JP2003088928A - Manufacturing method of car wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a car wheel which can improve the strength and the torsional accuracy of the wheel and simplify manufacturing steps by integrating a rim part with a disk part. SOLUTION: The manufacturing method of the car wheel comprises a step 1) of forming a bottomed cylindrical body 12 from a plate 10, a step 2) of performing the reverse drawing of the bottomed cylindrical body 12 from the direction of the bottom part, and forming a bottom flange part 16a to form a bottom flange cylindrical body 16, a step 3) of expanding the bottom flange part 16a outwardly in the radial direction to form a flange stock body 19 having a disk side flange part 19a, a step 4) of forming a disk side rim stock part 26a of the flange stock body 19, a step 5) of forming a rim opening side rim stock 26b of the flange stock body 19, and a step 6) of forming a rim flange part 38 on an end part of the disk side rim stock part 26a and an end part of the rim opening side rim stock part 26b.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing an automobile wheel.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional vehicle wheel comprises a rim 1 and a disc portion 2 which are manufactured separately as a basic shape. The rim portion 1 has a disc side flange portion 1a and an opening. The side flange portion 1b, the bead seat portion 1c, the side wall portion 1d, and the drop portion 1e are formed, and the outer peripheral portion of the disc 2 is fitted to the inner periphery of the drop portion 1e of the rim, and both are formed in the x portion. Are welded together and integrated.

[0003]

However, the conventional method has the following problems. (1) In the rim portion 1, as shown in the rim forming process diagram of FIG. 5, the coil material is rolled and both ends thereof are welded to form a cylinder, so air leakage may occur from the welded portion. . (2) Since the number of molding steps of the rim portion 1 is as large as 13 as shown in FIG. 5, productivity is poor. (3) The reliability of the strength of the welded joint between the rim portion 1 and the disc portion 2 is low. (4) The runout accuracy of the wheel decreases due to the thermal distortion of the welded portion. The object of the present invention is to form a plate, eliminate the welding process, and integrally mold the rim portion and the disc portion,
An object of the present invention is to provide a method for manufacturing an automobile wheel, which is capable of improving the strength of the wheel, the accuracy of runout, and reducing the manufacturing cost by simplifying the process.

[0004]

Means for Solving the Problems The present invention for achieving the above object is as follows. (1) A method for manufacturing an automobile wheel including sequentially performing the following steps, a step of forming a bottomed cylindrical body from a plate material, reverse drawing is performed from a bottom direction of the bottomed cylindrical body, and a bottom flange portion is formed on the bottom. A step of forming a bottom flange cylinder, a step of forming a bottom flange portion of the bottom flange cylinder by expanding the bottom flange portion outward in the radial direction, and forming a flange element body having a disc side flange portion, the flange A step of forming a disc-side rim element portion of the template, a step of forming a rim opening-side rim element portion of the flange element, an end of the disk-side rim element portion, and the rim opening-side rim element The process of forming the rim flange on the end of the shape. (2) The method of manufacturing an automobile wheel according to (1), wherein the step of forming the flange element body by the above-mentioned expansion molding includes a plurality of steps. (3) The above steps are performed by press molding,
(1) or the manufacturing method of the wheel for vehicles of (2) description. (4) The method for producing an automobile wheel according to (1) or (2), wherein the above steps are performed by roll forming or spinning molding.

In the above-mentioned method (1) for manufacturing an automobile wheel, the rim portion and the disc portion can be integrally formed, and the welding process of the rim portion and the disc portion is not required, so that the strength of the wheel is improved and the runout accuracy is improved. The manufacturing cost can be reduced by improving and simplifying the process. In the method of manufacturing an automobile wheel of the above (2), since the mouth widening step is performed in plural steps, the molding can be performed without difficulty. In the method of manufacturing an automobile wheel described in (3) above, the rim flange portion is formed by press forming, which is efficient. In the automobile wheel manufacturing method of (4) above, the rim flange portion is formed by roll forming or spinning forming, so that even a complicated shape can be formed. Further, in the spinning forming, the shape of the rim portion, the plate thickness and the like can be controlled more accurately than in the press forming and roll forming.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows steps of a method for manufacturing an automobile wheel according to an embodiment of the present invention. First, in the step (A), a flat plate material 10 is prepared. The plate material 10 is preferably circular so that the end can be finished neatly when the bottomed cylindrical body is formed in the next step, but it may be quadrilateral depending on the case. Next, in the step (B), the plate material 10 is drawn between the male die 12 and the female die 13 to form the bottomed cylindrical body 11. Next, in the step (C), the bottomed cylindrical body 11 is made into a cylindrical shape 14 and reverse drawing dies 14 and 15 made of a cylindrical piece 15 with the bottom of the bottomed cylindrical body 11 facing upward. Is inserted into the mold 15 and is reverse-throttled from the bottom side of the bottomed cylindrical body 11 toward the opening end, and the bottom flange of the bottom outer periphery protrudes toward the side opposite to the opening end with respect to the center of the bottom. The portion 16a is molded to mold the bottom flange cylindrical body 16. Further, in the step (D), the bottom flange portion 16a of the bottom flange molded body 16 is moved to the first expanding die 1
7 and 18, the bottom flange portion 16a is radially outwardly expanded to form a flange element body 19 having a disk-side flange portion 19a. Bottom flange portion 16a in the step of expanding the bottom flange portion 16a of the flange assembly 19
The angle of the mouth widening is to be tilted outwardly in the radial direction by about 60 degrees in accordance with the shape of the rim flange. In addition,
The expansion molding step may be performed at 10 degrees or 40 degrees depending on the shape and material of the product, as shown in (D) to (F).
The process may be performed in two or three steps such as 60 degrees. In the step (E), the second mouth opening molds 20, 21 are used, and in the step (F), the second mouth opening molds 22, 21,
23, the mouth is expanded. Next, in the step (G), the disc-side rim element shape portion 26a is formed by the rim portion forming dies 24 and 25. Next, in the step (H), the rim opening-side rim element 2 is formed by the rim forming dies 29 and 30.
Mold 6b. Next, the disk portion 35 is molded by the disk molds 33 and 34. Through the above steps, the intermediate product 28 of the automobile wheel shown in FIG. 2 is formed by molding up to the so-called bead seat portion of the automobile wheel according to the present invention. Next, curls are formed at the ends of the disc-side rim element portion 26a and the rim opening-side rim element portion 26b of the intermediate product 28 to form the rim flange portions 38 shown in FIG. 3, respectively. . By this step, the automobile wheel 36 according to the embodiment of the present invention is completed.
The rim flange portion may be molded by the upper and lower molds of the press, or by any of roll forming molding and spinning molding. Press molding is the simplest and most efficient, but it may be difficult to process depending on the shape of the entire wheel. Roll forming and spinning can be used even for complicated shapes. Further, in the spinning forming, the shape of the rim portion, the plate thickness and the like can be controlled more accurately than in the press forming and roll forming.

[0007]

According to the method of manufacturing an automobile wheel of the first aspect, the rim portion and the disc portion can be integrally formed, and the welding process of the rim portion and the disc portion is unnecessary, so that the strength of the wheel is improved. The shake accuracy can be improved, and the manufacturing cost can be reduced by simplifying the process. According to the method of manufacturing an automobile wheel of the second aspect, since the mouth widening step is performed in a plurality of steps, the molding can be performed without difficulty. According to the vehicle wheel manufacturing method of the third aspect, the rim flange portion is formed by press forming, so that the rim flange portion can be formed efficiently. According to the vehicle wheel manufacturing method of the fourth aspect, since the rim flange portion is formed by roll forming or spinning forming, it is possible to form even a complicated shape. Further, in the spinning forming, the shape of the rim portion, the plate thickness and the like can be controlled more accurately than in the press forming and roll forming.

[Brief description of drawings]

FIG. 1 is a process drawing showing a process of a method for manufacturing an automobile wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view of an intermediate product of an automobile wheel molded according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a finished automobile wheel manufactured according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the shape of a conventional automobile wheel.

FIG. 5 is a process chart showing a conventional method for manufacturing an automobile wheel.

[Explanation of symbols]

10 plate materials 11 Bottomed cylindrical body 16 Bottom flange cylinder 16a Bottom flange part 19 Flange form 19a Disc side flange 26a Disc-side rim element 26b Rim opening side rim element 38 Rim flange

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60B 3/02 B60B 3/02

Claims (4)

[Claims] 1. A method for manufacturing an automobile wheel, which comprises sequentially performing the following steps: forming a bottomed cylinder from a plate material; performing reverse drawing from the bottom of the bottomed cylinder to form a bottom flange on the bottom. Forming a bottom flange cylindrical body, a step of forming a bottom flange cylindrical body of the bottom flange cylindrical body outwardly in a radial direction, and a step of forming a flange element body having a disc side flange portion, A step of forming a disc-side rim element portion of the flange element, a step of forming a rim opening-side rim element portion of the flange element, an end of the disk-side rim element portion, and a rim opening-side rim element Of forming the rim flange on the end of the part. 2. The method of manufacturing an automobile wheel according to claim 1, wherein the step of forming the flange element body by the expansion molding includes a plurality of steps. 3. The method for manufacturing an automobile wheel according to claim 1, wherein the step is performed by press molding. 4. The method according to claim 1, wherein the step is performed by roll forming or spinning forming.
A method for manufacturing the vehicle wheel described above.