JPH05228566A - Manufacture of two piece rim - Google Patents

Abstract

PURPOSE:To manufacture a two piece rim, in which material loss during forming is less and crack and deformation are difficult to occur at the flange part. CONSTITUTION:At the position corresponding to the flange 2 at the time of completion of a first process, a plate-like aluminum extruded material 4 formed into the necessary thickness is curled as cylindrical shape and end parts 6 are mutually welded to form the cylinder 8. By using dies 10, 12 at a second process, the end part of a dropping part side is pressed toward the inside of the cylinder 8 to form the cylinder 8 having an annular plate 14. In a third process, the cylinder 8 having the annular plate 14 is fitted to a die 16, and a spinning work is applied by using the annular plate 14 as the starting point to finish the desired shape rim.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a split rim used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a split rim, an aluminum disc is used as a starting material and processed into a desired shape by pressing or spinning.

[0003]

In the rim formed by this method, the flange tends to be thinned by pressing or spinning. For this reason, this portion becomes weak in strength, and cracks and deformations occur, and when the tire is mounted, air leakage easily occurs from here.

In order to solve this problem, curling of the flange has been generally performed recently, but another problem has been pointed out. That is, cracks are likely to occur in the curl portion during curling, and the treatment liquid remains in the curl portion during surface treatment, which causes defects.

Further, in the above-mentioned conventional example, after pressing or spinning the disc, the inside is hollowed out, so that the material loss is large.

The present invention has been made to solve these problems, and provides a method for manufacturing a split rim in which the loss of material during molding is small and the strength of the flange is not deteriorated. The purpose is to

[0007]

The method for manufacturing a split rim according to the present invention is characterized by having the following three steps.

First step: At the time of completion, a plate-shaped aluminum extruded material having a wall thickness formed in advance at a position corresponding to a flange is wound in a tubular shape, and ends thereof are welded to form a cylinder. At this time, the preformed thick portion of the plate-shaped aluminum extruded material may be solid or hollow.

Second step A die is used to press the end on the drop side toward the inside of the cylinder to form an annular plate.

Third step: A cylinder having an annular plate is fitted into a mold, and spinning is performed from the annular plate as a starting point to complete a rim having a desired shape.

[0011]

According to the method of the present invention, as the starting material, the plate-shaped aluminum extruded material in which the portion corresponding to the flange is preliminarily formed thick at the time of completion is used. Therefore, the flange of the final product after spinning is also thick. Becomes

[0012]

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

The rim shown in FIG. 1 is a split rim consisting of two parts, an inner rim A and an outer rim B. As shown in this figure, in the rim formed by the manufacturing method of the present invention, the flange 2 is formed thicker than other portions.

In the following description, the present invention will be described by taking the manufacturing method of the outer rim B as an example, but it goes without saying that this method can be applied to the inner rim A as well.

First step As a starting material, as shown in FIG. 2A, a plate-shaped aluminum extruded material 4 in which a position corresponding to the flange 2 is preliminarily formed thick at the time of completion and the other portions are flat is shown. use.
As shown in FIG. 2 (b), this material 4 is bent into a tubular shape,
The ends 6 are welded together to form a cylinder 8. In this cylinder, as shown in FIGS. 2 (c) and 2 (d), when completed, the portion corresponding to the flange 2 has a shape protruding outward from one end of the cylinder.

At this time, the pre-thickened portion 2 of the plate-shaped aluminum extruded material 4 may be solid as shown in FIG. 2 (a) or may be hollow as shown in FIG. May be.

Second Step As shown in FIGS. 2 (e) and 2 (f), the upper and lower molds 10 and 12 are used to press the end portion on the drop portion side toward the inside of the cylinder to form the annular plate 14. To do. In this way, FIG.
As shown in (g), a cylinder 8 having an annular plate 14 and a flange 2 at both ends is formed.

Third Step As shown in FIGS. 2 (h) and (i), a cylinder 8 having an annular plate 14 and a flange 2 is fitted in a mold 16 to form the annular plate 1
Spinning is performed starting from 4 to complete the rim B having a desired shape.

[0019]

According to the method of the present invention, since a plate-shaped aluminum extruded material in which a portion corresponding to the flange at the time of completion is preliminarily formed in a thick wall is used as a starting material, the final product after the spinning process also has a flange. It becomes thick. Such a thick flange is also strong in strength and is unlikely to cause cracks, so that air leakage is unlikely to occur even after the tire is mounted. Further, since there is no curl portion, the surface treatment is easy and the treatment liquid does not remain. Further, since the material is processed from the extruded material, no hollowing operation is required, and as a result, material loss is reduced.

Further, when the preformed thick portion of the plate-shaped aluminum extruded material is hollow, a light and strong rim is obtained.

[Brief description of drawings]

1 is a cross-sectional view of a rim manufactured by the method of the present invention.

FIG. 2 is a manufacturing process diagram illustrating the manufacturing method of the present invention.

FIG. 3 is a cross-sectional view of another example of the extruded material used in the first manufacturing process.

[Explanation of symbols]

 2 Flange 4 Plate-shaped aluminum extrusion material 8 Cylinder 14 Annular plate

Claims (3)

[Claims] 1. A method for manufacturing a split rim, which comprises the following three steps. First step: When completed, a plate-shaped aluminum extruded material (4) having a thickness corresponding to the flange (2) is formed in advance in a tubular shape.
The ends (6) are welded together to form a cylinder (8). Second step Using a die (10, 12), the end on the drop side is pressed toward the inside of the cylinder (8) to form a cylinder (8) having an annular plate (14). Third Step A cylinder (8) having an annular plate (14) is fitted into a mold (16), and spinning is performed using the annular plate (14) as a starting point to complete a rim having a desired shape. 2. The method according to claim 1, wherein the preformed thick portion of the plate-shaped aluminum extruded material (4) in the first step is muku. 3. The method according to claim 1, wherein the preformed thick portion of the plate-shaped aluminum extruded material (4) in the first step is hollow.