JPH07112581B2 - Manufacturing method of automobile wheel - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a road wheel supporting a tire of an automobile.

2. Description of the Related Art Generally, as shown in FIG. 3, a road wheel 3 for supporting a tire 1 of an automobile includes a rim portion 3a to which the tire 1 is fitted and fixed, and a disc portion 3b for fixing the road wheel 3 to a hub 5. It consists of and.

Usually, as the road wheel 3, there is known a two-piece type structure in which a rim portion 3a and a disc portion 3b are separately manufactured in advance as shown in FIG. 4 and both are integrally welded at a welding portion 7. ing.

Generally, the rim portion 3a is subjected to roll processing, spinning processing or cutting processing after molding, and the disk portion 3b is manufactured by a mechanical processing means such as press working or casting of sheet metal.

FIG. 5 shows a one-piece type road wheel 3 as another conventional example, in which the rim portion 3a and the disc portion 3b are integrally manufactured in advance by means such as casting, and thereafter, especially the rim portion 3a. The precision is improved by applying cutting or spinning means to the.

FIG. 6 shows a three-piece type road wheel 3 as another conventional example. In this example, the inner rim portion 3 is used.
c, an outer rim portion 3d and a disc portion 3b, and the inner rim portion 3c and the outer rim portion 3d are welded to each other to enhance airtightness.
3c, the outer rim portion 3d, and the disc portion 3b are fastened and fixed with bolts 9.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional road wheel manufacturing method, particularly in the case of the two-piece type shown in FIG. 4, the rim portion 3a and the disc portion 3b are separately prepared and then welded. Since it has to be, it is difficult to obtain a high alignment accuracy due to the influence of thermal strain when welding both together, and the process is complicated and costly. was there.

Further, in the case of the one-piece type manufacturing shown in FIG. 5, the rim portion 3a and the disc portion 3b are integrally manufactured by using a means such as cutting or casting, so that the manufacturing process is complicated. In addition to the drawback that the cost becomes high, when the casting means is used, the casting material has tensile strength, elongation,
There is a problem that it is not always satisfactory from the viewpoint of impact resistance.

Further, in the case of the three-piece type shown in FIG. 6, since the road wheel 3 is composed of three parts, the number of molds at the time of molding is further increased, and in the same manner as the example shown in FIG. It is difficult to obtain high alignment accuracy due to the influence of thermal strain when welding these three parts together, and in particular, in order to improve airtightness, the inner rim portion 3c and the outer rim portion 3d must be welded. However, there is a drawback that the number of processes is increased.

Furthermore, in each of the above examples, the components are made of steel,
There is a problem that the weight increases as a whole.

Therefore, the present invention solves the problem of having such a conventional vehicle road wheel, simplifies the production and lowers the cost, and in terms of tensile strength, elongation, and impact resistance. Another object of the present invention is to provide a method for manufacturing an automobile wheel, which is excellent and can reduce the overall weight.

Means for Solving the Problems In order to achieve the above object, the present invention firstly contemplates, by claim 1, concentrically joining a rolled material for an inner rim and a rolled material for an outer rim, which are annular bodies, and A step of welding concentrically a portion separated from the peripheral edge of the rolled material by a concentric shape to form an annular welded portion, and an annular protrusion on an appropriate portion of both rolled materials located inside the welded portion. Forming a disk portion on the protrusion and its vicinity, forming a bolt mounting hole at an appropriate position on the disk portion, and rolling for an inner rim located outside the annular welded portion. Wheel for an automobile having at least a step of forming a rim portion by opening left and right materials and a rolled material for outer rim to the left and right, and a step of opening a valve mounting hole for injecting air into a tire at one end portion of the rim portion The manufacturing method of It

According to a second aspect of the present invention, a center hole having a large inner diameter reaching from the central portion of the rolled material for the inner rim formed of the annular body to the concentric welded portion is opened. Further, according to claim 3, a light alloy is used as a material for the rolled material for the inner rim and the rolled material for the outer rim.

According to such a wheel manufacturing method, first, the rolled material for the inner rim and the rolled material for the outer rim, which are annular bodies, are concentrically joined to each other, and then the portions separated from each other by a predetermined length from the peripheral portions of both the rolled materials are concentrically formed. By forming an annular welded portion by welding, by forming an annular protrusion at an appropriate portion of both rolled materials located inside the welded portion, the disc portion in the protrusion and the vicinity thereof Composed.

Next, after opening bolt mounting holes at appropriate positions of the disk portion, the rolled material for the inner rim and the rolled material for the outer rim, which are located outside the annular welded portion, are opened to the left and right to be formed into a predetermined shape. The rim portion is configured.

Then, a valve mounting hole for injecting air into the tire is opened at one end of the rim portion to manufacture an automobile wheel.

Therefore, according to the present invention, the press process and the spinning process are mainly used instead of the conventional casting process, heat treatment process and cutting process, so that the process required for the production is shortened and the cost can be reduced. .

Further, according to claim 2, since a center hole having a large inner diameter reaching from the central portion of the rolled material for the inner rim formed of the annular body to the concentric welded portion is opened, the rolled materials are joined to form a seam. By forming a welded portion by concentrically welding the parts separated by a predetermined length from the peripheral edge of both rolled materials by welding means or the like, a hollow centered material is obtained by the large center hole opened in the rolled material for the inner rim. Therefore, an effect that the weight is significantly reduced can be obtained.

Further, according to claim 3, since the light alloy is used as the material of the rolled material for the inner rim and the rolled material for the outer rim, the weight is reduced as a whole and the tensile strength, elongation and impact resistance are excellent. You get the wheel.

Examples Hereinafter, various examples of the method for manufacturing an automobile wheel according to the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a first embodiment of the present invention, which is shown in FIG.
11 is a rolled material for inner rim.
Is composed of a ring of light alloy. A center hole 11a is opened at the center of the rolled material 11.

Reference numeral 13 is a rolled material for outer rim made of the same material as described above, and a center hole 13a is opened at the center position of the rolled material 13. In the illustrated example, the diameter of the rolled material 11 for the inner rim is larger than that of the rolled material 13 for the outer rim.

The outer peripheral portions of the rolled materials 11 and 13 and the center holes 11a and 13a are subjected to punching processing by a press machine, blanking processing, or cutting processing means using a laser beam.

When manufacturing the wheel, first, as shown in FIG. 2B, the center holes 11a and 13a of both rolled materials 11 and 13 are joined together and then separated from the peripheral portions of both rolled materials 11 and 13 by a predetermined length. The portions are welded concentrically by seam welding means or the like to form the welded portion 15, and then the welded portion 15 is formed as shown in FIG.
An annular protrusion 15 is formed at an appropriate portion of both rolled materials 11 and 13 located inwardly of the press using a press machine. The protrusion 17 and the portion in the vicinity thereof are portions to be the disk portion, and the protrusion 17 is provided with a spinning process and other auxiliary means in consideration of workability, designability, strength and cost.

Next, as shown in (D) of the figure, the center hole 11a,
Bolt mounting holes 19 and 19 are opened around 13a. As a reinforcing measure, a steel collar may be fitted in the bolt mounting holes 19, 19.

Next, as shown in FIG. 7E, the rolled materials 11 and 13 located outside the annular welded portion 15 are opened to the left and right based on the spinning processing means or the roll processing means to form a tire shape not shown. The rim portion 21 is formed by molding the rim portion 21 together.

Next, as shown in FIG. 4F, a valve mounting hole 23 for injecting air into the tire is opened at one end of the rim portion 21 to complete the wheel manufacturing.

FIG. 2 shows a second embodiment of the present invention, in which the basic means are the same as those in the first embodiment and are indicated by the same reference numerals in the order of steps.

In the second embodiment, the main purpose is to reduce the weight of the wheel itself, and as shown in FIG. 7A, the center hole 11a opened at the center of the rolled material 11 for the inner rim.
The opening is formed so that its inner diameter is larger than that of the first embodiment. Therefore, as shown in FIG.
The size of the center hole 11a reaching from the central portion of the rolled material 11 for inner rim to the concentric welded portion 15 when joined. A center hole 13a is formed at the center of the rolled material 13 for outer rim as in the above example.

After joining the rolled materials 11 and 13 as shown in FIG. 3B, the portions separated from the peripheral portions of the rolled materials 11 and 13 by a predetermined length are concentrically welded by seam welding means or the like. When the welded portion 15 is formed, a hollow material can be obtained by the large center hole 11a opened in the rolled material 11, so that the weight is significantly reduced.

Thereafter, as shown in FIGS. 3C to 3F, the automobile wheel is completed by following the same procedure as in the first embodiment. Since the above steps are almost the same as those in FIG. 1, duplicated description will not be repeated.

Therefore, according to the present invention, using two rolled materials 11 and 13,
After the rolled materials 11 and 13 are concentrically welded, the road wheel can be manufactured by performing press working, spinning work and various drilling works.

Effects of the Invention As described in detail above, according to the method for manufacturing an automobile wheel of the present invention, after concentrically joining the rolled material for the inner rim and the rolled material for the outer rim, which are annular bodies,
To form a circular welding portion by concentrically welding a portion that is separated from the peripheral portion of both rolled materials by a predetermined length, and form a circular protrusion at an appropriate portion of both rolling materials located inside the welding portion. By forming it, it is possible to form a disk portion on the protrusion and its vicinity, and after further forming a bolt mounting hole at an appropriate position on the disk portion, the inner rim located outside the annular welded portion. The rim portion can be formed by opening the rolled material for use in the outer rim and the rolled material for the outer rim to the left and right and forming them into a predetermined shape.

Therefore, according to the present invention, the press process and the spinning process are mainly used instead of the conventional casting process, heat treatment process and cutting process, and the process required for the production can be shortened and the cost can be reduced. Moreover, since the conventional manufacturing equipment can be used as it is, there is an effect that the versatility of the equipment is large.

Furthermore, by using a light alloy as the rolled material, the weight is reduced overall, and it is possible to improve the power performance of the vehicle and reduce the fuel consumption. In particular, the light alloy has a higher tensile strength than a cast material. The elongation and impact resistance are excellent, and since there is no welding or tightening parts using bolts, the mechanical performance of the wheel itself can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of a method for manufacturing an automobile wheel according to the present invention, FIG. 2 is a schematic diagram showing the second embodiment, and FIG. 3 is a schematic diagram showing the structure of a normal wheel. Partial cross-sectional views, FIG. 4, FIG. 5, and FIG. 6 are partial cross-sectional views showing a main part of a conventional wheel. 11 …… Rolled material (for inner rim), 11a …… Center hole, 13 …… (Outer rim) rolled material, 13a …… Center hole, 15 …… Welded part, 17 …… Protrusion (disk part), 19 ...
… Bolt mounting hole, 21 …… Rim part, 23 …… Valve mounting hole,

Claims (3)

[Claims] 1. A step of concentrically joining a rolled material for an inner rim and a rolled material for an outer rim, which are annular bodies, and a concentric circular portion by welding a portion separated from a peripheral portion of both rolled materials by a predetermined length. A step of forming a welded portion, and a step of forming a ring-shaped protrusion at an appropriate portion of both rolled materials located inside the welded portion to form a disk portion at the protrusion and a portion in the vicinity thereof, A step of opening a bolt mounting hole at an appropriate position of the disc portion, a step of forming a rim portion by opening a rolled material for the inner rim and a rolled material for the outer rim located outside the annular welded portion to the left and right, And a step of opening a valve mounting hole for injecting air into the tire at one end of the rim portion. 2. A method for manufacturing an automobile wheel according to claim 1, wherein a center hole having a large inner diameter reaching from a central portion of the rolled material for an inner rim formed of the annular body to a concentric weld portion is opened. . 3. A method for manufacturing an automobile wheel according to claim 1, wherein a light alloy is used as a material for the rolled material for the inner rim and the rolled material for the outer rim.