JPH0225224A - Opposed hydraulic forming device - Google Patents

Abstract

PURPOSE:To simultaneously perform opposed hydraulic drawing and bending by one process by constituting the title device so that a punch is provided with a bending part on the outer surface, and a slide punch which can slide in the horizontal direction, and a driver punch for extending forcibly the slide punch are provided. CONSTITUTION:When a slide 3 is lowered, a punch mechanism 4 is brought into contact with a blank W, and it is pushed into a pressure dome 1. As a result, opposed hydraulic pressure is generated in the pressure dome 1, the blank W is wound strongly to wall parts of slide punches 7a, 7b and a driver punch 8, and as the punches go in, opposed hydraulic drawing is executed. On the slide punches 7a, 7b, groove-like bending parts 70, 70 are provided, and opposed hydraulic pressure works on the blank positioned in this part, as well. Therefore, a material is bent simultaneously with drawing, and bending which conforms with a shape of a bending part is executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an opposed hydraulic forming apparatus.

[Conventional technology and its technical issues]

When forming a thin plate with a recess in a part of the product, for example, a part of the side wall, conventionally, after drawing a cylinder with dimensions corresponding to the bottom of the recess, internal pressure is applied to the parts other than the part where the recess is to be formed. The bulge forming method was used to inflate the product, or a method was used in which a cylinder of the size of the product was drawn, and then a concave portion was formed partially using a mold.

However, these methods require two steps, resulting in poor productivity and high costs.

The present invention was devised to solve the above-mentioned problems, and its purpose is to easily and inexpensively produce products with irregularly shaped parts such as concave parts and convex parts in one process. An object of the present invention is to provide an opposed hydraulic molding device that can perform molding.

[Means to solve the problem]

To achieve the above object, the present invention provides an apparatus comprising a pressure dome filled with liquid, a punch pushed into the dome, and a wrinkle presser for pressing a blank on the pressure dome, wherein the punch has a bent portion on the outer surface. It has a structure that includes a slide punch that can slide horizontally and a driver punch that forcibly spreads out the slide punches, which allows opposing hydraulic pressure drawing and bending to be performed simultaneously in one process. be.

In order to sharpen the shape of irregularly shaped products, the pressure dome may be provided with a partial mold mechanism that advances against the bending process of the slide punch.If a hydraulic restriter method is adopted, the punch can be attached using a screwdriver at the location. A locking mechanism may be provided to restrict lifting of the punch.

〔Example〕

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

1 to 3 show one embodiment of the present invention.

Reference numeral 1 denotes a pressure dome, which is disposed on the bed, has a liquid supply part 1a provided at a suitable position such as the bottom, and is connected to an external opposing hydraulic pressure control device A via piping. Opposing hydraulic pressure control device A
is equipped with a pump, control valve, etc., like the known ones. 2 is a die superimposed and fixed on the upper surface of the pressure dome 1.

3 is a main slide that is raised and lowered by a main cylinder (not shown).

Reference numeral 4 denotes a blank holder mechanism, and the blank holder mechanism 4 has a wrinkle presser plate 4a that pinches the workpiece W between it and the die 2, and the wrinkle presser plate 4a has an annular mounting plate 4b.
The presser cylinder 4 is fixed to the main slide 3 and is attached to the main slide 3.
The piston rods 40, 40 extending from the piston rods 4c, 4c are connected to the piston rods 40, 40, respectively.

5 is a punch mechanism that is a feature of the present invention. The punch mechanism 5 includes a hollow bracket 6 fixed to the lower surface of the main slide 3 via a base, and two slide punches 7a attached to the bracket 6 so as to be movable only in the horizontal direction. 7b and those slide punches 7a,
A driver punch 8a that can be freely raised and lowered is provided in the middle of the punch 7b.

Specifically, each of the slide punches 7a and 7b has a bent portion 70 on at least one side wall surface. Although the bent portion 7o is a U-shaped groove in the embodiment, it is not limited to this. The slide punches 7a, 7b
is like the second m.

71.71 (or dovetail groove) is formed at the top,
This is mounted in a dovetail groove (or dovetail) 61, 61 provided on the lower surface of the bracket 6, so that it can slide in the horizontal direction.

Slanted cam surfaces 72, 72 are formed on opposing sides (inner sides) of both slide punches 7a and 7b, and biasing is applied between both slide punches 7a and 7b in a direction to approach them. Biasing means 9, 9 are arranged to do this.

Although a tension spring is used as the biasing means in this embodiment, a fluid may also be used.

The driver punch 8 is the slide punch 7a.

It has a cam surface 82° 82 corresponding to the cam surface 72.72 of 7b, and is installed by fitting into both slide punches 7a and 7b through an opening 60 provided in the center of the bracket 6, and fixed to the main slide or base. Lifting actuator 1
It is connected by a working iron 100 of 0, and is raised and lowered by this.

The driver punch 8a has slide punches 7a and 7b at the tip.
A board part 81 is provided which aligns with the lower surface line of the board part 81, and vertical grooves 83, 8 are provided above the board part 81 to avoid the bias means 9, 9.
3 is provided.

FIG. 4 shows another embodiment of the present invention, in which the bending portion 70 is provided only on one slide punch 7b, and therefore the cam surface 72 is also provided on this slide punch 7b.
The cam surface 82 of the driver punch 8 is also formed only on one side.

FIGS. 5 and 6 show a striking device suitable for shaping the irregularly shaped part into a sharper shape. FIG. 5 shows a mechanical restrike, in which a bending part 7 is placed on the side wall of the pressure dome 1 or in the area applied to the die 2.
A partial mold [with a partial mold 12 having a mold surface corresponding to 0] and an actuator 13 such as a cylinder that advances and retreats the partial mold [
911.

FIG. 6 shows a case where a restrike is performed by increasing the liquid pressure inside the pressure dome 1.The mounting is performed by attaching several actuators 15, 1.5 to the bracket 6 and the operation of these actuators 15.15. A stopper 16.16 extends toward the driver punch 8 and restricts it from floating.
A locking mechanism 14 is provided.

It goes without saying that the blank holder mechanism 4 and the punch mechanism 5 may be provided on separate slides.

[Effect of the embodiment]

Next, the usage and operation of the device of the present invention will be explained.

During molding, the lifting actuator 10 is activated in advance at the upper limit position to lower the driver punch 8. As a result, the slide punches 7a and 7b, which were biased toward each other by the bias means 9.9,
By pushing the driver punch 8, it is moved left and right against the bias means 9, 9, and the cam surfaces 72, 72, 82, 82
They press into contact with each other, and the plate part 81 of the driver punch 8 aligns with the lower surface of the slide punch, thereby forming a molded product-shaped punch.

In this state, liquid (oil, water, etc.) is supplied into the pressure dome 1 by the opposing hydraulic pressure control device A, the blank W is placed on the die 2, and then the main slide 3 is lowered. By lowering the slide 3, Since the wrinkle pressing plate 5a is in contact with the blank W, the blank W is wrinkled and pressed by the die 2, and in this state, the punch mechanism 4 comes into contact with the blank W and pushes it into the pressure dome 1.

As a result, an opposing hydraulic pressure is generated above the pressure dome, and this opposing hydraulic pressure pushes the blank W into the slide punches 7a and 7b.
and is strongly wound around the board part 81 of the driver punch 8,
As the punch enters, opposed hydraulic drawing is performed. Moreover, it is a slide punch 7a.

7b has a groove-shaped bending part 70.70, and the blank located in this part is also affected by the opposing hydraulic pressure, so
The material is bent at the same time as drawing, and the bending process is performed in accordance with the shape of the bent part. In other words, partial constrictions are also processed all at once. This state is shown in FIG.

When the above molding is completed, the opposing hydraulic pressure in the pressure dome 1 is removed by the opposing hydraulic pressure control device A, and at the same time, the lifting actuator 1o is operated in reverse to raise the tribar punch 8. As a result, the left and right slide punches 7a, 7
b are moved toward each other by the urging force of the biasing means 9.9.

That is, the punch reduces in size. As a result, the formed portion W8 formed by the bent portions 70, 70 of the molded product W' is automatically released from the slide punches 7a, 7b. This is the state shown in FIG.

All that is left to do now is to raise the main slide 3, leaving the molded product W' in the pressure dome 1 as shown in FIG. The molded product W' can then be taken out.

In order to sharpen the shape of the irregularly shaped portion, the mechanism shown in FIG. 5 or 6 may be used. That is, in the case of mechanical restriking, the actuator 13 is operated with the opposing hydraulic pressure removed, whereby the partial mold 12 advances into the pressure dome 1, and the molded part W is further pushed through the slide punch. In order to press into the bent portions 70 and 70 of 7a and 7b, shaping molding is performed.

In addition, when restriking is performed using the opposing hydraulic pressure, the opposing hydraulic pressure control device A rapidly increases the magnitude of the opposing hydraulic pressure at the end of opposing hydraulic forming, and just before that, the actuator 15.1
This actuates the stoppers 16, 16.
moves forward, and the movement of the driver punch 8 in the upward direction is forcibly restricted.

Therefore, the punch is reliably locked in the proper shape, and the irregularly shaped portion W1 is brought into close contact with the bent portion 70, 70 by the high liquid pressure in the pressure dome.

Note that the present invention can be applied to cases where the product has an irregularly shaped part not only in a part of the circumferential direction but also in a part of the height direction, and furthermore, when it has a ring-shaped irregularly shaped part (concave or convex) in the circumferential direction. Of course, it is possible to do so.

〔Effect of the invention〕

According to the present invention as described above, an excellent effect can be obtained in that a thin plate molded product having irregularly shaped parts such as a bulge, a recess, or a constriction in a part of the side wall can be manufactured efficiently and inexpensively in one process.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the opposed hydraulic device according to the present invention, Fig. 2 is a front view showing the slide punch and the mounting bracket in the present invention, and Fig. 3 is the same as Fig. 1.
4 is a sectional view showing another embodiment of the present invention, FIG. 5 is a half sectional view showing an example of the restrike mechanism of the present invention, and FIG. 6 is a sectional view taken along the line - ■. FIGS. 7 to 10 are cross-sectional views showing the like mechanism, and FIGS. 7 to 10 are cross-sectional views showing the molding process according to the embodiment of FIG. 1. 1... Pressure dome, 4... Blank holder mechanism, 5
... Punch mechanism, 7a, 7b... Slide punch,
8...driver punch, 9,9...bias means,
70...Bending forming part. Patent Applicant Amino Iron Works Co., Ltd. Agent Patent Attorney Kuro 1) Yasushi Buddhist Painting 2 Figure 7a (7b) Figure 1 Figure 4 Figure 5 Figure 7

Claims (3)

[Claims] (1) In an apparatus comprising a pressure dome filled with liquid, a punch pushed into the same, and a wrinkle presser for pressing the blank on the pressure dome, the punch has a bent portion on the outer surface,
An opposed hydraulic forming device characterized by comprising a slide punch that can slide in the horizontal direction and a driver punch that forcibly spreads out the slide punches. (2) The opposed hydraulic forming apparatus according to claim 1, wherein the pressure dome is provided with a partial mold mechanism that can move forward and backward with respect to the bending portion of the slide punch. (3) The opposed hydraulic forming apparatus according to claim 1, further comprising a locking mechanism for restricting floating of the driver punch at the punch attachment site.