JPH0289529A - Spin-forming method - Google Patents

Abstract

PURPOSE:To easily fit a stock cylinder along the forming surface of a mandrel by protruding the peripheral edge part of a stock cylinder from the highest projecting part of the forming surface of the mandrel when the stock cylinder to be formed is put round the forming mandrel. CONSTITUTION:For example, a rear rim stock cylinder 3 is forged or cast integrally with the rear peripheral edge of the disk part D of the wheel stock 1 for a vehicle. This stock 1 is installed on the mandrel 4. In this case, a clearance S is formed between the stock cylinder 3 and the rim forming surface 41 of the mandrel 4 and the front end part 32 of the stock cylinder 3 is protruded from the rim flange forming surface 42 of the mandrel 4 (corresponding to the highest projecting part). The mandrel 4 is rotated round the axis 43 and the stock cylinder 3 is ironed by a rotary pressure tool 5 in the direction of an arrow to form the rear rim 31, further, the wheel W. By this method, small friction is found between the stock cylinder 3 and the formed surface 41 and forming can be performed easily.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a spinning molding method.

[Conventional technology]

Conventionally, when spinning a vehicle wheel W, for example, as shown in FIG.
get. Then, this material 1 is placed on a rim forming mandrel 4.
The rim portion 31 was formed by squeezing the rim portion 31 in the direction of the arrow with a rotary pressing tool 5 while the rim portion 31 was fitted onto the outer surface of the
No. 5640).

[Problem to be solved by the invention]

However, in such a conventional spinning forming method, when the material tube to be formed (rim material tube) 3 is installed on the forming mandrel (rim forming mandrel) 4, the material tube to be formed (rim material tube) 3 was in close contact with the molding surface 41 of the molding mandrel (rim molding mandrel) 4.

Therefore, when the material tube 3 is squeezed with the rotary pressing tool 5, friction occurs between the material tube 3 and the forming surface 41 of the mandrel 4, and as a result, the material tube 3 is pressed against the convex part (rim) of the forming surface 41. This had the disadvantage that it took a lot of effort to squeeze along the flange molded part.

The object of the present invention is to solve this problem.

[Means for solving the above problems]

In order to solve the above problems, in the spinning forming method of the present invention, a material tube to be formed is integrally formed on the peripheral edge of the sandwiched plate portion, and the material tube to be formed is fitted onto a forming mandrel. In a spinning forming method of forming a predetermined shape by spinning, when the material tube to be formed is placed on the forming mandrel, the peripheral edge of the material tube to be formed is set at the highest forming surface of the forming mandrel. It is made to protrude beyond the convex portion.

[Action of the invention]

Since the spinning forming method according to the present invention is configured as described above, when the material tube to be formed is squeezed along the forming surface of the mandrel, the material tube to be formed is stretched along the convex portion of the forming surface. It's easy to get used to.

[Explanation of Examples]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a method for manufacturing a vehicle wheel will be described below based on the drawings.

In FIG. 1, D is a disk portion of a vehicle wheel material 1 (corresponding to the "held plate portion" of the present invention), and 2 is a disk portion integrally formed on the front side peripheral edge of this disk portion by forging or casting. This is the front rim part. 3 is the back rim material tube (
This corresponds to the "formed material cylinder" of this invention. ), and is integrally formed on the back side peripheral edge of the disk portion by forging or casting like the front rim portion 2. This back side rim material tube 3 becomes a back side rim portion 31 by spinning molding.

The vehicle wheel material 1 constructed in this manner is placed on a mandrel 4. In this case, a gap S is formed between the back side rim material cylinder 3 and the rim forming surface 41 of this mandrel 4, and the angle θ between the back side rim material cylinder 3 and the rim forming surface 41 is preferably about 8 degrees. . Further, the tip end 32 of the rim material cylinder 3 protrudes beyond the rim flange forming surface (corresponding to the "highest convexity" of this invention) 42 of the mandrel 4 (
(in the radial direction of the disc).

Then, by rotating the mandrel 4 around the axis 43 and squeezing the back rim material cylinder 3 in the direction of the arrow with the rotary pressing tool 5, the material cylinder 3 is sequentially deformed into the state shown by the imaginary line and moved from the right side to the left side. ), the back rim 31, and eventually the vehicle wheel W are formed.

Note that 6 is a pressing plate for clamping and fixing the wheel material 1 to the mandrel 4.

〔Effect of the invention〕

In the spinning forming method according to the present invention, a material cylinder to be formed is integrally formed on the peripheral edge of a sandwiched plate portion, and a predetermined shape is formed by spinning forming the material cylinder to be formed while being fitted onto a forming mandrel. In the spinning forming method, when the material tube to be formed is placed on the forming mandrel, the peripheral edge of the material tube to be formed is made to protrude beyond the highest convex portion of the forming surface of the forming mandrel; When the material tube to be formed is squeezed along the forming surface of the mandrel, the material tube to be formed easily conforms to the convex portion of the forming surface.

Therefore, if this spinning forming method is used, it is easy to form the material cylinder to be formed along the convex forming surface (of the mandrel).

[Brief explanation of the drawing]

Fig. 1 is a drawing showing an embodiment of the spinning forming method according to the present invention, and is a sectional view of a vehicle wheel material placed on a mandrel, and Fig. 2 is a diagram of a conventional example corresponding to Fig. 1. be. D... Disc part (held plate part) 3... Back side rim material cylinder (formed material cylinder) 4... Rim forming mandrel (molding mandrel) 41... Rim forming surface (molding surface) 42...
Rim flange molding surface (highest convex part) clause 5 Σ

Claims (1)

[Claims] (1) Spinning forming, in which a tube of material to be formed is integrally formed on the peripheral edge of the sandwiched plate portion, and the tube of material to be formed is fitted onto a forming mandrel and then subjected to spinning molding to form a predetermined shape. In the spinning method, when the material tube to be formed is placed on the forming mandrel, the peripheral edge of the material tube to be formed is made to protrude beyond the highest convex portion of the forming surface of the forming mandrel. Molding method.