JPS59297B2 - forging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forging device, and particularly to a forging device for forging an undercut portion of a part having an anodur cut.

In the past, parts with undercuts were generally considered unforgeable, so they were forged with an undercut, and the undercut part was formed by machining, or as shown in Figure 1, a simple opening was formed. The undercut part was formed during the drawing process.

Forming by the above-mentioned mechanical processing requires a large number of man-hours, and forming by the mouth drawing process has a problem in terms of the accuracy of the undercut portion.

The present invention has been developed in view of the above-mentioned problems, and it is possible to forge an undercut portion in one step, the structure of the molding die is simple, and the molding die can be easily replaced. The purpose is to provide a forging device that has a small number of parts and facilitates mold management.

The configuration will be explained below based on the embodiment shown in FIG. 2 and below.

In this embodiment, an example in which an undercut portion of a pole joint housing, which is an automobile part, is molded will be described.

In Figures 2 and 3, the undercut part is straight,
In addition, the material A is shown in which the outer diameter of the inlet portion is molded into a shape larger than the product size.

FIG. 4 shows the apparatus of the present invention, in which 1 is a lower die fixed to a lower die set 2, and 3 is an upper die fixed to an upper die set 4.

The lower mold 1 and the upper mold 3 are shaped to form the outer shape of the pole joint housing.

A punch 5 is held by a slide 6 and urged downward by a spring T, and the tip of the punch 5 is formed into a conical shape.

Reference numeral 8 denotes a collet fitted to the punch 5 so as to be movable in the axial direction. Collet pieces 8a are provided which are divided into comb-like shapes in the circumferential direction by vertical slits 9.

The conical portion of the punch 5 is opposed to the inside of each collet piece 8a in a wedge shape.

The outer shape of each collet piece 8a is formed so that it has an undercut inner surface finish shape of the material A in its expanded state.

Collet 8 slides hook out 1 via pin 10
1, and material A is also knocked out 1.
2. It is held down by a slide knockout 11 via a pin 10.

13 is the lower knockout pin.

In the above configuration, when the slide 6 descends, the collet 8 enters the material A first.

Thereafter, when the punch 5 is moved downward by the spring 7, the collet piece 8a is expanded by the conical part of the punch 5, and its outer surface contacts the inner surface of the material A.

When the slide 6 further descends, the upper die 3 draws the outer periphery of the opening entrance of the material A.

As a result, the inner surface of the material A is deformed so that it exactly contacts the outer shape of the collet piece 8a, and a spherical surface with an undercut is formed.

When the slide 6 begins to rise after forming, the knockout action causes the punch 5 to rise, and the conical part of the punch 5 separates from the collet piece 8a.

As a result, each collet piece 8a contracts in the direction perpendicular to the axis, and a gap is created between the outside of the collet piece 8a and the inside of the molded product.

When the slide 6 further rises, the collet 8 along with the upper mold 3
is raised and the collet 8 is removed from the molded product.

When near top dead center, the press knocks out pin 1.
2, the molded product is taken out from the lower mold 1.

The present invention is as described above, and is a forging device that attempts to forge a molded product having an open end at one end and an undercut inside the opening from a raw material A with an open end. A lower mold 1 for receiving the side portion, an upper mold 3 connected to a slide 6 of a forging device and drawing the outside of the opening entrance of the material A by the downward movement of the slide 6, and forming the tip into a conical shape. and has a punch 5 coupled to the slide 6, and a cylindrical part fitted to the punch 5 so as to be movable in the axial direction, and protrudes from the cylindrical part in a comb-teeth shape in the circumferential direction,
and a collet 8 having a plurality of collet pieces 8a with the outer shape of the tip part shaped like the inner shape of the molded product, and the conical part of the punch 5 is wedge-shaped inside the collet pieces 8a of the collet 8. Since the forging device is constructed so as to face the forging device, it is possible to forge a component having an undercut in one step using this forging device.

In addition, the only parts for forming the undercut part are a punch 5 with a conical tip and a single collet 8 fitted with the punch 5, which is simple in construction and makes it easy to replace these molds. It can be done easily.

Further, since the number of parts is small, mold management can be made easier.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a part having an undercut formed by conventional forming means, Fig. 2 is a sectional view showing an example of the material of the part having an undercut, Fig. 3 is a plan view thereof, and Fig. 4 is a sectional view of a part having an undercut.
The figure is a sectional view showing an embodiment of the present invention, and FIG. 5 is a sectional view taken along the line v--■ in FIG. 4. A is the material, 1 is the lower die, 3 is the upper die, 5 is the punch, 6 is the slide, 8 is the collet, and 8a is the collet piece.

Claims (1)

[Claims] 1. In a forging device that attempts to forge a molded product having an open end at one end and an undercut inside the opening from a material A having an open end, a lower die 1 that receives the other side of the material A is used. , an upper mold 3 connected to a slide 6 of the forging device and drawing the outside of the opening entrance of the material A by the downward movement of the slide 6; and a punch 5 having a conical tip and connected to the slide 6. The punch 5 has a cylindrical part that is fitted in the punch 5 so as to be movable in the axial direction, and the cylindrical part protrudes from the cylindrical part in a comb-teeth shape in the circumferential direction, and the outer shape of the tip part is shaped like the inside of the molded product. A plurality of collet pieces 8a formed into a shape
A forging device comprising a collet 8 having a collet 8, and a conical portion of the punch 5 facing inside a collet piece 8a of the collet 8 in a wedge shape.