WO1986000549A1 - Method of manufacturing light alloy wheels - Google Patents

Abstract

This invention is characterized in that, during the manufacture of an integrally-forged light alloy wheel for an automobile, an outer rim (12), which rises from the outer circumference of a disc surface (11), is formed simultaneously with the pattern of the disc surface (11) by die forging. While the die forging is carried out, an upper die (41) is changed in turn as a mounting base is moved along guide rails provided at an upper portion of a press. In order to form a flange (3) on an inner rim of a wheel having a pattern on its disc surface (11), by a spinning method after the outer rim has been formed, a pair of mandrels for clamping the disc surface (11) therebetween are used, a part or the whole of the clamping end surface of at least one of these mandrels having a shape corresponding to the pattern on the disc surface (11). When it is difficult to extend the inner flange (3) upward along a raising portion of a mandrel, the flange (3) is rolled to a certain extent, and the end portion of this flange (3) is then expanded by a press. The resultant flange (3) is pressed against the mandrel again by a roller to form an inner rim. An unnecessary thin-walled portion (15), which is formed on the disc surface (11) by the die forging, is opened by plasma cutting.

Description

 Specification

[Name of the invention]

 Manufacturing method of light alloy wheels

[ Technical field ]

 The present invention relates to a method of manufacturing a wheel made of a light alloy for a vehicle, which is made of a light alloy such as an aluminum alloy or a magnesium alloy, and particularly to a method of manufacturing the same. On the outer periphery of the disk surface on which the required pattern is formed by the ribs, the inner and outer sides of the wheel protruding on both sides in the axial direction of the wheel are connected to the disk surface. The present invention relates to a method of manufacturing an integrated one-piece molded light alloy wheel.

[Background technology]

 In the production of light alloy wheels for automobiles made of aluminum alloys, magnesium alloys, etc., the wheels are mounted on the disk surface and its outer periphery. A method of manufacturing a piece of shoe alloy wheel, which has a rim and a rim on both the inner and outer sides protruding on both sides in the axial direction of the shoe, is disclosed in Japanese Patent Application Laid-Open No. 56-26648. It is shown in the official gazette.

Here, the disk surface and the rim became a solid body. In the manufacture of a structurally shaped light alloy wheel, the conventional method has been used. Explanation of the method used for the product based on the attached drawings You

 Conventionally, when manufacturing such a wheel, a light alloy material (1) was cut into a required length from a columnar material manufactured by a continuous structure. ), The light alloy material (1) is forged, and as shown in Fig. 15, as shown in Fig. 15, the outer periphery of the circular disk surface (11) is The flanges (2) and (3) protrude from both sides in the axial direction of the tool, and are formed into a substantially H-shaped cross-section. The disk surface (11) has a thick rib ( A required disk pattern consisting of a thin portion (15) between the lip (14) and the lip (14) was formed. After that, a flange (2) protruding outward on the outer periphery of the disk surface (11) thus formed is formed as shown by an alternate long and short dash line in the peripheral diagram. As shown in Fig. 16, a mandrel (20) is placed inside the disk surface (11) and a disk is formed on the outer rim (12), which has a special shape. A tailstock (21) is arranged outside the work surface (11), and the disk surface (11) is sandwiched between the mandrel '(20) and the workman's rod (21). In addition to holding the light alloy material (1) so as to rotate with the rotation of the mandrel (20), a pair of the outer periphery and the inner periphery of the flange (2) are provided. The steps (22) and (23) are arranged so as to face each other, the collar (2) is sandwiched between the rollers (22) and (23), and the light alloy material (1) is placed. Normally 300-40 depending on the mandrel (20) above While rotating at 0 rpra, the rollers (22) and (23) are moved to deform the outer flange (2), forming the outer rim (12) of the required shape. Was

Then, after forming the outer rim (12) in this way, the The flange (3) protruding inward on the outer periphery of the cut surface (11) is formed into an inner rim (13) as shown by a dashed line in FIG. As shown in Fig. 17, when a mandrel (31) having an outer peripheral shape corresponding to the shape of the inner rim (13) is arranged on the inner side of the disk surface (11). In both cases, a holding mandrel (32) is arranged outside the disk surface (11), and the disc is placed between these mandrels (31) and (32). Hold the abutment surface (11) and rotate the light metal alloy (1) along with the mandrels (31) and (32). As shown in the figure, the inner flange (3) ), The rolling roller (33) is pressed against the flange (3) and moved along the inner mandrel (31). 3) is molded to the required inner rim (13) Was

 After that, the unnecessary thin part 5) between the ribs (14) on the disk surface (11) is punched by pressing and lathe turning. Removed by end milling with a milling machine or by a milling machine, leaving the outer periphery of the disk surface (11) with the required disk pattern. To manufacture a 1-piece light alloy wheel that is integrated with rims (12) and (13) protruding on both axial sides of the wheel.

However, in such a wheel, the rising angle of the outer rib (12), which is raised on the outer periphery of the disk surface (11), is generally not larger than that of the wheel. 65 to 80 degrees, and when forming it in the conventional manner, the moving speed of the rollers (22) and (23) sandwiching the outer flange (2) is increased, and By reducing the molding time of these Large force is applied to the rollers (22), (23) and the collar (2), and these

Question that the outer rim (12) is severely distorted or damaged.

On the other hand, slows down the movement speed of these rollers (22 23)

Is that it takes a lot of time to form the outer rim (12).

There was a title. In addition, the light alloy material that rotates like this (1)

If the flange (2) is deformed while being sandwiched between the rollers (22) and (23), the outer rim (12) may be distorted due to rotational fluctuations. The outer rim (12) has a reduced circularity, for example, a Ί5 inch diameter

Wheels have an error of 2.5 to 3 mm in their diameter.

There were also problems such as the inability to accurately mold the side rim (12).

 In forming the inner rim (13), the disk surface

The conventional mandrels (31) and (32) for holding (11) are

Is almost flat, and a flat disk as shown in Fig. 13 is used.

In the case of manufacturing wheels with a squared surface (11), there is a particular problem.

Although it did not grow, the disk with various patterns like today

A wheel with a surface (") is required, and as shown in Fig. 4 the ribs (14) that make up the pattern on the disk surface (11) are the wheels. Axis

The disk surface (11) has a large curvature in the direction, and the disk surface (11) has concave and convex.

In the case of producing a perfect wheel, the end face

Discs with concave and convex due to flat mandrels (31) and (32)

The surface (11) is sandwiched and the light alloy material (υ is rotated to

 When the inner rim (13) is formed at (33), the light alloy material (1) rotates.

Due to the torque and the pressing force of the rolling roller (33), the rib (14) As shown by the broken line in FIG. 18, there was a problem that the image was distorted, and the pattern on the disk surface u 変 形 was deformed. In addition, when the flange (3) is pressed by the rolling roller (33) as described above, and the flange (3) is rolled along the inner mandrel (31). When the rolled flange (3) comes into contact with the rising portion (31a) of the mandrel (31), further rolling becomes difficult, and the inner rim (13) is hardly rolled. There was also a problem that the terminal could not be sufficiently started up.

 Further, in removing unnecessary thin portions (15) between the ribs (14) on the disk surface (11), a conventional press is used. In the blanking process, many dies must be prepared according to the pattern of the disk surface (11), and the cost for the dies increases. Along with the disk surface (11) having a complex pattern and the disk surface (11) curved as described above, a thin wall like this is used. It was very difficult to punch out part (15). In addition, the workability is poor in machining with a lathe or end milling with a milling machine, and in particular, end milling with a milling machine. In drilling, it takes time to drill many holes, and the amount of material loss increases depending on the type of processing. was there .

[Disclosure of Invention]

This invention uses a light alloy material made of an aluminum alloy, a magnesium alloy, or the like, and a disk surface and a rim on an outer periphery thereof are combined with a body. Lightweight alloy alloy wheel for automobiles This has been done not to solve the above-mentioned problems in the production of tools.

 In the manufacturing method according to the present invention, the outer rim, which is raised at a sharp angle to the outside in the axial direction of the wheel on the outer periphery of the disk surface of the wheel, is provided. The shape and shape of the disk surface are formed at the time of molding according to the mold structure, so that the outer rim can be formed easily and in a short time together with the pattern formation on the disk surface. In addition to this, it is possible to form the outer rim with high roundness and accuracy. Also, such die forging is performed using several types of Ji die type and lower die type, and a guide rail is provided at the top of the press device. And several types of upper dies are mounted under the mounting base that runs along the guide rail, and the mounting base is moved along the guide rail to move the upper die. The dies are replaced frequently, and the replacement of the upper dies is made quick and easy. '

Further, according to the present invention, as described above, after forming the outer rim together with the pattern of the disk surface by die forging, the disk surface is subjected to a pair of mandling. To form the inner rim of the required shape by spinning processing, the drumaku that is sandwiched by the barrel and protruded inward at the outer periphery of the disk surface is formed. On the disk surface, if the rib that constitutes the pattern is curved in the axial direction of the wheel and has a concave-convex pattern, the disk surface should be Of the pair of mandrels to be clamped, at least one mandrel is A part of the end face that clamps the disk surface or the whole is molded into a shape corresponding to the uneven pattern of the disk surface, and such a mandrel is used. The end face of the disc is aligned with the concave / convex pattern on the disc face so that the disc face is pinched by a pair of mandrels, and the inner rim is used for spinning. Thus, deformation of the disk surface during molding is prevented.

 Further, in the present invention, the disk surface is sandwiched between the pair of mandrels as described above, and is protruded inward from the outer periphery of the disk surface. The flange is rolled along the outer peripheral surface of the inner mandrel by a rolling roller to form the inner rim, and the flange is rolled as necessary. The outer end of the flange is expanded outward with a press, etc., and the expanded flange is pressed again along the mandrel by the rolling roller. The inner rim with the raised edge is easily formed. In addition, when spinning the inner rim as in the above, use a rolling roller with a concave groove formed in the center of the roll surface. In conjunction with the forming of the rim, the rolling rollers with the concave grooves are used to provide ridges for stopping the tires at the required positions on the outer rim and the inner rim, respectively. I am trying to do it.

In addition, in the present invention, the opening of the unnecessary thin portion existing between the ribs formed on the disk surface by the die forging is formed by a plasma cutter. This is true even if the disk surface has a complex pattern or the disk surface is curved. The opening of such a thin part is made easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which the outer rim is formed by die forging.

FIG. 2 is a front view showing a state in which the press device is provided with an upper die converting device.

Fig. 3 is a front view showing a part of the mesh pattern on the disk surface.

Fig. 4 is a front view showing a spoke-shaped disk surface, Fig. 5 is a front view showing a simple-shaped disk surface, and Fig. 6 is a light material. FIG. 4 is a cross-sectional view showing a state in which a flat disk surface and an outer rim are formed by die forging and a flat pattern is formed.

Fig. 7 shows a cross section of a light alloy material formed by die forging and forming a disk surface and an outer rim in which the rib waits for a pattern of irregularities curved in the axial direction of the wheel. It is a figure,

Fig. 8 is a cross-sectional view of a disk with a concave-convex pattern, showing the inner flange on the outer periphery of the surface being spun. 8 is a cross-sectional view showing a state in which the inner flange, which has been subjected to the spinning process as shown in FIG.

FIG. 1 is a cross-sectional view showing a state in which the inner flange expanded as shown in FIG. 9 is re-spun to form an inner rim. FIG. 11 is a front view of a device for opening an unnecessary thin portion between ribs on a disk surface.

FIG. 12 is a partially enlarged cross-sectional view showing a state in which a thin portion is opened by the apparatus shown in FIG.

Fig. 13 is a cross-sectional view of a wheel with a flat disk surface pattern.

Fig. 14 is a cross-sectional view of a wheel whose disk surface has concave and convex patterns.

FIG. 15 is a cross-sectional view showing a state in which a light metal material is forged into a substantially H-shaped cross section to form a flat disk surface.

Fig. 6 is a cross-sectional view showing a state in which the outer flange of the light metal material shown in Fig. 5 is formed into an outer rim of a required shape by spinning. Ό,

Fig. 17 shows that the outer rim is formed on the outer periphery of the flat disk surface, and then the inner flange is formed into the required inner rim by spinning. FIG. 3 is a cross-sectional view showing

FIG. 18 is a partially enlarged front view showing a state in which the pattern on the disk surface having irregularities is deformed.

[Best Mode for Carrying Out the Invention] A material made of a light alloy such as an aluminum alloy or a magnesium alloy is forged, and a disk surface and a rim are formed. The invention of the present invention for producing a light alloy wheel for an automobile of a one-piece forged die that has become a body. Examples will be described in detail with reference to the accompanying drawings.

 In this example, the material used to manufacture the wheel was

Usually, aluminum is manufactured into a long cylindrical shape by continuous structure.

Cut light alloy materials such as aluminum alloys and magnesium alloys to the required length.

As shown in Fig. 1, the upper and lower dies, which are engraved to the required shape, are used as shown in Fig. 1.

Press molding between the disk molds (41 42) and apply it to the disk surface (11)

It consists of a thick rib (14) and a thin part (15) between the ribs (14).

In addition to forming the required disk pattern, it protrudes outward in the axial direction of the wheel on the outer periphery of the disk 'surface (11).

The molding of the outer rim (12) is performed by forming the pattern on the disk surface (11).

This is done during the week.

 Here, the outer rim (12) stands from the outer periphery of the disk surface (11).

The raising angle is 65 to 80 degrees as described above, and the light alloy element is used.

This is because the material (1) needs to be greatly deformed.

Die forging using the lower dies (41) and (42) is generally a light alloy

Heating the material (1)

In die forging, there are usually several types of upper die (41).

Using the lower and upper dies (42), these upper and lower dies (41) and (42) are converted into quadratic, and the light alloy material (1) is deformed to the outside to make it

The rim (12) is to be formed. Die forging like this

In this embodiment, as shown in FIG.

In addition, the guide rail (43) is placed horizontally on top of the pressing device (40). At the same time, it is possible to run along this guide rail (43). Under the mounting base (45) on which the moving rollers (44) are provided, several types of Die type (41) (2 types in the example shown in the figure) is attached, and this mounting base (45) is moved by the hydraulic cylinder (46) provided on the guide rail (43). And the upper die (41) is exchanged. Then, the positioning pin (47) provided on the press device (40) and the first engaging recess (48a) provided on the mounting base (45) are fitted and mounted. In the position where the base (45) is locked, the first upper die type (41) is located above the lower die type (42) fixed on the bed (49). Also, at the position where the positioning pin (47) is engaged with the second engaging recess (48b) of the mounting base (45) and the mounting base (45) is locked, A second upper die (41) is positioned above the lower die (42). In this way, the upper die (41) is replaced, and the light alloy material (1) is forged with the second die and the second upper die (41). In such a case, the upper die (41) can be replaced in a short time, and the light alloy material (1) needs to be re-ripened each time the die is replaced. It will be possible to continuously perform die forging of light alloy material (1).

The pattern formed on the disk surface (11) depends on the shape engraved on the upper and lower die dies (41) and (42) used in the final manufacturing process. In other words, for example, the mesh pattern as shown in Fig. 3, the spoke pattern as shown in Fig. 4, the simple pattern as shown in Fig. 5, etc. are free. It can be formed into a unique pattern. In addition, such a disk surface (a pattern of an i-plane is not limited to a flat one as shown in FIG. 6, but a pattern constituting a pattern as shown in FIG. 7). The valve (14) may be formed to have a large curvature in the axial direction of the wheel and a concave-convex pattern.

 After the pattern of the disk surface (11) and the outer rim (12) are formed in this manner, the wheel is positioned in the axial direction on the outer periphery of the disk surface (11). The flange (3) protruding inward is formed into the required inner rim (13) by spinning.

Here, as shown in Fig. 6, the outer circumference of the disk surface (1) with a flat pattern is less curved on the rib (14) on the disk surface (11). When the inner rim (13) is formed in the same manner as in the conventional case, as shown in Fig. 17, the inner rim (13) must be shaped according to the shape of the inner rim (13) to be formed. The mandrel (31) having the outer peripheral shape is placed inside the disk surface (11), and the holding mandrel (32) is placed outside the disk surface (11). The disk surface 1) is sandwiched between a pair of the mandrels (31) and (32) having substantially flat end faces, and the mandrels (31) are sandwiched between the mandrel (31) and the mandrel (31). ) Along with (32), the light alloy material (1) was rotated by a motor through a speed converter at a speed of usually 300 to 400 rpm, and arranged on the outer periphery of the inner flange (3). Rolling roller (33 ) Is controlled by an oil-piezoelectric or hydraulic support, and the ladder (3) on the inside of the light alloy material (1) · rotated by the rolling rollers (33). Then, the collar (3) is rolled along the inner mandrel (31). However, as shown in Fig. 7, the ribs (14) constituting the pattern on the disk surface (11) are greatly curved in the axial direction of the wheel, and the uneven pattern is formed. When the inner rim (13) is formed around the outer periphery of the disk surface (11), the pair of mandrels (31) and (32) having substantially flat end faces as described above is formed. Therefore, when the disk surface (11) is sandwiched and the inner flange (3) is spin-finished, the pattern of the disk surface (11) is deformed as in the conventional case. For this reason, in the embodiment shown in FIG. 8, a pair of mandrels (31) whose end surfaces have a shape corresponding to the concave and convex pattern of the disk surface (11) are used. Using (32), align the end face of the mandrel (31) (32) with the concave and convex with the concave and convex pattern of the disk surface (11), and Squeeze the surface (11) Et al Ma down de Re Lumpur (31) (32) that has to be nipped have you to 圜. Then, in this state, as described above, the light alloy material (1) is rotated together with the mandrels (31) and (32) of the 6 and the inner flange (3) is rotated. ) Is rolled by a rolling roller (33). In this case, the twisting force due to the rotating torque of the light alloy material (1) and the pressing force of the rolling mill (33) is applied to the disk surface (11). Even if it is added, the discs are formed by the mandrels (31) and (32) whose end faces are formed on the concave and convex patterns of the disc surface (11). The deformation of the pattern on the surface (11) is suppressed. In this embodiment, when spinning the inner flange (3) on the outer periphery of the disk surface (11) having a concave and convex pattern, A pair of mandrels whose end faces have shapes corresponding to the concave and convex patterns on the disk surface (11) It merely shows an example using the rims (31) and (32), but the outer rim (12) is attached to the outer periphery of the disk surface (11) as in the prior art. If the disk surface (11) has a concave-convex pattern during machining, use a mandrel (31) (32) like this. It is, of course, possible to sandwich the disk surface (11) and thereby suppress the deformation of the pattern on the disk surface (11).

In addition, as described above, the disk surface (11) is sandwiched between the mandrels (31) and (32), and the light alloy material (1) is placed in these mandrels. By rotating together with the barrels (31) and (32), the inner flange (3) on the outer periphery of the disk surface (11) is rotated by the rolling roller (33). When the inner rim (13) is formed by rolling along the barrel (31), the rolled flange (3) corresponds to the rising part (31a) of the barrel (31). The flange (3) is not further rolled upon contact, and the edge of the inner rim (13) may not be able to be raised. In such a case, in this embodiment, after the collar (3) is rolled to a certain extent by the rolling roller (33), as shown in FIG. The end of the rolled flange (3) is expanded outward by an upper and lower die type (51 52) for expansion, and the end of the flange (3) is mandrel. It is formed so as to exceed the rising part (31a) of (31). Then, after expanding the end of the flange (3) in this way, as shown in FIG. 10, the disk surface (11) is again attached to the mandrel (31). ) (32) and rotate the light alloy material (1) to rotate the expanded flange (3) to the mandrel (31) inside the rolling roller (33). To the end The inner rim (13) with the raised portion is formed. In the example shown in FIG. 10, a groove (33b) is provided at the center of the roll surface (33a) as a rolling roller (33) for forming the inner rim (13). The formed one is used, and the outer groove (12) and the inner rim (13) are tied to the required positions by the concave groove (33b) of the rolling roller (33). The ridges (12a) and (13a) for stopping the tire are provided around.

 After forming the inner rim (13) as described above, the unnecessary thin portion (15) existing between the lips (14) on the disk surface (11) is opened. Then, as shown in Fig. 13 and Fig. 14, a one-piece light weight with the disk surface (11) and the rims (12) and (13) integrated with each other. It manufactures alloy wheels.

Here, in opening the thin portion (15), in this embodiment, the light alloy material (1) in which the inner rim (13) is formed as described above is used. As shown in Fig. 11, the turntable (62) provided at the upper end of the support leg (61) is supported by the turntable (2). On the 63), the required number of positioning and mounting were carried out, and at the tip of the working arm (64), the nozzle for blowing the plasma arc (65) was attached. The work area is stored in advance in a part of the memory of the working port (66), and the working port port (66) is designated by a command from the memory part. Actuation of 66) Activate the arm (64) to move the blowing nozzle (65), and by the plasma arc blown from the blowing nozzle (65). As shown in Figure 12 In addition, an unnecessary thin portion (15) is cut and opened. For this reason, even if the disk surface (1 mm has a complicated pattern or the disk surface (11) is curved), the pattern may be deformed. In addition, unnecessary thin-walled parts (15) can be easily opened, and such cutting is performed overnight in the plasmar. In general, a cutting current of 148 A (29 to 30 A for pilot work) is used as the cutting current. At 2 m / in I η, and use 6 kgf / on 'compressed air as cutting gas.

 It is not always necessary to open such a thin portion (15) after forming the inner rim (13), but before forming the inner rim (13). It is also possible to go to

[Industrial applicability]

As described in detail above, the method for manufacturing a wheel made of light alloy according to the present invention is such that the wheel is projected on both sides in the axial direction of the wheel on the disk surface and the outer periphery thereof. To manufacture an integrally forged die-type light alloy wheel made of aluminum alloy, magnesium alloy, etc., with rims on the inner and outer sides formed on the body. At the same time, the outer rim, which rises at a sharp angle outward on the outer periphery of the disk surface, is formed at the same time as the disk surface pattern is formed by die-casting. As a result, the outer rim can be formed easily in a short time and at the same time, accurate molding with roundness can be performed. Yes. In such a structure, the light alloy material is heated and deformed by using several types of upper and lower dies. In this case, a guide rail is provided at the top of the press device, and several upper die types are mounted under the mounting base that runs along the guide rail. Is moved along the guide rail so that the upper die can be replaced with the upper die so that replacement of the upper die can be performed quickly and easily. However, it is not necessary to re-ripen the light alloy material every time the mold is changed, so that continuous die forging can be performed.

Further, according to the present invention, after forming the outer rim together with the disk surface pattern by the die structure as described above, the disk surface is formed into a pair of mandrel. The light alloy material is rotated together with the mandrel by holding it with the wrench, and the flange protruding inward on the outer periphery of the disk surface is rolled. In the process of rolling along the outer surface of the inner mandrel and spinning the inner rim of the required shape, the surface of the mandrel is rolled along the disk surface. When a rib forming a pattern is curved in the axial direction of the wheel and waits for a pattern with concave and convex portions, a pair of mandrels sandwiching the disk surface is used. However, at least one of the mandrels has a part or all of the end face that clamps the disk surface. Use a mold that is shaped to correspond to the concave / convex pattern on the disk surface, and align the end face of such a mandrel with the concave / convex pattern on the disk surface. The disk surface is sandwiched between a pair of mandrels, and the disk surface with a concave and convex pattern Even when spinning the inner rim on the outer periphery, the concave and convex pattern on the disk surface is not deformed.

 Also, as described above, the inner flange on the outer periphery of the disk surface is rolled by the rolling roller to spin the inner rim of the required shape. For example, when the inner flange is to be raised along the rising portion of the mandrel, the present invention requires that the inner flange be rolled to a certain extent and then the rolled flange be formed. The end of the mandrel with a press or the like to extend beyond the rising part of the mandrel, and then reopen the expanded flange with a mandrel by a rolling roller. The inner rim with the raised edge is easily formed by pressing it onto the inner rim. Furthermore, when spinning the inner rim in this way, when using a rolling roller having a concave groove in the center of the roll surface, Simultaneously with the forming of the inner rim, the grooves for the rolling rollers allow the outer rim and the inner rim to be provided at the required positions on the outer rim and the inner rim, respectively. It becomes so.

 In addition, in the present invention, an unnecessary thin portion existing between the ribs formed on the disk surface by the mold structure is opened by the plasma cut. The disk surface should be deformed even if the disk surface pattern is complex and curved. Rather, the opening of such a thin-walled part is made easy.

Claims

 Scope of the request In manufacturing an integrally cut type light alloy wheel made of aluminum alloy, magnesium alloy, etc., the light alloy material (1) was die forged. The required pattern is formed on the disk surface (11) by the ribs (14), and the wheel is disposed on the outer periphery of the disk surface (11). A method for manufacturing a wheel made of light alloy, characterized in that an outer rim (12) protruding outward in the axial direction is formed around the disk surface (11) at the time of circumference. The light alloy material (1) was forged using several types of upper die (41) and lower die (42), and placed on the outer periphery of the disk surface (11). In order to form the outer rim (12) protruding outward in the axial direction of the wheel, a guide rail (43) is horizontally mounted on the upper part of the press device (40). At the same time, several upper die types (41) are mounted under the mounting base (45) that runs along the guide rail (43), and the mounting base (45) is mounted. Claim 1 characterized by that the upper die type (41) is replaced by a secondary exchange by moving the upper die type (41) along the guide rail (43). Manufacturing method of light alloy wheels. The light alloy material (1) is molded, and the rib (14) is bent in the axial direction of the wheel, and the disk surface (11) having an uneven pattern is formed on the rib (14). After forming an outer rim (12) protruding outward in the axial direction of the wheel on the outer periphery, the disk surface (11) is formed. A flange protruding inward in the axial direction of the wheel on the outer circumference of the wheel (3) is formed by spinning to form the inner rim (13) of the required shape, and a pair of mandrels that hold this disk surface (11). (31) At least one or all of the end faces of at least one of the mandrels of the outer surface of the disk surface (11) and / or Is used in the shape corresponding to the concave and convex of the inner surface, and the disk surface (11) is sandwiched by these mandrels (31) and (32). The light alloy material C1) is rotated together with these mandrels (31) and (32) so that the light alloy material C1) is axially inward of the wheel on the outer periphery of the disk surface (11) The protruded flange (3) is rolled along the outer peripheral surface of the inner mandrel (31) by the rolling roller (33) to form an inner rim (13) of a required shape. It is characterized by A method for producing a light alloy wheel according to claim 1 or 2. A flange (3) protruding inward in the axial direction of the wheel on the outer periphery of the disk surface (11) is provided on the inner mandrel by the rolling roller (33). (31) is rolled along the outer peripheral surface, and the flange (3) is raised along the rising portion (31a) of the mandrel (31) to form an inner rim of a required shape. In forming into (13), the flange (3) is rolled to a certain extent along the outer peripheral surface of the inner mandrel (31) by the rolling roller (33). After that, the end of the rolled flange (3) is expanded with a press or the like, and the expanded flange (3) is again rolled. 33), the above mandrel (31) and rises along the rising portion (31a) to form the inner rim (13) whose edge is raised. 3. The method for producing a light alloy wheel according to any one of the first to third aspects. At the outer periphery of the disk surface (11), the dotaku (3) protruding inward in the axial direction of the wheel is turned into a mandrel inside the rolling roller (33). When rolling along the outer peripheral surface of (31) to form the inner rim (13) of the required shape, a concave groove (33b) is formed at the center of the roll surface (33a). The outer rim (12) and the inner rim (13) are formed by the concave groove (33b) of the rolling roller (33). Claims (1) to (4), characterized in that ridges (12a) (13a) for stopping tires are respectively provided around required positions. How to make a light alloy wheel. Due to the die forging of the light alloy material (1), unnecessary thin portions (15) existing in the ribs (14) 圊 formed on the disk surface (11) are removed by plasma plasma. The method for producing a wheel made of light alloy according to any one of claims 1 to 5, characterized in that the wheel is opened by a tube.