JP2748103B2 - Bed knockout device for forging press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed knockout device for a forging press.

[0002]

2. Description of the Related Art Conventionally, a bed knockout device of a forging press employs a bed knockout pin having a circular cross section at the center of each stage, whether the forging press is for one stage or for multiple stages. Had been provided.

[0003]

In recent years, in the press working by a forging press, several steps are simultaneously processed, and the parts to be pressed often have different shapes. Often eccentric in the transport direction.

In order to cope with such an eccentric load at the time of press working, even if an attempt is made to shift the mold position in the component conveying direction in accordance with the working load distribution, the above-described bed knockout apparatus of the forging press described above has There is a problem that the mold position is shifted from the pin position and cannot be handled.

[0005] Further, the bond powder adhering to the parts is accumulated on the bed knockout pin or in the hole for sliding the bed knockout pin by press working, which sometimes hinders the smooth movement of the bed knockout pin up and down.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a bed knockout device capable of discharging a pressed part from the inside of a lower mold even when the mold position is deviated to cope with an eccentric load.

[0007]

In order to achieve the above-mentioned object, at least one of an oval or rectangular shape having a width equal to the outer diameter of an eject pin of a mold and a longitudinal direction in a component conveying direction is provided. With a bed knockout pin for the book,
A bed knockout device is formed by providing a bond powder discharge groove in a vertical direction at a required portion on the outer periphery of the bed knockout pin.

In order to cope with a conventional bed knockout pin having a circular cross-sectional shape, the outer diameter of this pin must be the length of an oval in the longitudinal direction. According to the method of the present invention, a bed knockout pin having a minimum necessary cross-sectional area is sufficient.

[0009]

With the above construction, even when the mold position is deviated in the component conveying direction in accordance with the eccentric load, the eject pin of the mold is received on the upper surface of the oval or rectangular bed knockout pin. Can be done. Also, since the bed knockout pin was guided by the upper and lower guides of the bed,
Even if the mold is displaced and an eccentric load acts on the bed knockout pin, the vertical movement is smooth.

Further, since the bond powder discharging groove is provided in a vertical direction of a required portion on the outer periphery of the bed knock out pin, it is possible to prevent the vertical movement of the bed knock out pin from becoming uneven due to the bond powder. Further, it is possible to minimize the decrease in the pressure receiving area of the lower mold provided with the escape of the bed knockout pin.

[0011]

1 and 2 show an embodiment of a bed knockout device according to the present invention. FIG. 1 shows a bed knockout device having three stages in the left-right direction at an interval P between stages, that is, in the component transfer direction.

The bed knockout pin 3 is slidably fitted in a hole 4 vertically penetrating the bed 1 and a bolster 2 attached to the upper surface thereof.

As shown in FIG. 1 (a), the hole 4 has a left and right length A and a width B, and is formed in an oval shape in which both right and left ends are circular. Bed knockout pin 3 is hole 4
And the width B is equal to or slightly larger than the outer diameter D of the eject pin 10 of the mold.

The bed knockout pin 3 is shown in FIG.
As is clear from the above, notches 5 and 5 are provided at both end surfaces in the left and right direction, and grooves 6 and 6 are provided at a required depth at the center of the side surface in the width direction over the entire length in the vertical direction. It is a powder discharge groove. The shape of the hole 4 may be a rectangle.

[0015] As shown in FIG.
Pin guides 8 and 8 are provided at both upper and lower ends, and a relief 9 is provided in the middle. The lower end of the bed knockout pin 3 is
A knockout roller 13 is circumscribed around a support shaft 12 fixed to the knockout lever 11 so as to be rotatable.

As shown in FIG. 1 (c), the pin guide 8 has an annular oval cross-sectional shape that allows the outer shape of the bed knockout pin 3 to slide. By guiding the bed knockout pin 3 by providing the pin guides 8, 8 vertically, the reference pin 10 is deviated left and right from the center position shown in FIG. 1A, and an eccentric load is applied to the bed knockout pin 3. In the event that the

FIG. 2 shows a forging press 14 equipped with the bed knockout device of the present invention. A rotating cam 16 is attached to a rotating shaft 15 protruding from the left side surface of the forging press 14.
A cam follower 18 of a lever 17 having one end rotatably supported on a side surface of the forging press 14 is brought into contact with the rotating cam 16 from above, and a forging is formed at the lower end of a vertical rod 19 connected to the other end of the lever 17. One end of a bell crank 20 rotatably supported on the side surface of the press 14 is connected.

At the lower part of the bed 1, a lever 22 fixed to the end of a horizontal shaft 21 rotatably provided in the left-right direction and extending upward, and the other end of the bell crank 20 are connected to a horizontal rod 23.
And an air cylinder 24 is provided between the rear end of the horizontal rod 23 and the side surface of the forging press 14. The base of the above-mentioned knockout lever 11 is fixed to an intermediate portion of the horizontal shaft 21.

When the forging press 14 is operated, the rotating shaft 15
Rotates, and the rotating cam 16 rotates the cam follower 1 at a required time.
The lever 17 is turned via the lever 8 to pull up the vertical rod 19. When the bell crank 20 is rotated and the horizontal rod 23 is retracted against the urging force of the air cylinder 24, the horizontal shaft 21 is rotated via the lever 22 so that the tip of the knockout lever 11 moves upward. To rotate.

Therefore, as shown in FIG. 1, the knock-out roller 13 pushes up the bed knock-out pin 3 and the eject pin 10 of the mold, which is the lower knock-out pin.
Protrudes parts from the lower mold. When the rotating cam 16 has passed the position of the cam follower 18, it is restored by the urging force of the air cylinder 24.

Since the bed knockout pin 3 has an elliptical shape in the component conveying direction, even if the mold position is shifted in the component conveying direction in accordance with the eccentric load in accordance with the load distribution, the eject pin of the mold is disengaged. 10 lower end can be received.

Although the processing load applied to the bed knockout pin 3 is eccentric, since the pin guide 8 of the bed 1 is divided into upper and lower portions, it can be guided smoothly correspondingly. Also, even if the bond powder falls on the bed knockout pin 3 during the press working, the bond powder discharge groove is provided, so that the bond powder is discharged to the lower part of the bed 1 and does not hinder the vertical movement of the bed knockout pin 3. .

[0023]

As is apparent from the above description, according to the present invention, even if an eccentric load is generated by press working, the mold position can be arbitrarily shifted according to the load distribution.
Using a two-point press, it can also handle press work due to eccentric load that could not be handled by a one-point press,
Equipment costs can be reduced. Further, if the present invention is applied to a two-point press, the ability to cope with an eccentric load increases, and the working range can be expanded.

[Brief description of the drawings]

FIG. 1A is a plan view of a bolster according to an embodiment of the present invention. FIG. 1B is a sectional view of a main part of the bolster. FIG.
II sectional view of

FIG. 2 is a left side view of a main part of a forging press for explaining a bed knockout device.

[Explanation of symbols]

1 is a bed, 2 is a bolster, 3 is a bed knockout pin, 4 is a hole, 5 is a notch, 6 is a groove, 8 is a pin guide, 9 is an escape, 10 is a mold eject pin, 11 is a knockout lever, and 12 is a knockout lever. Support shaft, 13 is a knockout roller, 1
4 is a forging press, 15 is a rotating shaft, 16 is a rotating cam, 17
Is a lever, 18 is a cam follower, 19 is a vertical rod, 20
Is a bell crank, 21 is a horizontal axis, 22 is a lever, 23 is a horizontal rod, 24 is an air cylinder, A is the left and right length of the hole 4,
B is the width of the hole 4, D is the outer diameter of the eject pin of the mold, and P is the distance between the stages.

Claims (1)

(57) [Claims] 1. A bed knockout device comprising: a rotary cam provided on a rotary shaft of a forging press as a driving source; and a horizontal axis at a lower portion of the bed is rotated, and a bed knockout pin is pushed up by a lever fixed to the horizontal axis. The cross-sectional shape of the bed knockout pin of the book is formed in an oval or rectangular shape in which the component conveying direction is the longitudinal direction, and a bed portion for guiding the bed knockout pin up and down has an upper part of the bed knockout pin. And a lower portion for guiding the bed and the lower portion, respectively, and the bed knockout pin has a notch or groove in the left and right end portions of the cross-sectional shape and a central portion of the lateral side in the width direction. Is provided over the entire length in the vertical direction.