JPS625803Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for double-acting a die in a single-acting forging press.

One of the forging methods is closed forging. According to this method, there is no chance of burrs forming on the forged product.
Good yield. Although the closed forging method has such advantages, it has not become very popular at present because it requires complicated movements of the mold during processing and requires a double-action press. However, in recent years, this forging method has been reconsidered from the perspective of resource conservation.

This invention was made in view of the above-mentioned circumstances, and aims to provide a device capable of double-acting a die in a single-acting forging press so that closed forging can be performed.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

In this specification, the front and rear refer to the left side with reference to FIG. 1, and the left side to the front, and the opposite side to the rear.

FIG. 1 shows a working part in a forging press. That is, in FIG. 1, 1 is a slide that moves up and down as the crankshaft (not shown) rotates, 2 is a bolster, 3 is a bed, 4 is an upper die attached to the lower surface of the slide 1, and 5 is a slide. A lower mold consisting of a movable mold 5A and a fixed mold 5B is shown. Fixed type 5B has Bolster 2
is attached to the top surface of the The movable mold 5A is supported by rods 6a of a plurality of cushion hydraulic cylinders 6 provided inside the fixed mold 5B. Pressure oil is supplied from a hydraulic source to this cylinder 6, and the movable type 5A is moved with the rod 6a protruding.
A predetermined distance is maintained between the fixed mold 5B and the fixed mold 5B. In these molds 4 and 5A, cavities 7A and 7B of required shapes are respectively carved from the mating surfaces. Furthermore, these molds 4, 5A, and 5B are provided with a guide member (not shown) that guides them when moving up and down. Furthermore, the upper die 4 has a punch 7.
An insertion hole 8 is provided. This hole 8 passes through the center of the upper die 4 in the vertical direction, and has a step formed approximately in the upper half, and has a larger diameter than the lower part. A flange 7a is formed at the upper end of the punch 7 and has an outer diameter that is approximately the same as the inner diameter of the large diameter portion of the punch insertion hole 8. A compression coil spring 9 is attached between the lower surface of the flange 7a and the step. The spring 9 acts to pull the punch 7 upward, thereby pressing the punch 7 against the lower surface of the slide 1. In this state, the lower end of the punch 7 extends into and forms a part of the cavity 7A of the upper die 4. A punch pin 10 is provided above the punch 7 so as to be movable up and down, and penetrates through the slide 1 to abut against the upper surface of the punch 7. Further, the lower die 5 is provided with a knockout pin 11 facing the punch 7. The knockout pin insertion hole 12 has a large diameter portion formed in the center of the movable mold 5A. Knockout pin 1
1 has a flange 11a fitted to the large diameter portion at its lower end, and is movable up and down within the range in which the flange 11a can move within the large diameter portion. When the knockout pin 11 is at the lower limit position, its upper surface constitutes a part of the cavity 7B. In addition, fixed type 5B, bolster 2, bed 3
A push rod 13 is provided passing through it. The upper end surface of the push rod 13 is flush with the upper surface of the fixed mold 5B.

A cross bar 14 is provided above the punch pin 10. In front of this crossbar 14,
Bracket 15 attached to the front of slide 1
There is a rocker arm 16 on which is supported. The cross bar 14 has a rear end rotatably attached to the rear surface of the slide 1 by a pin 1A, crosses above the punch pin 10 in the front-rear direction, and has a front end extending below one end of the rocker arm 16. A protruding portion 14A having an arcuate cross section is formed on the lower surface of the intermediate portion of the cross bar 14. This protrusion 14A is located directly above the punch pin 10, and comes into contact with the upper end of the punch pin 10 when the cross bar 14 rotates. The rocker arm 16 is rotatably supported by a pin 17 at the tip of the bracket 15 at its intermediate portion. Rotatable rollers 16A and 16B are attached to both ends of the rocker arm 16, respectively. In bracket 15,
A stopper 15A is provided which comes into contact with the upper surface of the rocker arm 16 in a substantially horizontal state, and the rotation range of the rocker arm 16 is restricted by the stopper 15A, and the rocker arm 16 cannot rotate counterclockwise from the horizontal state. Further, there is a coil spring 18 having one end attached to the front surface of the slide 1, and the other end connected to the vicinity of the front end of the cross bar 14. This spring 18 acts to constantly pull the front end of the crossbar 14 upward. As a result, the upper surface of the front end of the cross bar 14 and the roller 16A located above the cross bar 14 maintain contact with each other.

Furthermore, below another roller 16B attached to the opposite side of the roller 16A, a roller receiving bar 19 supported substantially horizontally by a hanging bolt 18 is disposed perpendicular to the front-rear direction.
The suspension bolt 18 is suspended vertically from the crown F of the press, and has a male thread 18 at its lower end.
A is provided. The screws 18a are inserted into through holes (not shown) drilled at both ends of the roller receiving bar 19, and the nuts 20 are screwed from above and below, thereby attaching the roller receiving bar 19 to the hanging bolt 18. There is. By changing the screwing positions of these nuts 20, the height of the roller receiving bar 19 can be adjusted.

Next, the forging operation of the above components will be explained with reference to FIGS. 2 and 3.

It is assumed that the material G is supplied to the cavity 7B of the lower die 5 by a feeding device (not shown). The material G has the necessary conditions to be subjected to closed forging processing. That is, the material G has a volume that can occupy just the right amount of the shape when it is molded into a product.
This is achieved, for example, by controlling the weight of the material G.

Assume that slide 1 is now at top dead center (Figure 2A). At this time, the cross bar 14 is in a tilted position with its front end portion being high, and a required clearance C is maintained between the protruding portion 14A and the punch pin 10. From this state, slide 1 moves a predetermined distance L
When descending, the roller 16B of the rocker arm 16
is in contact with the upper surface of the roller receiving bar 19 (FIG. 2b). Further, as the slide 1 descends, the rocker arm 16 rotates clockwise about the fulcrum and pushes down the front end of the cross bar 14 against the force of the spring 18. As a result, the crossbar 14 starts rotating counterclockwise about the fulcrum. During this period, as the slide 1 descends, the material G is compressed and spread into the cavities 7A and 7B (FIG. 2C). Further, as the slide 1 continues to descend, the upper mold 4 and the movable mold 5A are brought together and the material G is sealed in the cavities 7A and 7B. At this time, the cavities 7A and 7B are not completely filled with the material G and there are gaps. Further, a lower mold stroke distance S1 is secured between the movable mold 5B and the cushion hydraulic cylinder 6. When the material G is sealed in the cavities 7A, 7B, the protrusion 14A of the cross bar 14 and the upper end of the punch pin 10 eventually come into contact (FIG. 2D). After the movable molds 5B of the upper mold 4 and the lower mold 5 have warmed together, they maintain that state and push down the cylinder 6 to descend, reaching the bottom dead center. Meanwhile, during this time, the crossbar 14 further rotates and pushes down the punch pin 10. As a result, the punch 7 is pushed down against the spring 9, and as the slide 1 descends, its lower end protrudes into the cavities 7A, 7B and reaches the bottom dead center (FIG. 2E). During this time, the punch 7 presses the material G to fill the mold. As the slide 1 rises from the bottom dead center, each of the above-mentioned components performs operations opposite to those described above, and returns to the state shown in FIG. 2A at the top dead center. Furthermore, slide 1
During the rising process, the knockout pin 11 is projected upward by a separately provided drive device (not shown), thereby ejecting the molded product.

As described above, the material G is sealed in the upper and lower cavities 7A and 7B by descending into the slide 1, and then the material G is pressurized by the punch 9 which double-acts in response to the movement of the slide 1. Then, the mold is filled and sealed forging is performed. In addition, the punch stroke, start or stop position, speed, etc.
It should be set so as to give optimal deformation to the product shape. This is the clearance C, the installation height of the rotary support bar 19, and the rotary arm 16.
This can be easily achieved by changing the lever ratio of the crossbar 14.

In addition, in the above embodiment, the hydraulic cylinder 6 provided in the fixed mold 5B as a dictation device
However, the present invention is not limited to this, and it goes without saying that it may be built into the bed and operate as a lower mold together with the bolster.

As explained above, according to this invention, the material is sealed in the upper and lower mold cavities, and then the punch descends to pressurize the material and fill the mold, so an apparatus capable of performing closed forging is obtained. It will be done.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a side sectional view showing the structure of this invention, FIG. 2 is an explanatory view of the operation of the invented device, and FIG. 3 is a time chart showing the operation of the mold. 1...Slide, 4...Upper die, 5...Lower die, 7
...Punch, 14...Cross bar, 16...Rotsuka arm, 19...Roller receiving bar.

Claims (1)

[Scope of utility model registration request] Penetrates the upper die attached to the bottom of the slide,
and a punch that can be raised and lowered with respect to the upper die, a swinging member attached to the slide, and a receiving member that receives and swings one end of the swinging member during the downward stroke of the slide. A double-acting device in a single-acting forging press that consists of a punch lifting mechanism that pushes down the punch by swinging.