JP3129362B2 - Knockout pin holding mechanism for moving bolster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knockout pin holding mechanism for locking and unlocking a knockout pin for a moving bolster mounted on a press machine.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a press equipped with a moving bolster. In FIG. 1, reference numeral 1 denotes a moving bolster mounted on a bed 2, and a lower mold 4 on the moving bolster 1 via a lower mold plate 3.
Is installed. An upper press ram 5 is provided above the bed 2 so as to be able to move up and down. An upper die 7 is attached to the press upper ram 5 via an upper die plate 6. When the press upper ram 5 descends, the upper mold 7 is fitted to the lower mold 4, and a molded product P is formed between the two. A knockout pin 8 is slidably inserted into the moving bolster 1, the lower mold plate 3, and the lower mold 4, and the knockout pin 8 is driven up and down by driving means (a crank mechanism or the like) disposed below the bed 2. , So as to discharge the molded product P from the lower mold 4 at a predetermined timing. Reference numeral 9 denotes a guide rod for positioning and guiding the upper die bolster 6 with respect to the lower die plate 3.

In the above press machine, the mold is changed using two moving bolsters 1. That is, when replacing the mold, first, the upper mold plate 6 and the upper mold 7 are cut off from the press upper ram 5, and these are fitted to the lower mold plate 3 and the lower mold 4, respectively, and are collectively supported by the moving bolster 1. Then, the rail 10 embedded in the bed 2 is raised by a cylinder (not shown) , and the moving bolster 1 is slightly lifted from the bed 2, and is moved using wheels (not shown) provided on the moving bolster 1. The bolster 1 and the mold thereon are moved to one side of the press as indicated by arrow A. On the other hand, on the other side of the press machine, the next die is set for another moving bolster (not shown), and at the same time when the moving bolster 1 moves in the direction of the arrow A, another moving bolster is moved to the arrow B. Is moved into the press machine as shown by.

In this case, if the knockout pins 8 are continuous in the vertical direction, the movement of the moving bolster 1 is hindered. Therefore, conventionally, the knockout pins 8 are moved to the bed 2, the moving bolster 1, the lower plate 3, and the lower plate 3. Type 4
And the moving bolster 1
A knockout pin holding mechanism described later is provided therein, and the holding mechanism restricts the knockout pin above the moving bolster 1 from dropping.

FIG. 3 shows such a knockout pin holding mechanism 11. In the figure, reference numeral 8a denotes a divided knockout pin divided corresponding to the moving bolster 1, and the divided knockout pin 8a is guided by a bush 12 fitted in the through hole 1a of the moving bolster 1. . Knockout pin holding mechanism 11
A ring member 13 fitted in a concave portion 1b provided on the lower surface of the moving bolster 1 in contact with the bed 2, a plurality of wedge members 14 provided so as to wedge the tapered inner surface 13a of the ring member 13, and a bush. A spring 15 is fixed to one end of the wedge 12 and normally urges the wedge member 14 downward.

In the knockout pin holding mechanism 11, when the moving bolster 1 is lifted from the bed 2, the wedge member 14 projects from the lower surface of the moving bolster 1 by a predetermined distance δ due to the spring force of the spring 15. The wedge member 14 is moved radially inward along the tapered inner surface 13a of the member 13, and the divided knockout pin 8a is restrained (locked). On the other hand, when the moving bolster 1 is placed on the bed 2 from this state, the wedge member 14
The split knockout pin 8a is released from the restraint of the wedge member 14 by being retracted by the distance δ against the urging force of 15 (unlocked).

[0007]

In hot or warm forging, a large amount of lubricant (also used as a coolant) is applied to a mold during forging, and a large amount of scale is generated. In hot forging, a lubricating film applied to a forged material during forging is generated as scum. However, according to the above-described conventional knockout pin holding mechanism 11, since the area around the knockout pin 8 (8a) is the working area, the lubricant, scale, or scum of the lubricating film passes through the sliding portion of the knockout pin 8. When the moving bolster 1 enters the housing of the spring 15 and accumulates in the housing during repeated forging, the operation of the spring 15 is hindered, and the locking of the knockout pin 8 does not work, and the moving bolster 1 cannot move. Occurred often.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a moving bolster capable of stably locking and unlocking a knockout pin for a long period of time. It is to provide a knockout pin holding mechanism.

[0009]

The present invention provides a means for achieving the above object by providing an engaging recess on a peripheral surface of a knockout pin slidably inserted into a moving bolster, A basic configuration is provided in which a lock pin that is moved by a driving means in a direction intersecting the sliding direction of the knockout pin and is engaged with and disengaged from the engagement recess is provided.
You .

The present invention relates to the above basic configuration.
The drive means always knocks out the lock pin.
A first biasing member for biasing the pin in a direction to be disengaged from the engagement concave portion;
A biasing means and a second extending in a sliding direction of the knockout pin.
From the lower surface of the moving bolster
An operating pin that is biased in a direction in which the operating pin projects, and
Move forward in the direction of protrusion from the moving bolster
The lock pin is moved in the direction of engagement with the engagement recess.
And a cam mechanism .

[0011]

According to the knockout pin holding mechanism of the moving bolster configured as described above, the lock pin is moved in a direction intersecting the sliding direction of the knockout pin,
Since the knockout pin is locked and unlocked, no lubricant, scale or lubricating film residue enters the sliding portion of the lock pin, and the sliding of the lock pin is stabilized for a long time, and the knockout Pins can be securely locked and unlocked. In addition, the lock pin driving means is
Lock the lock pin in conjunction with the movement of the bing bolster.
Lock and unlock operation, so special
No power source is required.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a knockout pin holding mechanism of a moving bolster according to the present invention. Since the overall structure of the press machine to which the knockout pin holding mechanism is applied is the same as that shown in FIG. 2 described above, the description is omitted here, and the structure shown in FIGS. The same parts are given the same reference numerals. In this embodiment, the bush 12 for guiding the divided knockout pin 8a is provided so as to cover the entire length of the through hole 1a of the moving bolster 1. Further, in this embodiment, an annular engaging recess (circumferential groove) 20 is provided on the peripheral surface of the divided knockout pin 8a, while the moving bolster 1 has a direction intersecting the sliding direction of the divided knockout pin 8a ( In this case, a lock pin 21 which moves in a horizontal direction) and engages with and disengages from the circumferential groove 20 is provided.

The lock pin 21 has a small diameter portion at its front and rear ends.
The front small diameter portion 21a is seen through the window 12a opened in the bush 12 to the peripheral surface of the divided knockout pin 8a, while the rear small diameter portion 21b projects rearward from the rear wall of the moving bolster 1. Let me. An assembling block 22 is integrated with the rear wall of the moving bolster 1 with its lower surface aligned with the lower surface of the moving bolster 1.

A chamber 24 having a rectangular cross section and a relatively deep depth is formed in the upper part of the assembly block 22. In this chamber 24, two cam members 25 and 26 have mutually inclined surfaces 25a and 26a. It is stored in sliding contact. Of these two cam members, one cam member 25 is disposed so as to be slidable in the horizontal direction along the bottom surface of the chamber 24, and the rear end small diameter portion 21b of the lock pin 21 is threadably connected thereto. ing. This one cam member 25 is normally urged rightward by a first spring 27 whose one end is in contact with the front (left) side surface 24a of the chamber 24. Therefore, the lock pin 21 is always in a divided knockout pin. 8a
Is urged in a direction to separate from the circumferential groove 20. The other cam member 26 is disposed so as to be vertically slidable along the rear (right) side wall 24b of the chamber 24, and includes an actuation extending in the assembly block 22 in the same direction as the divided knockout pin 8a. One end of the pin 28 is screwed and connected.

The operating pin 28 is slidably inserted into a vertical hole 29 provided in the assembly block 22. The vertical hole 29 has a large-diameter portion 29a in the middle thereof, and a flange 28a provided in the middle of the operating pin 28 is pressed into the large-diameter portion 29a to lower the lower end of the operating pin into an assembly block. A second spring 30 that projects a small distance δ from the lower surface of 22 is housed. The spring force of the second spring 30 is set to be greater than the spring force of the first spring 27, so that when the moving bolster 1 is lifted from the bed 2, the operating pin 28 Projecting from the lower surface of the cam member by a distance δ, the cam member 26 integral therewith is positioned at the lower end shown by the solid line in the figure, and the other cam member is accordingly
25 moves to the left.

The operation of the knockout pin holding mechanism configured as described above will be described below.

When the moving bolster 1 is lifted from the bed 2 at the time of exchanging the mold, the operating pin 28 projects from the lower surface of the assembly block 22, that is, the lower surface of the moving bolster 1 by a predetermined distance δ by the spring force of the second spring 30, The cam member 26 integrated therewith is similarly lowered by the distance δ. At the same time, the other cam member 25 moves leftward against the spring force of the first spring 27, and the small diameter portion 21a at the tip of the lock pin 21 enters the circumferential groove 20 of the divided knockout pin 8a, and The knockout pin 8a is locked with its tip slightly protruding from the moving bolster 1 so that the moving bolster 1 can be moved out of the press machine.

On the other hand, the moving bolster 1 after the setting of the mold is moved into the press machine, and is landed on the bed 2. Then, the operating pin 28 is retracted by the distance δ against the spring force of the second spring 30, and the cam member 26 integral therewith moves upward to the position indicated by the broken line in the figure. This allows the other cam member
25 moves rightward due to the spring force of the first spring 27, and accordingly the lock pin 21 also moves rightward, and the small-diameter portion 21a at the tip of the lock pin 21 comes out of the circumferential groove 20 of the divided knockout pin 8a. The split knockout pin 8a is unlocked.

However, the direction of movement of the lock pin 21 intersects with the direction in which the knockout pin 8 slides.
During the forging, even if lubricants, scales or scum of the lubricating film enter the sliding portion of the knockout pin 8, they do not penetrate to the sliding portion of the lock pin 21. Is stable for a long time.
Further, in the present embodiment, the lock pin 21 is driven by the operating pin 28 which is linked to the movement of the moving bolster with respect to the bed, as in the conventional case, so that a special power source is not required and the cost burden is increased. It can be minimized.

In the above embodiment, the assembly block 22 is integrated with the rear wall of the moving bolster 1 and the cam members 25 and 26, the operating pins 28, and the like are arranged in the assembly block 22. It goes without saying that the block 22 may be omitted and the cam members 25 and 26, the operating pins 28 and the like may be directly arranged on the moving bolster 1. Further, in the above embodiment, the engaging recess 20 provided in the divided knockout pin 8a has a peripheral groove shape, but the shape of the engaging recess is arbitrary, and can be a simple concave shape .

[0022]

As described above in detail, according to the knockout pin holding mechanism of the moving bolster according to the present invention, the locking pin that moves in the direction intersecting the sliding direction of the knockout pin is used. The knockout pin is locked and unlocked, so the knockout pin can be securely locked and unlocked without being affected by lubricants, scales, or scum of the lubricating film, greatly improving the reliability of the device. I do. In addition, the means for driving the lock pin uses a knockout pin only by the movement of the moving bolster relative to the bed as in the conventional case.
Locks and unlocks, so special
A power source is not required, and an increase in cost burden can be minimized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a knockout pin holding mechanism of a moving bolster according to the present invention.

FIG. 2 is a schematic diagram showing a general structure of a press machine provided with a moving bolster.

FIG. 3 is a cross-sectional view showing a structure of a conventional knockout pin holding mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving bolster 2 Bed 8 Knockout pin 8a Split knockout pin 20 Engagement concave part (circumferential groove) 21 Lock pin 22 Block 25 Cam member 26 Cam member 27 Spring (first biasing means) 28 Operating pin 30 Spring (Second Biasing means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP 3-24341 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21D 45 / 04,37 / 04 B30B 15 / 02,15 / 32

Claims (1)

(57) [Claims] 1. An engaging recess is provided on a peripheral surface of a knockout pin slidably inserted into a moving bolster, and the moving bolster is moved by a driving means in a direction intersecting the sliding direction of the knockout pin. Knock of moving bolster equipped with lock pin that engages with and disengages from engagement recess
In the out-pin holding mechanism, the driving means may be a lock.
Always remove the pin from the engagement recess of the knockout pin
First biasing means for biasing in a direction
Moving in the sliding direction of
The bolster is urged to protrude from the lower surface.
An operating pin and a protrusion of the operating pin from the moving bolster.
The lock pin is moved to the engagement recess in response to the movement in the extension direction.
And a cam mechanism that moves in the engagement direction.
Moving bolster knockout pin holding machine
Structure.