JPH0747440A - Knockout device of forging press - Google Patents

Abstract

PURPOSE:To prevent trouble caused by a mismatch by making the knockout device of a forging press variable. CONSTITUTION:In the forging press for excuting the adjustment (movement of a bottom dead center, etc.) of a forging load by sliding which runs along the inclined surface of a fixed body 1 and a sliding body 2, a knockout pin 4 consisting of a projecting pin 41, anadjustment wedge 44 and an operating pin 42 is engaged and fitted integrally into a holder 3 for passing through both of them. Both ends of the adjustment wedge jump out of a horizontal through- hole 32 of the holder 3 until the holder 3 almost approahes a slot 22 of the sliding body 2 which is fitted loosely, and its lower face consists of the inclined surface 43 of the same angle as the inclined surface. When the sliding body 2 slides in order to adjust a load fluctuation, the knockout pin 4 remains as it is and only the adjustment wedge 44 is constrained by the slot 22 slides together, and simultaneously, by moving a projecting pin engaged in the lower part, a pin stroke is adjusted synchronously. That is, the knockout adjustment tuned to the adjustment of a press work is excuted automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging press, and more particularly to a knockout device for a press of a type in which the height of an upper die or a lower die is slid on an inclined surface of a fixed body and a sliding body.

[0002]

2. Description of the Related Art The most common structure of a forging press is to attach an upper die directly to the bottom of a ram or via a die holder and place the lower die holder directly on a bed facing the upper die. The lower mold is attached via the above, and the material sandwiched between the two molds is pressed and molded by the operation of the ram that converts the rotation of the main shaft into a lifting motion. in this case,
No matter what type of forging press, it is not always the case that products of the same shape are molded, and it is common practice to manufacture several types of products even during a day's operation.
In order to mold products of different shapes like this, there are optimum pressing loads for each shape and size,
Even if all products are molded under the same pressure, it is not always possible to obtain accurate products. That is, it is necessary to adjust the load of the forging press so as to match the shape and size of the product.

The most common method of adjusting the load of a forging press is to adjust the position of the bottom dead center of the ram. There are various methods for adjusting the bottom dead center, but the object of the present invention is the method of adjusting the height in the vertical direction by sliding two members that are in contact with each other on the inclined surface. FIG. 6 shows a conventional Scotch yoke type forging press, in which a sliding body 2a is slidably fitted into a sliding chamber 15a provided inside a ram 1a which is a fixed body, and is slidable into the sliding body. It is characterized in that a yoke 6a is fitted therein, a main shaft 5a having an eccentric shaft 51a is passed through the inside of the scotch yoke, and the ram moves up and down by converting into a traverse motion of the scotch yoke which is rotated by the main shaft. In this case, the ram itself is a fixed body, and the slidable surface 2a is in contact with the fixed body at the inclined surfaces. A hydraulic cylinder 16a is attached to a side surface of the sliding body for driving the sliding body 2a to slide along the inclined surface, and pushes and moves by a necessary amount as necessary. By this sliding, the distance from the center of the spindle to the bottom surface 17a of the ram is adjusted, and the position of the bottom dead center is changed. Not only this scotch-yoke type forging press, but many types of forging load adjustment are performed by using sliding on the inclined surfaces of two inclined members.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The knockout device that knocks out the molded product is attached to the lower bottom of the ram, the upper and lower bolster surfaces, or the direct mold surface so that the tip can be moved up and down, and the pin at the tip is projected at the timing after molding. The product is knocked out. In the example of this figure, the roller 45 attached to the tip of the knockout pin 4a is accompanied by the traverse of the cam plate 61a fixed to the bottom of the Scotch yoke.
a moves up and down, whereby the lower end of the knockout pin projects downward, and the timing of this projection matches the movement of the Scotch yoke, that is, the raising and lowering of the ram, so that molding and knockout are continuously performed. Synchronize.

However, changing the bottom dead center for adjusting the forging load as described above is nothing but changing the distance from the main shaft to the bottom surface of the ram. If one knockout pin is left unchanged, The protrusion stroke of the pin tip is different from the adjusted bottom dead center as compared with that before the adjustment, and there is a concern that timing failure may occur unless the mold design allowance is given. Even if the timing is not defective, if the knockout timing changes in the case of automatic continuous pressing, the position where the product protrudes will fluctuate, so there is a concern that the position where the transfer bar grips the molded product may be misaligned and it may cause conveyance failure. There is also.

[0006] Such adjustment of the bottom dead center is often carried out, and strictly speaking, it can be said that it is correct to carry out whenever the shape and size of the product change, but on the other hand, the bottom dead center is adjusted each time the adjustment is made. Replacing the knockout pin, which has been changed in length to match the movement of, is truly uncomfortable. Moreover, as the operation of the forging press is accelerated in order to improve the efficiency as in recent years, the timing deviation between the forging press forming and the knockout disengagement becomes an issue that cannot be overlooked.

In order to solve the problems described above, the present invention automatically synchronizes the knockout stroke when sliding is performed between the adjusting member inclined surfaces of the forging press for adjusting the bottom dead center. It is an object of the present invention to provide a knockout device that is adjusted to a certain timing and always holds a specific timing by matching the movements of both.

[0008]

In the knockout device according to the present invention, the height of the upper die surface or the lower die surface is adjusted by sliding the fixed body 1 and the sliding body 2 having the inclined surfaces at the same angle. For a forging press, the holder 3 is fixed to the through hole 12 of the fixed body, loosely fits into the long hole 22 of the sliding body, and penetrates both of them. The holder 3 is inserted into the vertical through hole 31 of the holder 3 toward the mold side. A protruding pin 41, an operating pin 42 that is fitted into the drive side,
And a knock-out pin 4 which is vertically moved integrally by an adjusting wedge 44 which engages both pins with each other in the vertical direction and has an inclined surface 43 having the same angle as the inclined surface, and which laterally penetrates the lateral through hole 32 of the holder 3. The above problem is solved by the fact that the entire length of the adjusting wedge 44 is substantially equal to the hole length of the elongated hole 22 penetrating the sliding body 2.

In this case, specifically, the forging press is a Scotch yoke press, and the Scotch yoke traverses in the sliding body 2 slantingly slid in the sliding chamber 15 formed in the fixed body ram. A roller 45, which comes into pressure contact with the bottom surface of the cam plate 61 attached to the lower bottom portion of 6, is provided at the tip of the operating pin 42
The protrusion pin 41 has a tip aligned with the bottom surface of the ram, or a knockout bar 71 for biasing the forging press to the side opposite to the die, and a knockout 7 for lowering the knockout bar 71 against the biasing force. The roller 45 at the tip of the operating pin 42 is urged so as to come into pressure contact with the knockout bar 71, and the tip of the protruding pin 41 is aligned with the bottom surface 73 of the adapter 72, or the die height adjusting device 8 of the forging press is This is due to the sliding between the two inclined surfaces housed in the bolster 82. The roller 45 at the tip of the actuating pin 42 comes into pressure contact with the surface of the knockout lever 83 in the bed 81, and the tip of the projecting pin 41 becomes bolstered. It can be applied to various forging presses such as matching the upper surface 83 of 82, and the Scotch yoke type press is only one example, Wamete it is also true it is a suitable embodiment.

[0010]

1 (A), (B) and (C) are partial front elevational views showing the operation of the present invention. In the figure, (A) and (B) show the action of the knockout device during the operation of a normal forging press under a certain condition. The inclined surface 11 of the fixed body 1 (for example, the ram body of the Scotch yoke press) and the sliding body are shown. The two slanted surfaces 21 come into contact with each other, and the sliding body 2 can slidably slide along the slanted surfaces. In the state of this figure, the through hole 12 that vertically penetrates the fixed body and the long hole 22 that penetrates the sliding body 2 communicate with each other with their inner surfaces aligned. A holder 3 that commonly penetrates both bodies is fixed to a through hole 12 of a fixed body, and a knockout pin 4 is fitted into a vertical through hole 31 of this holder. Knockout pin has adjustable wedge 4
4, the operating pin 42 and the projecting pin 41 are engaged with each other to move up and down integrally. That is, in FIG. 5A, the roller 45 at the tip of the actuating pin contacts a driving member, for example, a cam plate 61 of a Scotch yoke, and press-contacts with the urging force, and the distance from the bottom surface of the driving member 61 to the ram bottom surface 17 is H1. Upper surface 2
The distance from 3 to the bottom surface 17 of the ram is indicated by H2, and the levels of the tip of the protruding pin and the bottom surface 17 of the ram are set to coincide with each other. At the time of the figure (B), the scotch yoke moves and the height of the cam plate decreases by a distance N, and the cam plate pushes down the roller against the urging force, and this movement projects over the entire knockout pin in the holder. Since the tip of the pin 41 projects from the ram bottom surface by the distance N, a knockout action of the product is exhibited. The distance H2 in this case remains unchanged, and the distance H5 is shortened by the distance N from the distance H1. By repeating these two modes, the knockout action of the forging press progresses under one forging condition.

FIG. 3C shows the variation of the positional relationship of each member when the bottom dead center is adjusted because the shape and size of the target product have changed. In this adjustment, the sliding body 2 slides by a distance G (in the example shown in the figure, slides to the right to move the bottom surface 17 of the ram a distance h).
The bottom dead center is lowered by a distance h, and the distance between the drive member and the ram bottom surface is changed from H1 to H4. H4 = H1 + h When the sliding body 2 is slid, the long hole 22 that moves
Since the holder in the box remains stationary, the relative positional relationship between the two changes. That is, of the knockout pins, only the adjusting wedge 44 has its both ends sandwiched in the vicinity of both ends of the inner surface of the elongated hole. Therefore, if the elongated hole moves, both ends of the adjusting wedge are forced and move together. The movement of the adjusting wedge 44 is accompanied by the movement of the sliding body while the inclined surface 43 having the same inclination angle as the inclined surface of the sliding body slides across the holder, and the position of the holder itself does not change. However, the protruding pin 41 in the holder is pushed by the movement of the wedge and pushed down along the inclined surface, and the length to the tip thereof is extended by the distance h. In other words, the knockout pin length also extends by the same distance as the distance fluctuation h from the drive section to the bottom of the ram, and the bottom dead center adjustment distance and the knockout pin stroke adjustment distance match, so the condition for knockout action is always constant. The timing is kept constant and there is no discrepancy in timing.

[0012]

FIG. 2 is a vertical sectional front view of an embodiment of the present invention, showing an example in which the press type is a Scotch yoke type. The ram itself is the fixed body 1, and the sliding chamber 15 bored in the ram
Slide body 2 having an inclined surface 21 at the same angle as the inclined surface 11 of
Is slidably fitted on an inclined surface and is slidably adjusted by a hydraulic cylinder 16 provided diagonally below the ram. A scotch yoke 6 is fitted into the sliding body 2, and an eccentric shaft 51 that traverses the scotch yoke serves as a driving body that causes the scotch yoke 6 to traverse by the rotation of the main shaft 5. A cam plate 61 is provided on the bottom of the Scotch yoke 6.
Is fixed and traverses along with the Scotch yoke, and the cam plate and the roller 45 axially supported by the tip of the knockout pin 4 are pressed against each other by a spring 46 biasing upward in the holder 3. Depending on the position of the cam plate, the roller is pushed down against this urging force so that the tip of the protruding pin moves to the ram bottom 17
Stick out from.

FIG. 3 is a perspective view collectively showing the disassembled knockout pin 4, the holder 3, and the fixed body 1 and the sliding body 2 into which the both are fitted in this embodiment. The knock-out pin 4 has a driving member at its tip, for example, a cam plate 61.
Slidably by an operating pin 42 that axially supports a roller 45 that comes into pressure contact with, an adjusting wedge 44 that engages with a long groove 47 formed in the lower end surface of the operating pin 42, and an inclined surface 43 that constitutes the lower surface of the adjusting wedge 44. A projecting pin 41 having an engaging inclined groove 48 formed on the upper end surface is integrally connected in the holder so as to be vertically movable. The knockout pin is fitted into the vertical through hole 31 penetrating the axial center of the holder 3, but the adjusting wedge 44 protruding in the lateral direction penetrates the lateral through hole 32 opening in the holder and projects out of the holder to be integrated. Housed in. Since the adjusting wedge 44 is slidably engaged between the actuating pin and the projecting pin, if the adjusting wedge slides, it is pushed by the inclined surface and the projecting pin below is forced to move in the vertical direction. Is pushed down to move the position of its tip.

The through hole 12 of the fixed body 1 is preferably provided with a step at the lower opening for fitting and fixing the holder 3. However, the escape holes 13 are provided at both ends of the through hole 12 of the knockout pin including the adjusting wedge. I am planning a flight when inserting. on the other hand,
The sliding body 2 needs the elongated hole 22 for fitting the adjusting wedge 44 which is fitted together with the knockout pin, and the overall length in the longitudinal direction thereof is set to be slightly larger than the entire length of the adjusting wedge so that the sliding body slides. The sliding of the adjustment wedge is designed to proceed at the same time. As the order of assembling, the knockout pin and the holder integrally assembled from the through hole on the bottom surface of the fixed body (ram) are inserted upward. At this time, both ends of the adjusting wedge projecting are escaped and fitted into the escape holes 13 of the fixed body. The knockout pin and the holder, the upper half of which is exposed, are fitted into the elongated hole 22 of the sliding body 2 to complete the mounting.

FIG. 4 is a vertical sectional front view showing another embodiment of the present invention, which is not a Scotch yoke type but a knockout bar 71 in which the forging press is biased to the side opposite to the die,
The knockout bar 71 is provided with a knockout 7 for lowering it against an urging force, and the roller 45 at the tip of the operating pin 42 is urged so as to come into pressure contact with the knockout bar 71.

FIG. 5 is a vertical sectional front view showing still another embodiment of the present invention, which is an example in which a knockout pin is attached to a lower mold. In this case, the forging load is adjusted not by raising and lowering the bottom dead center but by changing the level of the lower die. That is, the die height adjusting device 8 of the forging press is moved up and down by sliding between the two inclined surfaces housed in the bolster, and the roller 45 at the tip of the operating pin 42 is moved to the surface of the knockout lever 83 in the bed 8. Pressed, and the tip of the protruding pin 41 has an upper surface 84 of the bolster 82.
Is the same as the previous example.

[0017]

The knockout device for a forging press according to the present invention is provided with a fixed body and a sliding body for raising and lowering the bottom dead center and adjusting the die height level in order to increase or decrease the forging load in response to changes in the shape and size of the product. When sliding on the inclined surface of
Since the position of the tip of the knockout pin is moved by sliding by the same amount in synchronization with the sliding, the relative relationship between the two does not change, and the timing required for press operation and knockout operation is always maintained. . As a result, there is no timing mismatch, and there is no concern that the transfer operation may be misaligned. Alternatively, it is not necessary to prepare in advance a plurality of knockout pins having different lengths in order to cope with the fluctuation of the bottom dead center, and it is possible to avoid the troublesome work of replacing the pins. After all, the effect that it greatly contributes to the improvement of forging workability and the assurance of the reliability of the quality of the product can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing each aspect in an embodiment of the present invention by (A), (B) and (C).

FIG. 2 is a vertical sectional front view of an example applied to a Scotch yoke type forging press.

FIG. 3 is a perspective view showing the same embodiment with the constituent members disassembled.

FIG. 4 is a vertical sectional front view of an example applied to another type of forging press.

FIG. 5 is a vertical sectional front view of an example applied to another type of forging press.

FIG. 6 is a vertical sectional front view showing a conventional technique in a Scotch yoke type forging press.

[Explanation of symbols] 1 Fixed body 2 Sliding body 3 Holder 4 Knockout pin 5 Spindle 6 Scotch yoke 7 Knockout 8 Die height adjustment device 11 Inclined surface 12 Through hole 13 Escape hole 15 Sliding chamber 16 Hydraulic cylinder 17 Bottom surface 21 Inclined surface 22 Length Hole 23 Top surface 31 Vertical through hole 32 Horizontal through hole 41 Projecting pin 42 Actuating pin 43 Sloping surface 44 Adjusting wedge 45 Roller 51 Eccentric shaft 61 Cam plate 71 Knockout 72 Adapter 73 Bottom 81 Bed 82 Bolster 83 Knockout lever 84 Top surface

Claims (4)

[Claims] 1. A forging press in which the height of an upper die surface or a lower die surface is adjusted by sliding a fixed body 1 and a sliding body 2 each having an inclined surface of the same angle, and fixed in a through hole 12 of the fixed body. Then, the holder 3 is provided which is loosely fitted in the elongated hole 22 of the sliding body and penetrates both of them, the projecting pin 41 which is fitted to the mold side of the vertical through hole 31 of the holder 3, the operating pin 42 which is fitted to the driving side,
And a knock-out pin 4 which is vertically moved integrally by an adjusting wedge 44 which engages both pins with each other in the vertical direction and has an inclined surface 43 having the same angle as the inclined surface, and which laterally penetrates the lateral through hole 32 of the holder 3. A knockout device for a forging press, wherein the entire length of the adjusting wedge 44 is substantially equal to the hole length of the long hole 22 penetrating the sliding body 2. 2. The method according to claim 1, wherein the forging press is a Scotch yoke press, and the scotch yoke 6 traverses in the sliding body 2 slantingly slid in the sliding chamber 15 formed in the fixed body ram. A knockout device for a forging press, characterized in that a roller 45, which comes into pressure contact with the bottom surface of a cam plate 61 attached to the bottom portion, is provided at the tip of the operating pin 42, and the tip of the projecting pin 41 coincides with the bottom surface 17 of the ram. 3. The knockout bar 71 according to claim 1, wherein the forging press is biased toward the side opposite to the die, and the knockout 7 for lowering the knockout bar 71 against the biasing force.
A knockout device for a forging press, characterized in that the roller 45 at the tip of the operating pin 42 is urged so as to come into pressure contact with the knockout bar 71, and the tip of the projecting pin 41 coincides with the bottom surface 73 of the adapter 72. 4. The forging press die height adjusting device 8 according to claim 1, wherein the die height adjusting device 8 is slid between two inclined surfaces housed in a bolster 82, and is actuated to a surface of a knockout lever 83 in the bed 81. A knockout device for a forging press, characterized in that the roller 45 at the tip of the pin 42 is in pressure contact with the tip of the protruding pin 41 and the upper surface 84 of the bolster 82.