JPS6028571B2 - Pipe flanging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe flanging method.

Conventionally, in order to process a product that has a small flange on one end surface of a pipe as shown in Figure 1, '1} Machining a material that has a circumference that takes into account turning allowance for the outside diameter of the small flange. Methods such as ① Press molding method and 3-cavity cold forging method are adopted.

However, [1] the method using machining has poor gait during anchor cutting, and [2] the method using press molding requires two steps as shown in Figure 2, resulting in poor productivity. A large one is required. '3} The cold forging method requires surface treatment of the material in order to improve lubricity as a pre-process. SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe flanging method that eliminates the above-mentioned drawbacks, improves handling, and improves productivity.

More specifically, the purpose is to improve productivity by eliminating the need for a core or the like for guiding the inner periphery of a pipe-shaped material. In order to achieve this purpose, the pipe flanging method of the present invention uses a pipe-shaped material 1
A chamfer C process is applied to the inner end surface, and the material 1 is made to protrude by the amount of the flanging process, and is fixed using a pick-up tool 2 that supports the outer periphery of the material, so that it is installed at an angle from the material axis and makes line contact with the end surface of the material. This pipe flanging method is characterized in that a small flange portion 4 is formed on one end surface of the pipe by pressurizing the attached tool 3 while rotating it against the marking line of the material.

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 3, 1 is a pipe-shaped material, 2 is a jig, and 3 is a pipe-shaped material.
is a tool. As shown in FIG. 4, the pipe-shaped material 1 is provided with a suitable chamfer C on its inner end surface.
The material 1 is installed in the jig 2 with a small flange portion left in the upper part as shown in the figure. The tool 3 is attached at an angle a with respect to the axis of the workpiece 1, and the workpiece 1 and the tool 3 are in line contact. The tool 3 applies pressure downward in the figure while rotating with respect to the axis of the material 1. When the tool 3 applies pressure downward in the drawing while rotating, the material 1 is plastically deformed to form the small flange portion 4.

At this time, since the inner end surface of the material is chamfered C, it does not bulge inside the material. Further, the shape of the small flange portion 4 can be changed by appropriately selecting the size of the chamfer C and the dimension between the end surface of the material and the lining. Such machining is effective when used, for example, for machining a stator shaft 20 of a torque converter 10 of an automatic transmission as shown in FIG.

As explained above, the present invention relates to a pipe flanging method.

According to the present invention, the outer diameter of the material does not have to be the outer diameter of the small flange portion, and the turning allowance for the outer diameter of the pipe is taken into consideration, and the cutting speed is significantly improved compared to machining.

In addition, since the metal flow of the product follows the shape of the small flange, the strength of the product is increased compared to turned products. In addition, the processing machine can be a small equipment such as a commercially available lj betting machine, eliminating the need for large-scale equipment such as press molding, and the processing process can be completed in one step, resulting in high productivity.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a pipe-shaped product having a small flange portion, Fig. 2 is a view showing a method for forming the small flange portion by press molding, and Fig. 3 is a view showing a flanging method for a pipe according to the present invention. 4 is an enlarged view of a pipe-shaped material, and FIG. 5 is a sectional view showing a stator shaft of an automatic transmission in which the pipe flanging method of the present invention is utilized. Explanation of symbols 1...Pipe-shaped material, 2...Jig, 3...
- Tool, 4... Small flange part, 10... Torque converter, 20... Stator shaft, C... Chamfering. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A material in which the inner end surface of a pipe-shaped material is chamfered, the material is made to protrude by the amount of the flange processing, and is fixed using a jig that supports the outer periphery of the material, and is attached at an angle from the material axis. A pipe flanging method characterized by forming a small flange portion on one end surface of the pipe by applying pressure while rotating a tool attached so as to make line contact with the end surface of the material while rotating about the axis of the material. 2. The pipe flanging method according to claim 1, wherein the shape of the small flange portion is selected depending on the size of the chamfer of the raw material and the size of the portion projected from the jig.