JPS594937A - Forming of bowllike article - Google Patents

Abstract

PURPOSE:To obtain a bowllike article simply and at high yield without requiring much labor, by swaging a material having cylindrical body by upper and lower dies to a specified shape. CONSTITUTION:A material of bar steel cut to desired length is upset by hot upsetting and an intermediate worked product 11 having a small axial length and enlarged section is obtained. Then, this is made to an intermediate worked product 11' provided with a cylindrical body 12 having an opening in the upper part and a thin part at the top which is gradually thickened toward bottom. This work is made by thrusting the projecting part of a male die in the intermediate product supported in a female die. Then, swaging is performed to bend the inner and outer faces of the body inward. For this purpose, outer face of the bottom of the product 11' is supported by a hollow part 13 provided with a lower die having spherical inner face and an opening in the upper part. The product 11' is covered with a hollow part 15 provided with an upper die having spherical inner face and an opening in the lower part. The upper die 16 is lowered to the limit position of lowering shown by a chain line, and outer face of the body 12 is bent along the wall of the hollow 16. At the same time, inner face of the body is bent similarly. A round hole 17 is pierced on the bottom of the intermediate product 11' and surface finished to obtain a product.

Description

[Detailed description of the invention] This invention relates to a method for forming a jelly-like material.

Conventionally, a cage for a loop-shaped object, such as a cage for a constant-velocity rotary joint, has been formed by machining the inner and outer surfaces of a body 2 of a pipe-shaped material 1 into a spherical surface curved as shown by a chain line, as shown in FIG.

However, with this method, a large amount of chips are generated during the molding operation, and separate work is required to dispose of the chips, which increases the number of steps, reduces work efficiency, and reduces yield. There were drawbacks such as.

The object of the present invention is to provide a method for molding a gel-shaped snout that eliminates the drawbacks of the conventional methods as described above, allows easy molding with a small number of steps, and has a high yield. It is.

In order to achieve the above object, the method for forming a mesh according to the present invention is such that the bottom outer surface of a material having a cylindrical body is supported by a lower mold, the inner surface is spherical, and the lower part is open. An upper mold having a cavity is fitted onto the upper part of the material and lowered to curve the outer surface of the body of the material along the cavity wall and curve the inner surface of the body in the same manner as a book. It is something to do.

The present invention will be explained with reference to the embodiments shown in FIG. 2 and subsequent figures.

In this example, the cage of a constant velocity rotary joint is taken as an example. The third step of processing (C) and the fourth step of punching (
It consists of (b).

This will be explained in detail according to the order of each step,
First, a steel bar material cut to a desired length is upset by hot upsetting, and is formed into a large piece 11 with a short axial length and an enlarged cross section (4).

Next, the upholstered intermediate workpiece 11 is formed into a cylindrical body 11' having a thinner top, a cylindrical body 12 that gradually becomes thicker toward the bottom, and is open at the top (B). For this molding, for example, a male mold having a protrusion on the lower part having an outer diameter approximately equal to the inner diameter of the body part 12, and a female mold having a concave part on the upper part having an inner diameter approximately equal to the outer diameter of the body part 12 are used. This is done by pushing the protrusion of the male mold into the intermediate workpiece 11 supported in the recess of the mold.

Once this has been done, the inner and outer surfaces of the body 12 are then swaged to curve inward, but this process requires swaging the inner surface to be spherical and the upper part to be open, as shown in FIG. Using a lower mold 14 having a cavity 13 with a spherical shape, and an upper mold 16 having a cavity 15 with a spherical inner surface and an opening at the bottom, the cavity 13 of the lower mold 14 supports the outer surface of the bottom part. The cavity 15 of the upper mold 16 is placed in the upper part of the intermediate product 11'.
is fitted, and the upper die 16 is lowered to the lowering limit position indicated by the chain line. Then, the intermediate product 11' is curved so that the outer surface of the body 12 overflows the wall of the cavity 15, and the body 11 is curved.
The inner surface of 2 is similarly curved (C). When the swaging process is completed as described above, the upper die 16 is raised and the body 1
Next, holes are drilled on the bottom of the intermediate workpiece rf, which has been curved (2). The drilling process is performed by an appropriate drilling method such as a method using a punch die and a punch die, a core punch method, etc., and thereby a circular hole 17 is punched in the bottom of the intermediate workpiece 11'. On this occasion,
Almost no deformation occurs near the bottom of the intermediate product 11'.

The curved body 12 of the product completed in the above manner is provided with a plurality of holes for supporting the support in the circumferential direction, and finally, necessary surface finishing such as sawing is performed, and the product is finished. I can do it. In addition, in the above embodiment, the cylindrical body of the intermediate product was formed to be thin at the top and gradually thicken toward the bottom, but it may also be formed to have the same thickness from the top to the bottom. Conversely, the bottom side may be formed thinner. Also, the bottom hole may be drilled before swaging. In this case, during swaging,
The hole is drilled by protruding a punch or the like into the circular hole 17 punched out by machining to prevent the branch hole from deforming. Further, although the above-mentioned embodiments show a forming method using hot working, it goes without saying that other methods such as warm working or cold working may also be used.

As described above, according to the molding method of the present invention, there is no need to cut the inner and outer surfaces of the body as in the conventional method, so molding can be easily performed with fewer steps, and the yield can be reduced. It has excellent effects such as being able to improve the quality of the product.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of the conventional method, Figure 2
c) is an explanatory diagram of each molding process showing one embodiment of the present invention;
FIG. 3 is an explanatory view showing the arrangement of the material and the upper and lower dies in the third step of swaging. 11.11', 11', 11''...Intermediate processed product 12.
...Cylindrical body 14...lower mold 1,6...upper mold Patent applicant Daido Steel Co., Ltd. (C) Ame 3 Kon 6 1' wo Oka (B) (D)

Claims (1)

[Claims] 1. The bottom outer surface of the material having a cylindrical body is supported by a lower mold, and the upper mold having a cavity with a spherical inner surface and an opening at the bottom is fitted onto the upper part of the material and lowered. and curve the outer surface of the body of the material along the cavity wall,
A method for molding a lug-shaped object, characterized in that the inner surface of the body is similarly curved.