into the bolster plate 4 in the same manner as the cushion pin 7 corresponding to the hydraulic cylinder 17 that is not extended. When the corrugated material sinks completely, the pressing of the corrugated material is completed.

In this way, the cushion pins 7
Since the cushion pins 7 are inserted in advance and only the cushion pins 7 are made to protrude when necessary, the worker does not have to insert the cushion pins 7 into the required pin holes 8 each time the mold is replaced, which improves work efficiency. In addition, since the position data of the cushion pin 7 to be selected for each mold is stored in advance in the control device 22, human errors can be eliminated.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the present invention, the work of setting the cushion pins when replacing the mold can be done quickly and reliably without the need for manpower, and the work efficiency can be improved. This has the excellent effect of preventing human error.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG.
Figure 3 is a hydraulic circuit diagram of the hydraulic cylinder.
4 and 5 are side sectional views showing a conventional example. 1 is a bed, 2 is a guidance, 4 is a bolster plate, 6 is a pin plate, 7 is a cushion pin, 8.9 is a pin hole, 13 is a pad, 15 is a support frame, 16 is a solenoid valve, 17 is a hydraulic cylinder, 18 indicates a rod, and 22 indicates a control device.

Claims (1)

[Claims] 1) Insert a cushion pin into a pin hole drilled in the bolster plate, and attach a hydraulic cylinder that can be expanded and contracted by switching a solenoid valve onto the die cushion installed below the bolster plate, and insert the rod of the hydraulic cylinder into the die cushion. The cushion pin is arranged in correspondence with each of the pin holes so that the tip end surface can come into contact with the lower end surface of the cushion pin, and each of the electromagnetic valves stores position data of the cushion pin to be protruded according to the mold. A cushion pin automatic selection device is connected to a control device that sends a switching signal to a solenoid valve corresponding to the cushion pin.