JPH01258867A - Joining method for end part of annular rim stock - Google Patents

Abstract

PURPOSE:To improve the durability of a rim without incurring the deterioration of the external appearance by welding a link piece and rim stock after fitting the respective corresponding end part of the link piece by forming a link piece insertion hole on the opposed end faces of an annular rim stock. CONSTITUTION:A rim stock 1 is bent in an annular rim shape after its extruding in the necessary sectional shape having the link piece fit-in holes 1a, 1b in an oblong rectangular sectional shape on the end face. One end part 2a of the strip plate like link piece 2 having projecting edges 3, 3 at both side parts in the width direction is fitted into the link piece fitting hole 1a of one end face thereof and the other end part 2b of the link piece 2 is fitted into the link piece fitting hole 1b of the other end face. Thereafter, the link piece 2 and rim stock 1 are integrated by joining by plug welding over plural places from the outer peripheral face side, the build-up place of a welding part 4 is removed by cutting and the like piece 2 and rim stock 1 are welded in the state of the weld zone being not exposed at the inner peripheral face side of the annular rim stock 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method for joining ends of annular rim materials used as rims for bicycles and motorcycles.

Conventional technology Conventionally, as a method for joining the ends of this type of annular rim material, there have been two methods: butting the ends and joining them together by flash pad welding, or forming holes on the opposing end faces of the ends. A method of connecting and fixing by forming a hole and press-fitting a connecting bottle into the hole has been adopted.

Problem to be Solved by the Invention However, when using flash pad welding, so-called burr is formed around the entire circumference of the joint including the inner peripheral surface side that is visible when used as a rim. Puff polishing is required, and the finishing process is troublesome.

On the other hand, when fixing using a bottle, the bottle must be press-fitted into the hole in order to maintain sufficient connection strength, but this process is not only difficult, but also difficult to use. The problem was that it was easy for the inside to rattle.

In view of the above-mentioned problems, this invention makes it possible to perform the joining work easily, and also provides a good external appearance without causing any cracks on the inner circumferential surface that appears when used as a rim. To provide a method for joining an end portion of an annular rim material, which can achieve a strong joining strength that does not cause rattling during use.

As a means for solving the problem, the method for joining the ends of an annular rim material according to the present invention includes, when joining both ends of an annularly curved rim material, a connecting piece is inserted into the opposite end surface of the rim material. After forming a hole and fitting each corresponding end of the connecting piece into the holes at both bottoms, the connecting piece and the rim material are welded together in such a manner that the welded portion is not exposed on the inner peripheral surface side of the annular rim material. By doing so, they can be joined and integrated.

The alloy of the rim material used in this invention is not particularly limited, but for example, Aρ-Mg-3L, A
Aluminum alloys such as fi-Zn-Mg series, especially A
Q-Zn-Mg alloys are advantageous in that they can improve strength and reduce weight, so they can be suitably employed.

In terms of manufacturing cost and quality, the rim material is preferably manufactured by homogenizing the aluminum alloy ingot and extruding it into the cross-sectional shape of the rim.

Then, the rim material is bent into an annular shape, and both ends of the rim material are joined together. In this invention, when joining the rim material, a connecting piece insertion hole is formed on the opposite end surface of the annular rim material, and the two ends are joined together. Each corresponding end of the connecting piece shall be inserted into the insertion hole. It is preferable to form this connection piece insertion hole at the same time as extrusion molding the rim material because it is easier to process. It may be formed by cutting or the like over the entire length. Further, the shape may be a horizontally elongated rectangular cross section, or may be a circular cross section. In the latter case, it is preferable to provide a plurality of them.

Next, one end of the connecting piece is fitted into the connecting piece fitting hole on the one end side of the rim material, and the other end of the connecting piece is fitted into the connecting piece fitting hole at the corresponding position on the other side. Temporary bonding shall be performed by.

The above-mentioned connecting piece is not intended to achieve a complete connected state between the ends of the rim material only by fitting it into the connecting piece insertion hole, but if there is extreme play, it may be necessary to do so later. This may cause support for the welding work,
Moreover, if the press-fitting condition is too extreme in an attempt to obtain strong connection strength, the fitting operation becomes difficult, resulting in deterioration of workability. Therefore, the connecting piece can maintain a certain degree of temporary connection between the ends of the rim material with respect to the connecting piece insertion hole of the rim material, and the connection piece can maintain a certain degree of temporary connection between the ends of the rim material, and the connecting piece can maintain a certain degree of temporary connection between the ends of the rim material, and the connection piece can maintain a certain degree of temporary connection between the ends of the rim material, and the connection piece can be connected to the connecting piece insertion hole of the rim material. The size and shape are desirable.

After the fitting state is established, the connecting piece and the rim material are welded together in such a manner that the welded portion is not exposed on the inner peripheral surface side of the annular rim material. This is to avoid deterioration in appearance due to the welded portion being exposed on the inner circumferential surface side, as well as to make it possible to omit the accompanying surface treatment work. Specifically, the annular rim material may be attached to the tire by shear welding or spot welding from the surface side, that is, from the outer peripheral surface side. When shear welding is performed from the outer peripheral side,
The welded part will be exposed on the outer circumferential side, but since the tire is fitted to this outer circumferential side, the welded part will not be visible in the fitted state and will not cause deterioration of the external appearance. . However, even in this case, it is preferable that the raised portion due to welding be appropriately cut off using a grinder or the like. As a result, the appearance can be improved, and the strength can be improved compared to the conventional method of simply pinning.

Example The present invention will be explained in detail below.

1 to 3 show an embodiment of the present invention, in which an AQ-Zn-Mg alloy ingot is homogenized as the rim material (1), and a cross-section is formed on the end face as shown in FIG. The material used was one extruded into a desired cross-sectional shape having horizontally long rectangular connecting piece insertion holes (la) and (lb). After tempering this into an O material, it was bent into the shape of an annular rim. As shown in FIG. 1, one end of a strip-shaped connecting piece (2) having protruding edges (3) (3) on both sides in the width direction is inserted into the connecting piece insertion hole (la) on one end surface. (2a), and insert the other end (2a) of the auxiliary piece (2) into the connecting piece fitting hole (1b) on the other end surface.
2b) was inserted.

Thereafter, the connecting piece (2) and the rim material (1) are joined together by welding over several points from the outer peripheral surface of the annular rim material, as shown in FIGS. 2 and 3. It became. Thereafter, the raised portion of the welded portion (4) was removed using a grinder.

4 to 6 show another embodiment of the present invention, in which a rim material (10) similar to that of the above embodiment is used, but a connecting piece fitting hole (10a) at the end is used. (jo
As b), a small bottomed hole with a circular cross section is formed using a drill, and each end (20a) of the cylindrical connecting piece (20) (20) is inserted into the connecting piece insertion hole (loa) (10b).
) (20b), and the two were spot welded to be integrated. In the figure, (40) indicates a welded part.

It was confirmed that the rims obtained by any of the above methods not only had a good appearance but also had a sufficiently strong joint strength.

Effects of the Invention As described above, when joining opposing ends of an annularly curved rim material, connecting piece fitting holes are formed on the opposing end surfaces of the rim material, and connections are made to these fitting holes. After each corresponding end of the piece is fitted, the connecting piece and the rim material are welded together in such a manner that the welded portion is not exposed on the inner peripheral surface side of the annular rim material. Therefore, as in the case of flash pad welding in which opposing end surfaces are welded and fixed together, so-called cracks are not formed around the entire circumference of the joint including the inner circumferential surface side that is visible when used as a rim. Therefore, there is no need for deterioration of the external appearance, and finishing work such as buffing over the entire circumference to remove the above-mentioned flakes can be eliminated. In addition, it not only eliminates the troublesome work of press-fitting the bottle into the connecting piece fitting hole in order to maintain sufficient connection strength, as in the case of fixing using only the bottle, but also the rim material and Since the connecting pieces are integrally welded together, there is no wobbling over time, and the durability of the rim is improved.
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[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the vicinity of the joint showing the connecting piece in the process of being inserted, and FIG. 2 is a partially cutaway perspective view of the vicinity of the joint showing the joined state. 3 is a sectional view taken along the line ■-■ in FIG. 2, FIGS. 4 to 6 show other embodiments, and FIG. 5 is a partially cutaway perspective view of the vicinity of the joint corresponding to FIG. 2, and FIG. 6 is a cross-sectional view taken along line VI--■ in FIG. (1) (10) ... Rim material, (la) (lb)
(10a) (10b)...Connecting piece insertion hole, (2)(
20) , , Connection piece, (2a) (2b) (20a
) (20b)... end. that's all

Claims (1)

[Claims] When joining the opposing ends of the annularly curved rim members (1) (10), connecting piece fitting holes (1a) (1b) (10a) are formed on the opposing end surfaces of the rim members (1) (10). ) (10b
), and these insertion holes (1a) (1b) (10a)
(10b) and each corresponding end (2a) of the connecting piece (2) (20).
) (2b) (20a) (20b), the connecting pieces (2) (20) and the rim material are fitted in such a manner that the welded part is not exposed on the inner peripheral surface side of the annular rim material (1) (10). (1)
(10) A method for joining an end of an annular rim material, characterized by joining and integrating the two by welding.