JP2010095011A - Disk for wheel, vehicular wheel, and method of manufacturing the disk for wheel and the vehicular wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk for a wheel and a vehicular wheel whose manufacturing yield is high and whose weight can be reduced. <P>SOLUTION: The disk for a wheel, which is structured by carrying out the cladding joint of a plurality of metal plates 40, includes: a hub mounting part 6; spoke parts 2, which extend radially from the hub mounting part toward the outer edge of a disk 10, and an annular disk outer peripheral part 4 connected to the outer ends of the spoke parts. The hub mounting part, the spoke parts and the disk outer peripheral part include hollow parts 9a, 9b of one piece expanded at the joint boundary surfaces of the metal plates. Besides, the hollow parts are closed by the outer edge 4f of the disk peripheral part and the hub mounting part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disk used for a steel wheel for a vehicle such as an automobile, an agricultural vehicle, and an industrial vehicle, a steel wheel for a vehicle, a disk for a wheel, and a method for manufacturing the steel wheel for a vehicle.

In recent years, there has been a further demand for weight reduction of aluminum wheels for automobiles in order to increase the price of aluminum raw materials and gasoline and to prevent global warming.
Conventionally, since aluminum wheels are manufactured by casting, the product yield is low, and material is wasted by grinding the rough surface after casting.
On the other hand, a casting wheel is known in which a metal foam is incorporated in a spoke portion of an aluminum wheel to form a hollow portion and the thickness of the spoke is reduced (see Patent Document 1).
Further, a technique is known in which a disk-shaped disk and a cylindrical rim-corresponding portion are formed from a disk such as aluminum and then formed into a rim portion by spinning (see Patent Document 2).
Furthermore, the present inventors have proposed a clad material in which a joining interface is expanded when clad joining an aluminum plate (see Patent Document 3).

JP-A-11-240302 JP-A-10-278501 JP 2002-88433 A

However, since the wheel described in Patent Document 1 is a cast wheel, the yield is still low. Further, since the wheel described in Patent Document 2 manufactures a disk from an aluminum disc, it is necessary to increase the thickness in order to ensure strength, and it is difficult to achieve a sufficient weight reduction.
Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a steel wheel for a vehicle that has a high manufacturing yield and can be reduced in weight, and a method for manufacturing a disk and a steel wheel for a vehicle.

In order to achieve the above object, a wheel disk according to the present invention is formed by clad joining a plurality of metal plates, and a plurality of hub attachment parts and a plurality of radial extensions extending from the hub attachment part toward the outer peripheral edge of the disk. Spoke portion and an annular disc outer peripheral portion connected to the outer end of the spoke portion, and the hub mounting portion, the spoke portion and the disc outer peripheral portion are expanded at the joint interface between the metal plates. Steel having an integral hollow portion, and the hollow portion is closed by the outer peripheral edge of the outer peripheral portion of the disk and the hub mounting portion.
In this way, the hub mounting part, the spoke part and the disk outer peripheral part expand and have an integral hollow part, so the hub mounting part, the spoke part and the disk outer peripheral part protrude in the same manner as the reinforcing ribs, improving the strength. In addition, the thickness of the metal plate can be reduced to reduce the weight of the disk. In addition, since the hub attaching portion, the spoke portion, and the outer peripheral portion of the disk are expanded and projecting, the unevenness becomes remarkable and the design can be improved.
Further, since the disk is formed from a metal plate instead of casting, the manufacturing yield is also improved.
Further, since the hollow portion is closed by the outer peripheral edge of the outer peripheral portion of the disk and the hub mounting portion, the hollow portion is completely closed, the hollow portion can be prevented from being crushed by a load, and the strength is improved.

The hollow portion may be formed by introducing a high-pressure fluid into a joint surface coated with a pressure-bonding inhibitor when the metal plates are clad-joined.
If it does in this way, the joining interface of metal plates can be easily expanded and a hollow part can be formed.

The steel wheel for vehicles of this invention welds the said disk for wheels, and a rim | limb.
The vehicle steel wheel according to the present invention is a vehicle steel wheel in which the wheel disk and a rim are integrally formed, and the rim includes the metal plate connected to the outer peripheral edge of the outer periphery of the disk. It is formed by spinning along the axial direction.

  The wheel disk manufacturing method according to the present invention includes a region corresponding to a hub mounting portion of the disk and a radial direction from the hub mounting portion toward an outer peripheral edge of the disk among the opposing surfaces of the plurality of metal plates to be the disk. An application step of applying an anti-crimping agent to a region corresponding to a plurality of spoke portions extending to a region and a region corresponding to an outer peripheral portion of an annular disk connected to an outer end of the spoke portion; A clad joining step of laminating and joining the metal plates, and introducing and expanding a high-pressure fluid into the coating region of the clad-joined metal plate, the hub attachment part, the spoke part, and the outer circumference of the disk A hollow portion forming step of integrally forming the hollow portion of the portion.

  The method for manufacturing a steel wheel for a vehicle according to the present invention is to weld a rim to a disk manufactured by the method for manufacturing a wheel disk.

  The vehicle steel wheel manufacturing method of the present invention is a vehicle steel wheel manufacturing method in which a disk and a rim manufactured by the wheel disk manufacturing method are integrally formed, and in the coating step, An outer periphery non-application area where the anti-bonding agent is not applied is provided on the outer peripheral side of an area corresponding to the outer periphery of the annular disk on the opposing surface of the metal plate, and the wheel disk is manufactured. A rim forming step of spinning the metal plates interposed in the region to form a rim integral with the wheel disk.

  The vehicle steel wheel manufacturing method of the present invention is a vehicle steel wheel manufacturing method in which a disk and a rim manufactured by the wheel disk manufacturing method are integrally formed, and in the coating step, An outer peripheral non-application area where the anti-bonding agent is not applied is provided on the outer peripheral side of an area corresponding to the outer peripheral portion of the annular disk, and the metal plate is provided on the outer peripheral side of the outer peripheral non-application area. After applying the anti-bonding agent to provide the outermost peripheral application region, and manufacturing the wheel disc, the gap between the metal plates interposed in the outermost peripheral application region is widened, A rim forming step of spinning a metal plate to form a rim integral with the wheel disk.

  According to the present invention, it is possible to provide a wheel disk and a vehicle steel wheel that have a high manufacturing yield and can be reduced in weight.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a perspective view showing a vehicle wheel according to a first embodiment of the present invention. The vehicle wheel 30 is formed by welding an aluminum or aluminum alloy rim 20 and a disk (wheel disk, hereinafter referred to as “disk” for the sake of simplicity). The rim 20 is formed into a substantially cylindrical shape by round tube forming after rolling and welding an aluminum stencil, and a tire is accommodated between an outer flange and an inner flange formed at both ends of the rim. The rim 20 may be formed in a substantially cylindrical shape by forming an aluminum tube by circular tube forming, or may be formed in a substantially cylindrical shape by casting, or may be formed in a substantially cylindrical shape by flow forming after casting. .
1 is referred to as “front side (surface)”, and the lower side (rim 20 side) in FIG. 1 is referred to as “back side (surface)”. The “axial direction” refers to a direction perpendicular to the surface of the disk 10. The “radial direction” refers to the diameter direction of the surface of the disk 10 (the direction from the center toward the outer periphery).

The disk 10 is formed by clad joining two aluminum plates, and has a substantially disc-shaped hub mounting part 6 and ten long-spoke spoke parts 2 extending radially from the hub mounting part 6 toward the outer peripheral edge of the disk 10. And an annular disc outer peripheral portion 4 integrally connected to the outer end 2 e of the spoke portion 2. A hub hole 6a is opened at the center of the hub mounting portion 6, and a plurality of (five) bolt holes 6b for mounting the hub on the outer peripheral side of the hub hole 6a are formed concentrically.
Further, ten substantially triangular decorative holes 8 are formed between two adjacent spoke portions 2, 2, the outer peripheral end of the hub attaching portion 6, and the inner peripheral end of the disc outer peripheral portion 4. The decoration hole 8 is usually formed for weight reduction and heat dissipation.
Note that the number of bolt holes 6b and decorative holes 8 formed can be changed according to the required specifications.

  Examples of the material of the metal plate used for forming the disk include aluminum, aluminum alloy, steel, stainless steel, titanium, titanium alloy, and the like. However, aluminum or aluminum alloy is preferable because it easily expands as described later (hereinafter referred to as “aluminum”). Aluminum or aluminum alloy is referred to as “aluminum” without any particular distinction). As the aluminum, JISH4000: 6061, 5454, 5052 or the like is suitable for the wrought material.

On the other hand, the spoke part 2, the disk outer peripheral part 4, and the hub attachment part 6 (except for the vicinity of the bolt hole 6b) are curved on the front and back of the disk.
In this embodiment, the outer peripheral edge 4f of the disk outer peripheral part 4 is configured to serve also as the outer flange of the rim 20, and the design is improved by showing the disk integrally. The flange may not be formed, and the outer periphery of the disk may be fitted to the inner surface of the outer flange of the rim.

2 is a cross-sectional view of the disk 10 taken along the line II-II in FIG. 1 (cut along a plane parallel to the axial direction of the disk). The surface of the spoke portion 2 is curved so as to fall from the disk outer peripheral portion 4 toward the hub mounting portion 6, is flat near the center portion of the spoke portion 2, and is further curved so as to fall toward the hub mounting portion 6. is doing.
On the other hand, the surface of the hub mounting portion 6 is curved so as to fall from the outer peripheral side toward the back surface side of the disk 10 toward the side wall of the hub hole 6a. A cylindrical portion 6h is formed in the vicinity of the bolt hole 6b on the surface of the hub mounting portion 6 toward the back surface of the hub mounting portion 6, and the cylindrical portion 6h surrounds the bolt hole 6b on the back surface of the disk 10. It touches. A bolt for fixing the disk 10 can be inserted through the cylindrical portion 6h. The back surface of the hub mounting portion 6 is a flat surface.

The disk outer peripheral portion 4 is located on the most surface side of the disk 10. Further, a flat outer rim flange (outer peripheral edge) 4f is formed on the rear surface of the outer peripheral portion 4 of the disk from the outer peripheral edge toward the center, and is parallel to the axial direction from the inner end of the outer rim flange 4f and on the disk 10. An outer bead sheet 4b that falls to the back surface side is formed, and is further smoothly connected to the outer side wall 4s from the bead sheet 4b toward the center. A protrusion 4t is formed in parallel to the axial direction from the end of the outer side wall 4s.
On the other hand, the rim 20 has a drop portion 20d having the smallest diameter, and an inner sidewall 20s extends radially outward from the drop portion 20d. Further, an inner bead sheet 20b is connected in parallel to the axial direction from the inner sidewall 20s, and an inner rim flange 20f is formed radially outward from the inner bead sheet 20b.
The vehicular wheel 30 is assembled by abutting and welding the projection 4t having substantially the same diameter and the tip of the drop portion 20d.

Here, the left side of the center line of FIG. 2 shows the case where the spoke part 2 having the bolt hole 6b is cut at the center in the width direction, and the outer side from the inner end (end on the hub attachment part 6 side) 2a of the spoke part 2 A hollow portion 9a is formed up to the end (end on the disk outer peripheral portion 4 side) 2e. Further, the hollow portion 9a is integrally communicated with the inside of the disc outer peripheral portion 4 from the outer end 2e, and is closed at the outer peripheral edge 4f of the disc outer peripheral portion 4. On the other hand, the hollow portion 9 a is closed as the inner end 2 a of the spoke portion 2 at the outer edge of the cylindrical portion 6 h constituting the outer periphery of the hub attachment portion 6.
Further, the vicinity of the bolt hole 6b of the hub attachment portion 6 does not have a hollow portion, and the above-described cylindrical portion 6h is formed.

The right side of the center line in FIG. 2 shows a case where the spoke part 2 not having the bolt hole 6b is cut at the center in the width direction. A hollow part 9b is formed inside the hub attachment part 6, and the hollow part 9b has an outermost part. The inner peripheral side is closed by the side wall of the hub hole 6a. Further, the hollow portion 9 b is integrally communicated with the inside of the spoke portion 2 and the disc outer peripheral portion 4 and is closed at the outer peripheral edge 4 f of the disc outer peripheral portion 4. Thus, the hollow portion 9b is integrally formed from the hub mounting portion 6 to the disk outer peripheral portion 4.
Although not shown, when the disk 10 is cut in the radial direction so as to pass through the decorative hole 8, a hollow portion is formed inside the hub mounting portion 6, and this hollow portion is closed by the inner peripheral side wall of the decorative hole 8. It is done.

  Here, the thickness of the hub mounting portion 6 in the vicinity of the bolt hole 6b is substantially equal to the thickness 2t of the two clad bonded aluminum plates (each having a thickness t). On the other hand, the thickness of the spoke part 2 and the disk outer peripheral part 4 in which the hollow part 9a is formed, and the thickness of the hub mounting part 6 in the part in which the hollow part 9b is formed are substantially equal to t. This is because the hollow portions 9a and 9b are formed by expanding at the joining interface between the two aluminum plates as described below.

FIG. 3 is a view showing an example of a metal plate used for manufacturing the disk 10 in the vehicle wheel according to the first embodiment of the present invention.
First, two rectangular aluminum plates 40 (only one is shown in the figure) serving as a disk are prepared. Of the opposing surfaces of each aluminum plate, a region 6x corresponding to the hub mounting portion, a region 2x corresponding to the spoke portion, An anti-bonding agent (black portion in the figure) is applied to the region 4x corresponding to the outer peripheral portion of the disk. Further, an anti-crimping agent is also applied to the linear introduction portion 42 for introducing a high-pressure fluid (gas) from the region 4x corresponding to the outer peripheral portion of the disk to the outer edge of the aluminum plate 40.
However, in the region 6x corresponding to the hub mounting portion, the anti-crimping agent is not applied to the hub hole peripheral region 6ax and the bolt hole peripheral region 6bx, and the anti-crimping agent is not applied to the decorative hole peripheral region 8x. This is because the plate is inflated into a bag shape to form a hollow portion, and therefore, a portion where the plates are joined to each other without applying the anti-bonding agent is required to close the hollow portion. In addition, application | coating of a crimping | compression-bonding agent may be performed only to the single side | surface of the opposing surface of each aluminum plate according to crimping | compression-bonding and expansion conditions, and may be performed to both surfaces.

Any anti-bonding agent may be used as long as it prevents metal bonding between the aluminum plates 40. For example, a paste of carbon or molybdenum powder or various solid lubricants can be used. Further, the anti-bonding agent can be applied by, for example, screen printing.
Next, after appropriately drying the coated portion, the two coated aluminum plates 40 are laminated so that the corresponding coated portions overlap each other, preheated, and then clad rolled (joined). In order to make the rolling reduction at the time of rolling uniform, it is preferable to clad and roll the aluminum plate 40 with a rectangular shape (constant width), and then trim unnecessary outer portions.

FIG. 4 shows a process of forming a hollow portion by expanding the coating region of the anti-crimping agent in the clad plate after clad rolling, and is a cross section cut along a plane parallel to the axial direction of the disk as in FIG. FIG.
First, a hub hole 6a1, a bolt hole 6b1, and a decorative hole (not shown) are punched out from the clad rolled aluminum plate (FIG. 4A). However, this punching may be performed after forming a hollow portion described later.
In addition, the application | coating area | region of the crimp prevention agent shown in FIG. 3 is represented as area | region 9ax and 9bx in Fig.4 (a). The regions 9ax, 9bx are regions in which the above-described regions 2x, 4x, 6x communicate with each other, and the regions 9ax, 9bx expand to form hollow portions 9a, 9b. However, in FIG. 4A, the surface which is the front surface side of the disk is the lower surface side. Therefore, the region 9ax corresponds to the hollow portion 9a in FIG. 2, and the region 9bx corresponds to the hollow portion 9b in FIG.
In addition, the outer peripheral edge and the inner peripheral edge of the regions 9ax and 9bx are respectively closed, and these correspond to the outer peripheral edge of the disk outer peripheral portion and the hub mounting portion, respectively. The inner peripheral edge of the region 9bx extends to the vicinity of the side wall of the hub hole element hole 6a1, and the inner peripheral edge of the region 9ax extends to the vicinity of the side wall of the bolt hole element hole 6b1.

Next, the clad plate is appropriately preheated and press-molded (FIG. 4B). In this press molding, the disk 10 is provided with a concavo-convex shape that is insufficient only by the expansion described later, thereby improving the design and strength.
Here, a falling part and a flat part on the surface side of the spoke part 2 and a shape on the surface side of the hub attaching part 6 and a cylindrical part 6h are formed by press molding.
The broken line S in FIG. 4B shows the contour of the back surface of the finally obtained disk. In the next step, the regions 9ax and 9bx are expanded to the broken line S in the mold.

That is, the press-molded clad plate is heated to 500 to 550 ° C., a high-pressure fluid (gas) is introduced from the introduction portion 42 (not shown), and the regions 9ax and 9bx are expanded to form the hollow portions 9a and 9b. (FIG. 4C). In addition, when heating a clad board to 500-550 degreeC as mentioned above, gas, such as compressed air, can be used as a high pressure fluid. Further, when the clad plate is brought to room temperature without heating, a liquid such as water or oil can be used as the high-pressure fluid.
Here, the upper mold 101 and the lower mold 102 are respectively arranged on the front and back of the clad plate, and the regions 9ax and 9bx are expanded inside these molds to a predetermined shape. Further, by introducing a high-pressure fluid (gas, liquid, etc.) while pressurizing the introduction portion 42 from above and below with a predetermined load, each plate in the introduction portion 42 is slightly expanded to form a flow path.
Further, an unnecessary portion of the clad plate in which the hollow portion is formed is trimmed to obtain the disk 10.

The vehicle wheel 30 is configured by welding the disk 10 obtained as described above and the rim 20.
The rim 20 can be manufactured, for example, as follows. First, an aluminum stencil (JISH4000: the same as a disk) is rounded and welded to form a substantially cylindrical shape. After flaring and expanding the edge of the substantially cylindrical shape, roll forming is performed to form a drop portion 20d, a sidewall 20s, a bead sheet 20b, a rim flange 20f, etc. as shown in FIG. Shaping and adjusting to a predetermined size and shape. Then, the rim 20 is manufactured by inspecting air leakage.
In addition, when both ends of the plate material after the rim is formed into a circular pipe from the plate material are welded together, complete penetration welding is required, and FSW (friction stir welding), laser welding, GMAW (gas metal arc welding) or plasma GMAW It can be welded by a welding method such as. The above-described welding method can be appropriately selected depending on the shape of the weld joint considering the wheel diameter and the rim material thickness. In addition, when laser welding, GMAW (gas metal arc welding), or plasma GMAW is used, welding is performed by single-sided welding or double-sided welding.
In addition to the above, the rim can be manufactured by a publicly known method. That is, it is possible to cut a cylinder from an aluminum alloy seamless pipe (JISH4080) or an aluminum alloy welded pipe (JISH4090) and mold it as described above, and to cast an aluminum alloy (JISH5202: AC4C or AC4CH, etc.) It is also possible to create a substantially cylindrical shape by casting and shape it into a rim shape by spinning.

As a method of welding the disc to the rim, when the disc 10 is welded on the end surface of the rim 20 as shown in FIG. 2, the weld joint is a T-joint or a butt joint, and the groove shape is a lathe and an I-shape. A groove and a full penetration weld joint is required. Therefore, as welding in this case, welding such as FSW (friction stir welding), laser welding, GMAW (gas metal arc welding) or plasma GMAW is performed according to the mechanical requirement or weldability of the welded portion, Ensure joint strength and weld quality.
If welding is performed in a state where the disk 10 is on the end face of the rim 20 as shown in FIG. 2, a wheel (so-called full-face type wheel) in which the entire front surface of the disk 30 is exposed to the outside is obtained, and the design is improved.

  Further, when welding is performed in a state where the disc is fitted to the rim, fillet welding is required in which the end portion of the overlapped portion between the disc and the rim after fitting is used as a lap joint. Accordingly, as welding in this case, laser welding, GMAW (gas metal arc welding), plasma GMAW, or other welding method is appropriately selected and employed in accordance with the mechanical requirement of the weld or weldability.

As described above, the wheel disc (vehicle wheel) according to the first embodiment of the present invention is formed by clad joining a plurality of metal plates, and the hub mounting portion, the spoke portion, and the disc outer peripheral portion are expanded. It has an integral hollow part. For this reason, since the hub mounting portion, the spoke portion, and the outer peripheral portion of the disk protrude like the reinforcing rib and the strength is improved, the thickness of the metal plate can be reduced and the weight of the disk can be reduced. In addition, since the hub attaching portion, the spoke portion, and the outer peripheral portion of the disk are expanded and projecting, the unevenness becomes remarkable and the design can be improved.
In addition, since the disk is formed from a metal plate instead of casting, the manufacturing yield is also improved.
Further, since the hollow portion is closed by the outer peripheral edge of the outer peripheral portion of the disk and the hub mounting portion, the hollow portion is completely closed, the hollow portion can be prevented from being crushed by a load, and the strength is improved.

In addition, the present inventors use a general-purpose FEM so that the thickness of the aluminum plate for a disk used in the vehicle wheel according to the first embodiment of the present invention is as high as that of a commercially available aluminum cast wheel (16 inches). Various changes were made to estimate the degree of weight reduction. As a result, the disk part is 27.8% lighter by providing a hollow part than a commercially available cast product, and further, by using a non-cast aluminum rolled plate (stretched material), the strength is improved and material defects are reduced. As a result, the weight was reduced by 42.9% compared to the commercial casting. Overall, a significant weight reduction of about 41% is expected compared to conventional cast wheels.
In addition, the vehicle wheel according to the first embodiment of the present invention is relatively thin compared to a cast product, so that the amount of aluminum used is reduced by about 41%, and the surface property is good with a wrought material. The material loss of about 29% due to the rough surface grinding is eliminated.
Furthermore, since there are no defects such as sink marks and voids compared to casting, the defect rate can be reduced. Therefore, the manufacturing of the large-diameter wheel is facilitated, the manufacturing process can be automated, the productivity is improved, and the number of personnel can be reduced.

FIG. 5 shows an example of a metal plate used for manufacturing the disk 10b in the vehicle wheel according to the second embodiment of the present invention, and corresponds to FIG.
First, two rectangular aluminum plates 40b (only one is shown in the figure) serving as a disk are prepared. Similarly to FIG. 3, the region 6x corresponding to the hub mounting portion on the facing surface of each aluminum plate, the spoke portion. The anti-crimping agent (black part in the figure) is applied to the region 2x corresponding to 1 and the region 4x corresponding to the outer periphery of the disk. Further, an anti-crimping agent is also applied to the linear introduction portion 42b for introducing a high-pressure fluid (gas) from the region 4x corresponding to the outer peripheral portion of the disk to the outer edge of the aluminum plate 40b.
Furthermore, in the second embodiment, the anti-crimping agent is also applied to the annular region (outermost peripheral application region) 12x formed via the outer periphery of the region 4x and the gap (outer peripheral non-application region) G having a predetermined width. Since no anti-bonding agent is applied to the gap G, two aluminum plates 40b are joined when clad rolling to form an outer peripheral edge of the disk outer peripheral portion for closing the hollow portion.
Next, after suitably drying the coated portion, these are laminated so that the coated portions of the two aluminum plates 40b overlap, and the laminated plate is clad rolled (joined). Thereafter, in the same manner as in FIGS. 4B and 4C, press molding and preheating are performed, and then a high-pressure fluid is introduced into the introduction portion 42b to form a hollow portion. At this time, the upper and lower sides of the annular region 12x are held by a mold so that the annular region 12x does not swell.

Next, an example of a process of spinning the annular region 12x to integrally form the disk 10b and the rim 12 will be described with reference to FIG.
The annular region 12x is connected to the outer peripheral edge of the disk outer peripheral portion 4b and is a portion where each aluminum plate 40b is not clad-bonded because the anti-crimping agent is applied (FIG. 6A).
Here, the annular region 12x is composed of an upper annular region 12x1 and a lower annular region 12x2, and a tool 100 such as a spatula is applied to these interfaces, mandrels 150 and 151 are inserted into these inner surfaces, and the upper annular region 12x1 and the lower annular region 12x1. Spinning is performed so that the gap with the side annular region 12x2 is widened (FIG. 6B). Then, the upper annular region 12x1 and the lower annular region 12x2 are each processed along the axial direction and into a rim shape. Thus, the rim 12 integrated with the disk 10b is formed by the upper annular region 12x1 and the lower annular region 12x2 (FIG. 6C).

In this embodiment, since the anti-bonding agent is applied to the annular region 12x, the plate thickness of the upper annular region 12x1 and the lower annular region 12x2 is the same as that of the original single metal plate (aluminum plate). Can be made thinner.
However, without applying the anti-crimping agent to the annular region 12x (that is, the interval (outer periphery non-application region) G is formed so as to be connected to the outer peripheral edge of the disc outer peripheral portion 4b), Spinning may be performed by bending in the direction, and may be used when the flange 4f is formed large by bending the disk 10b on the front side. In this case, since the thickness of the annular region (corresponding to the gap G) 12x is twice that of the original single metal plate (aluminum plate), it is preferable to reduce the thickness of the rim by spinning.
The spinning process is not particularly limited as long as it is a rotational plastic process that performs plastic deformation by pressing a tool (for example, a forming roller or a spatula) while rotating the material, and a known process can be adopted.

FIG. 7 shows another example of the process of spinning the annular region 12x to integrally form the disk 10b2 and the rim 12. As shown in FIG. In the process of FIG. 6, a general wheel in which the disk 10b is connected to the drop portion of the rim 12 is formed. By changing the ratio of the length of the upper mold and the lower mold of the mandrel, the connection position of the rim and the disk is changed. Can be changed.
As shown in FIG. 7, the mandrel 150x is lengthened and the mandrel 151x is shortened to spin the annular region 12x (FIGS. 7A and 7B). When the outer flange side of the rim 12b is formed into a bead seat portion and a flange portion, and the tip of the flange portion is deleted, a wheel in which the disk 10b2 is connected to the bead seat portion of the rim 12b is obtained (so-called semi-full face type) Wheel) and design can be improved.

  The present invention is not limited to the above embodiment. For example, the shape of the spoke part and the decoration hole is not limited. Moreover, the formation area of the hollow portion is not particularly limited as long as it is in communication with a part of the internal space of each of the hub attachment portion, the spoke portion, and the disc outer peripheral portion.

1 is a perspective view showing a vehicle wheel according to a first embodiment of the present invention. It is sectional drawing which follows the II-II line of FIG. It is a figure which shows an example of the metal plate used for manufacture of the disk in the vehicle wheel which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the process of forming a hollow part from the clad board after clad rolling. It is a figure which shows an example of the metal plate used for manufacture of the disc 1 in the vehicle wheel which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the process of spinning an annular area | region and integrally forming a disk and a rim | limb. It is another figure which shows an example of the process of spinning an annular area | region and integrally forming a disk and a rim | limb.

Explanation of symbols

2 Spoke 4 Disc outer periphery 4f Disc outer periphery (outer flange)
6 Hub mounting portion 9a, 9b Hollow portion 10, 10b, 10b2 Disc 12, 12b, 20 Rim 12x Annular region (outermost peripheral coating region)
30 Vehicle wheel 40, 40b Metal plate G Interval (outer periphery non-coating area)

Claims (8)

A wheel disc formed by clad joining a plurality of metal plates, a hub attachment portion, a plurality of spoke portions extending radially from the hub attachment portion toward an outer peripheral edge of the disc, and an outer end of the spoke portion An annular disk outer periphery connected to the
The hub attachment portion, the spoke portion, and the disc outer peripheral portion include an integral hollow portion that expands at a joining interface between the metal plates, and the hollow portion includes an outer peripheral edge of the disc outer peripheral portion, the hub attachment portion, and Steel wheel disc closed with. 2. The wheel disk according to claim 1, wherein the hollow portion is formed by introducing a high-pressure fluid into a joint surface coated with a pressure-bonding inhibitor when the metal plates are clad-joined. The steel wheel for vehicles formed by welding the disk for wheels of Claim 1 or 2, and a rim | limb. A vehicle steel wheel in which the wheel disk and the rim according to claim 1 or 2 are integrally formed,
The rim is a steel wheel for vehicles formed by spinning the metal plate connected to the outer peripheral edge of the outer peripheral portion of the disk along the axial direction. Of the opposing surfaces of a plurality of metal plates to be a disk, an area corresponding to the hub mounting part of the disk, and an area corresponding to a plurality of spoke parts extending radially from the hub mounting part toward the outer peripheral edge of the disk; , An application step of applying an anti-bonding agent to a region corresponding to the outer peripheral portion of the annular disk connected to the outer end of the spoke portion;
A clad bonding step of laminating and laminating the metal plates coated with the anti-bonding agent;
A hollow portion forming step of introducing a high-pressure fluid into the coating region of the clad-bonded metal plate and expanding the coating region to integrally form the hub attachment portion, the spoke portion, and the hollow portion of the outer peripheral portion of the disk. A method of manufacturing a disk for a wheel. A method for manufacturing a steel wheel for a vehicle, wherein a rim is welded to the disc manufactured by the method for manufacturing a wheel disc according to claim 5. A method of manufacturing a steel wheel for a vehicle, in which a disk and a rim manufactured by the method for manufacturing a disk for a wheel according to claim 5 are integrally formed,
In the coating step, an outer peripheral non-coating region that does not apply the anti-bonding agent to the outer peripheral side of the surface corresponding to the annular disk outer peripheral portion of the opposing surface of the metal plate,
After manufacturing the wheel disk, the metal plate interposed in the non-peripheral uncoated region is spun to form a rim forming step for forming a rim integrated with the wheel disk. . A method of manufacturing a steel wheel for a vehicle, in which a disk and a rim manufactured by the method for manufacturing a disk for a wheel according to claim 5 are integrally formed,
In the coating step, an outer peripheral non-coating region where the anti-crimping agent is not applied is provided on the outer peripheral side of the opposite surface of the metal plate from the region corresponding to the outer peripheral portion of the annular disk, and the outer periphery of the outer peripheral non-coating region is provided. Connected to the outer periphery of the metal plate on the side to apply the anti-bonding agent to provide the outermost peripheral application region,
After manufacturing the wheel disk, a rim forming step of widening a gap between the metal plates interposed in the outermost peripheral coating region, spinning each of the metal plates, and forming a rim integral with the wheel disk A method for manufacturing a steel wheel for a vehicle, comprising:

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