JPH0741762B2 - Manufacturing method of automobile wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use and Outline of the Invention] The present invention relates to a method for manufacturing an automobile wheel, in particular, a so-called two-piece type of a type in which a rim and a disk separately formed are integrated by welding. Of aluminum wheels.

[Prior Art and its Problems] A so-called welded two-piece type aluminum wheel which adopts a method of forming a rim by plastically working a plate-shaped material and integrating a disc with the rim is shown in FIG. As shown in FIG. 3, the periphery of the disk (2) having a hub mounting opening formed in the center is welded to the abdomen (11) of the rim (1) for manufacturing.

Then, in order to rationalize this welding work, the peripheral edge of the disc (2) is raised in the axial direction to form a flange portion (21), and the tip of the flange portion (21) and the belly portion (11).
Are welded together to integrate the rim (1) and the disc (2). With this manufacturing method, since the weld bead (32) of the weld is set to be located on the inner surface side of the wheel, the weld bead (32) appears in the appearance in this conventional wheel. There is an advantage that there is nothing.
Further, there is an advantage that it can be manufactured at a lower cost than the one integrally molded as a whole.

However, in this conventional one, the smoothness of the appearance is insufficient as compared with the one in which the rim (1) and the disc (2) are integrally molded. In addition, the flange part (2
There is a gap between the base end of 1) and the rim (1),
If used for a long time, pebbles and dust easily enter this gap. Furthermore, if rainwater or the like accumulates, it causes rust.

In particular, when the disk (2) is a plastically processed product made of a plate-shaped material, there is an arcuate portion at the base end of the flange portion (21) located at the outer peripheral edge of the flange portion (21). A large gap corresponding to the arcuate portion is formed in the joint portion between the base end portion and the rim (1), and the above tendency becomes remarkable.

[Problem] According to the present invention, the peripheral edge of a disc (2) is welded to the inner peripheral surface of a rim (1) made of a plastically-formed product of a plate-shaped material made of aluminum or its alloy. In the method of manufacturing a vehicle wheel ", it is an object to prevent pebbles and dust from entering the welded portion of the rim (1) and the disc (2) and to collect rainwater.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is "in the welding process of the rim (1) and the disc (2), the inner edge and the outer side of the peripheral edge of the disc (2)" Both edges are welded over the entire circumference to the inner peripheral surface of the rim (1), and the wall thickness in the range from the outer peripheral end of the outer rim flange (1a) located on the wheel outer surface side to the welded part of the disc (2) Is set to a thickness having a finishing cutting allowance, and after the welding, the cross-sectional shape of the inner peripheral side of the disc portion including the welded portion of the outer end edge to the outer end edge of the outer rim flange (1a) changes suddenly. The outer surface side of the wheel up to the portion is finish-cut to remove the weld bead portion (31) of the welded portion and to finish the outer surface side of the wheel into a smoothly continuous cross-sectional shape. "

[Operation] The above technical means of the present invention operates as follows.

The whole is made of aluminum or its alloy, and the inner and outer welds of the disc (2) are also made of the same material, but it occurs between the peripheral edge of the disc (2) and the inner peripheral surface of the rim (1). The gap portion is surely filled with the welded portion.

Therefore, at the end of this welding process, the outer surface of the wheel
The welding bead is in a state of protruding in the gap portion generated in the conventional method.

In the next step, the weld bead is not only partially removed by cutting, but also from the outer peripheral end of the outer rim flange (1a) located on the wheel outer surface side of the rim (1) to the central area of the disc (2). At the same time, the cross-section changing portion is finish-cut at the same time, and the outer surface of the wheel is cut into the final finish cross-sectional shape.
That is, the outer surface of the wheel is finished to have a smooth cross section composed of a predesigned curved line or straight line, and has an appearance similar to that of an integrally cast wheel.

In addition, since the range from the outer rim flange (1a) corresponding to the finish cutting portion of the rim (1) to the welded portion with the disc (2) is set to a thickness having a finish cutting margin,
Even if many parts are cut and removed by the finishing process, the thickness of the part outside the disc (2) of the rim cross section becomes sufficient. Further, the outer weld bead is removed, but the remaining welded part in this part and the welded part on the inner side surface of the disc remain in the same state. Therefore, the welding strength between the rim (1) and the disc (2) is Are secured by these welds.

[Effects] The present invention having the above-described configuration has the following unique effects.

The outer surface of the wheel is finished in a smooth cross-sectional shape consisting of a combination of predesigned straight lines or curved lines, so that the same smoothness of appearance as that obtained by integrally molding the rim (1) and the disc (2) is obtained. be able to.

In particular, since the area from the outer peripheral edge of the outer rim flange (1a) of the rim (1) to the sudden change in cross section of the center of the disc (2) is finish-cut, the overall appearance of the wheel is
It is possible to eliminate the discontinuous image of the appearance, such as the case of partially finishing cutting such as deburring.

In addition, since no gap is created at the joint of the outer edge of the disc (2), even if it is used for a long period of time, pebbles and dust will not enter the gap, and rust due to intrusion of rainwater etc. will be prevented. it can.

Since the welding strength between the rim (1) and the disc (2) can be secured by the residual welding portion on the outer surface side and the welding portion on the inner surface side,
The wheel strength is sufficient.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the method of the first embodiment shown in FIG. 1, as the rim (1), a tubular body made of aluminum or aluminum alloy is formed into a predetermined cross-sectional shape by rolling or pressing, as in the conventional one. A disk (2) that is formed by molding and is formed by casting or forging
Is welded so as to be continuous with the edge of the rim (1) on the wheel outer surface side.

As shown in the figure, the disc (2) has an inclined surface portion (23) continuous with the outer rim flange (1a) on the outer peripheral side of the hub mounting portion (22) at the center of the disc (2). And the hub mounting portion (22) is provided with the inclined surface portion (2
It is a section where the cross-section changes suddenly to the inside of 3).

When the disc (2) and the rim (1) are welded, the disc (2) is arranged so that the inner peripheral edge of the outer rim flange (1a) of the rim (1) and the outer peripheral edge of the disc (2) are aligned. Weld both side edges of the periphery of the whole circumference. Therefore,
Weld beads (31), (3
2) occurs, but in the finishing step after welding, the welding bead (31) located on the outer surface side of the wheel is removed by finish cutting.

In this finishing cutting step, the entire surface of the inclined surface portion (23) and the entire outer surface of the outer rim flange (1a) are cut into a predetermined sectional shape. Thereby, the welding bead (31)
Not only is the part cut off smoothly, but the finished surface reaches almost the entire outer surface of the wheel, and as shown by the phantom line in the figure, the appearance is exactly the same as the conventional cast molding. It is possible to finish.

Incidentally, as shown in the figure, the wall thickness in the range from the outer peripheral edge of the outer rim flange (1a) to the welded portion with the disc (2) in the rim (1) takes the above-mentioned finishing cutting allowance into consideration. It goes without saying that the meat pressure is set. The same applies to the finish cutting portion of the disc (2).

In the second embodiment shown in FIG. 2, the welding position of the disc (2) is set at a position deviated inward from the outer rim flange (13) of the rim (1).
In the disk (2), the peripheral edge of the inclined surface portion (23) is welded to the inner surface of the rim (1) from inside and outside.

Also in this case, the outer surface in the range from the outer peripheral end of the outer rim flange (1a) to the hub mounting portion on the inner peripheral side is finished by finish cutting after welding, and as shown by the imaginary line in the figure,
Similar to the first embodiment, the external appearance has a sense of unity.

[Brief description of drawings]

FIG. 1 is an explanatory view of the welding process of the first embodiment of the method of the present invention,
FIG. 2 is an explanatory view of the second embodiment, and FIG. 3 is an explanatory view of a conventional example. In the drawing, (1) ... rim, (2) ... disk (31), (32) ... welding. bead

Claims (1)

[Claims] 1. A method for manufacturing an automobile wheel, in which a peripheral edge of a disk (2) is welded to an inner peripheral surface of a rim (1) made of a plastically worked product of a plate-shaped material made of aluminum or its alloy. In the welding process of the rim (1) and the disc (2), the inner peripheral edge and the outer peripheral edge of the disc (2) are welded to the inner peripheral surface of the rim (1) over the entire circumference, Outer rim flange (1
The wall thickness in the range from the outer peripheral end of a) to the welded portion of the disc (2) is set to a thickness having a finishing cutting allowance, and after the welding, from the outer peripheral end of the outer rim flange (1a). The outer surface side of the wheel including the welded portion of the outer edge and the inner peripheral side of the disk (2) up to the sudden change portion is cut off to remove the weld bead portion of the welded portion and the outer surface of the wheel cross section. A method for manufacturing an automobile wheel in which a side is smoothly finished into a continuous cross-sectional shape.