JPS6340629A - Formation of divided type rim - Google Patents

Abstract

PURPOSE:To form a divided type rim in a good shape without any material loss by linking the bend part coaxially integrally after bending the opposite side end parts of the inner and outer rims in which a pair of pipe materials in the prescribed length are subjected to a lancet forming in the axial direction respectively in the axial direction. CONSTITUTION:A pair of pipe materials in the prescribed length is inserted into a die and made the inner rim 3 and outer rim 4 in the prescribed shape with a lancet work 12. Linking parts 3d, 4d are formed by bending the opposite end parts of the well parts 3c, 4c of these rims 3, 4 with a lancet 12a work in the axial direction. Bolt holes holes 3c, 4c are blanked by a press on the peripheral side part of these linking parts 3d, 4d, which are integrally fixed by a bolt 5 with their back to back co-axially. There is no such a material loss as performing the blanking press work of the divided type rim from a slab and it is formed in a good shape. The linking parts 3d, 4d may be subjected so a lancet work to the external side and fastened with a bolt via a disk 6.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a rim that fits and supports a tire.

In particular, the present invention relates to a method of molding a split rim that is divided in the axial direction around a well portion.

(Prior art) As a conventional technology, by deforming the outer periphery of a pair of disk materials in the axial direction, for example, an inner rim intermediate product moves from the well part to one flange, and the inner rim intermediate product moves from the well part to the other flange. Then, the inner rim and the outer rim are formed by punching and removing the walls of the axial center of the inner rim intermediate product and the outer rim intermediate product, and then the both are coaxially and integrally formed at the outer end of the well. There was a method of molding a split rim that was connected.

(Problems to be Solved by the Invention) The above-mentioned conventional method requires a step of punching out and removing the axial center of the disc material, which has the drawback of increasing the number of steps and deteriorating the material yield. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new method for molding a split rim that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a pair of pipe materials formed to a predetermined length, and deforms each pipe material in the axial direction. , a pair of inner rims and outer rims that face each other in the axial direction are each molded, and then, after bending the opposite end portions of each inner rim and outer rim in the axial direction, the inner rim and the outer rim are formed at the bent portions. 11 are coaxially and integrally connected.

(Function) Since the present invention has the above-described configuration, the inner rim and the outer rim can be formed by simply deforming the pipe material into a predetermined shape in the axial direction.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, FIGS. 1 to 4 are process diagrams of a method for molding a split rim showing an embodiment of the present invention.

First, as shown in FIG. 1, a pair of pipe materials 1 and 2 are cut by cutting a pipe made of, for example, an aluminum alloy material into lengths corresponding to the inner rim and outer rim to be molded.
will be established. Note that the lengths of these pipe materials 1 and 2 are appropriately set depending on the type of the rim to be molded, such as the amount of offset.

Next, each of the pipe materials 1 and 2 is subjected to a spinning process, as shown in FIG.

That is, a mold 11 forming the inner rim or outer rim shape on the main shaft 10 of the machine tool, that is, from the left end to the right end, a large diameter flange molded part 11a, an intermediate diameter bead seat molded part], lb, and a small diameter well. A mold 11 having stepped molding portions 11c is attached.

Then, the pipe material 1 (or pipe material 2) is fitted to the outer circumference of the mold 11, and both are rotated by the main 4i11110, and the pipe material 1 (or pipe material 2) is pressed in the axial direction with the roller (spatula) 12. ) into the same shape as the mold 11 to form an inner rim 3 (outer rim 4) having a flange portion 3a (4a), a bead seat portion 3b (4b), a well portion 3c (4c) and a connecting portion 3d (4d).
) is molded.

In this case, the connecting portion 3d (4d) that bends the outer end of the well 3c (4c) in the axial direction includes the flange portion 3a (4a), the beat seat portion 3b (
4b) - After the well part 3c (4C) is molded, it may be pressed against the right end surface of the well molded part 11c of the mold 11 by the roller 12a and drawn and molded, or it may be drawn and molded by press working or the like in a separate process. You can do it like this.

Next, as shown in FIG. 3, bolt holes 3e (4e) are punched out at the peripheral edge of the connecting portion 3d (4d) using a press.

Next, as shown in FIG. 4, the inner rim 3 and the outer rim 4 are coaxially placed back to back at the outer ends of the well portions 3c and 4C, that is, the connecting portions 3d (4d), and the bolts 5 are inserted.
The rim B is integrally fixed to form the rim B.

In this case, in this example, the disk 6 is superimposed on the connecting portion 3d of the inner rim 3 and collinearly aligned with the bolt 5, thereby forming the disk wheel A at the same time.

(Effects of the Invention) As is clear from the above description, the present invention is capable of molding an inner rim and an outer rim that face each other by deforming a pair of pipe materials in the axial direction. Later on, there will be no wall extending towards the axis, and the step of stamping it out will no longer be necessary.

In addition, since the molding material used to mold each rim is pipe material,
Compared to conventional disc materials, less material is wasted in obtaining the molding material.

Therefore, the present invention has the advantage that the rim can be formed quickly and with a good yield.

[Brief explanation of drawings]

1 to 4 are process diagrams of a method for forming a split rim according to an embodiment of the present invention, FIG. 1 is a perspective view of a pipe material, and FIG. 2 is a cross-sectional view of a main part showing its drawing state. Figures 3 and 3 are sectional views of main parts showing the state of punching out the bolt holes of the connecting portion, and Fig. 4 is a sectional view showing the state of assembly of the split arm. 1 and 2: Pipe material, 3: Inner rim, 4: Outer rim,
3a/4a: flange part, 3b/4b=bead seat part, 3C/4C: well part, 3d-4d: connecting part, 3e/
4e: bolt hole, 10: main shaft, 11: mold, 11a: flange molding section, 11b: bead sheet molding section, 11C: well molding section, 12/12a: roller (spatula). Application agent Hisada Matsumoto 1 Figure 2 Figure 2 (4a) (4b)

Claims (1)

[Claims] 1. A pair of pipe materials formed to a predetermined length is provided, and each pipe material is deformed in the axial direction to form a pair of inner rims and outer rims that face each other in the axial direction, and then A method for molding a split rim, characterized in that the opposing end portions of each inner rim and outer rim are bent in the axial direction, and then the inner rim and outer rim are coaxially and integrally connected at the bent portions. .