JPS61172636A - Production of wheel for automobile - Google Patents

Abstract

PURPOSE:To prevent the generation of cracks due to fatigue and to eliminate the deformation of wheel by making a rim and disc in an integral construction using a piece of blank. CONSTITUTION:The bowl shaped member 9 having a flange 8 on the peripheral edge part is formed by forming with bulging the center part of a circular plate shaped blank 7 by a press work. The bulging part having the smaller diameter d than the diameter D of the bulging part is then formed by forming with bulging by a press work the bottom part of the bowl shaped member 9, namely from the opposite direction to the bulging direction. The outer peripheral edge part 10 is formed in cylindrical shape by rising with a press work the flange 8 provided on the outer peripheral edge part further. The outer peripheral part 10 is then formed in recessed curved face shape by a roll work. A forming work is then performed further so as to make the outer peripheral part in the prescribed rim shape with further roll work and the wheel 13 for automobile of an integral construction having a rim part 11 and disc part 12 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method of manufacturing an automobile wheel having an integral structure of a rim and a disc.

BACKGROUND OF THE INVENTION Conventionally, wheels used for automobiles are made by separately manufacturing a rim (1) and a disc (!1) and welding them together to form a wheel (4), as shown in Figure 8 (-OK). .

Problems to be Solved by the Invention However, in the wheel (41) obtained as described above, as shown in FIG.
Fatigue cracks T@l are more likely to occur than 1, and these fatigue cracks (-) can cause air leaks in Tishima-pressed tires, or in the worst case, the rim 111 and disc (phantom) may come off, causing a major accident. There was a danger of being connected.

For this reason, in wheel (4) OJEI construction, the welded part (
3) Inspecting the shear strength and installing a monitor on the welding machine requires constant monitoring of the welding status, which has the drawback of requiring labor and cost.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks, and provides a method for manufacturing an automobile wheel in which a rim and a disc are integrally constructed using a single sheet of plank material. It is something.

There is a process in which the central part of a disk-shaped plank material is stretched out to form a dish-shaped member having a brim on the outer peripheral edge, and a process in which the dish-shaped member is further extended from the opposite direction to the direction in which it is extended, and the overhang part is further extended. a second step of forming an overhanging portion with a diameter smaller than the diameter; a third step of making the outer peripheral edge rise as if stretching; From the fourth step of processing, the first to third steps are performed by press working, and the fourth step is performed by roll processing. Therefore, the rim and disk are integrally formed, and cracks on one side of the rim are removed. An automobile wheel having a double structure is formed.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

1st! ! As shown in 11(a), the central part of a disk-shaped plank material (1) is formed by press working to stretch it, and as shown in the same figure (b), a plate having a collar (8) on the outer periphery is formed. form a shaped member (II).

Next, as shown in FIG. form a section.

Furthermore, as shown in FIG.

Then, the outer circumferential portion, which stands up in a cylindrical shape as described above, is formed into a concave curved surface by roll processing, as shown in FIG.

Next, the outer periphery is molded into a predetermined rim shape as shown in the same figure (f), and an integrally constructed automobile having a rim part (river and disc part) is manufactured. A wheel a field is formed.

As shown in Fig. 2 (a), the roll forming is carried out by holding and fixing the pressed workpiece with a bottom roller 94°A4, and rotating both of them while lowering the top roller (1 o'clock) to finish the work into the desired shape. The workpiece finished into the desired shape as described above is shaped by the bottom roller 611 and the top roller having a final zero rim shape to form an automobile wheel.

Note that the above-mentioned press working process and roll working process can also be increased in consideration of the degree of working.

Effects of the Invention Since the present invention has the above configuration, unlike a wheel in which the rim and disc are integrated by welding, it is possible to obtain a wheel with an integral structure without any welded parts, so that cracks due to fatigue are completely eliminated. Since there are no cracks in the rim, there are no accidents such as air leaks or discs coming off the rim.

Furthermore, the 7-tuned part on one side of the rim has a double structure, so it has appropriate elasticity and impact strength, and has the advantage of not causing deformation of the wheel even if the car runs over a step or bump. It has the following effects.

[Brief explanation of the drawing]

FIGS. 1(A) to 1(F) are cross-sectional views of semi-finished products in each process showing the main work order of wheel manufacturing according to the present invention, respectively;
Figures 3(u) and (b) are sectional views of essential parts showing the state of roll forming, respectively. Figure 3(a) is a partially cutaway sectional view of a conventional automobile wheel. It is an enlarged cross-sectional view showing the main part of the welding part. nl t H... Rim Ill, Ill...
・Disk (3)...Welded part +41, Q
l...Wheel (6)...End Garden...Crack (1)...Plank wood (8)...Boxwood (9)
)...Dish-shaped member (to)...Outer circumference α4. −・
・・Bottom ruler α1.0η・・Donozuro 2 1st mouth (I J

Claims (1)

[Claims] A method for manufacturing an automobile wheel having an integral structure of a rim and a disc using a single plank material, comprising the steps of: (a) extending the center of a disk-shaped plank material; , a step of projecting from the opposite direction to the above-mentioned projecting direction with a diameter smaller than the diameter of the projecting portion, c. a step of raising the outer periphery so as to stretch it, and d. a step of processing the raised outer periphery into a rim shape. The above steps A, B, and C are performed by press working, and D.
A method for manufacturing an automobile wheel, characterized in that the step of step (1) is carried out by roll processing.