JP2896482B2 - Manufacturing method of automobile wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing an automobile wheel,
In particular, the present invention relates to a method of manufacturing a two-piece wheel in which a separately manufactured rim and a disc are integrated by welding.

[0002]

2. Description of the Related Art A conventional welding two-piece wheel is shown in FIG. In this rim, the rim (1) is manufactured by forming a thin metal plate into a cylindrical shape and plastically deforming it by rolling or the like, and a disc is placed at a predetermined position on the inner peripheral surface of the rim (1).
By welding the inner peripheral portion of (2), the rim (1) and the disc (2) are integrated.

[0003] When a clear coating or a color coating is applied to the wheel, a method of applying the coating after the welding is adopted. However, in this method, the rim (1) has a complicated shape in which the disk (2) has entered into the rim (1), so that the workability is poor. Also rim
It takes time to spread the paint to details such as the outer surface of (1) and the outer surface of the disc (2). Therefore, there is a problem that productivity in the painting process is poor and productivity in the entire wheel manufacturing process is not improved.

Therefore, a method is considered in which the rim (1) and the disk (2) are separately coated in advance and then welded.
With this one, the objects to be painted have simple shapes,
The productivity in this painting process is improved. However, if this method is directly applied to the above wheel, the rim (1) and the disc (2) are not so thick, and the high heat generated at the welded portion will cause the outer peripheral surface of the rim (1) and the outer surface of the disc (2). , And the temperature of each of these surfaces tends to be the discoloration temperature of the coating. As a result, the outer peripheral surface of the rim (1) and the disk
The outer surface of (2) is discolored and the appearance of this wheel is impaired. Therefore, this method cannot be adopted as it is. [About the invention of claim 1]

[0005]

[Technical Problem] The present invention has been made in view of the above points, and has been made by "welding the inner peripheral portion of the disc (2) to the inner peripheral surface of the rim (1). Manufacturing method for automobile wheels in which the rim (1) and the disc (2) are integrated), the rim (1) and the disc (2) are painted in advance and then welded together. An object of the present invention is to improve the productivity of the wheel by preventing the outer surface of the disk (2) from being discolored.

[0006]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is as follows: "The welding portion of the rim (1) with the disk (2) is thicker than the other rim constituting walls. Annular thick part
(1a), an annular tongue piece (2a) projecting inward is provided on the periphery of the disk (2), and this annular tongue piece (2a) is fitted into the annular thick part (1a). In this fitted state, the tip of the annular tongue piece (2a) and the inner peripheral surface of the annular thick part (1a) are welded,
The thickness of the annular thick part (1a) and the axial length of the annular tongue piece (2a) are determined by the temperature of the outer peripheral surface of the rim (1) and the outer surface of the disk (2) due to heat transfer during welding. It was set to a value that did not result in a discoloration temperature ”.

[0007]

The above technical means of the present invention operates as follows. Before manufacturing this wheel,
(1) and disc (2) are separately painted. Then insert the disc (2) from outside the rim (1)
The annular tongue piece (2a) is fitted into the annular thick part (1a). Thereafter, when the inner peripheral edge of the annular tongue portion (2a) is welded to the inner peripheral surface of the annular thick portion (1a), the rim (1) and the disc (2) are integrated.

In this device, the outer peripheral surface of the rim (1) is separated from the welded portion by the thickness of the annular thick portion (1a), and the thickness of the annular thick portion (1a) is further increased. Is set to such a value that the temperature of the outer peripheral surface of the rim (1) does not reach the paint discoloration temperature due to heat transfer during welding. Therefore, at the time of the above welding,
The paint on the outer surface of the rim (1) does not burn and discolor.
Similarly, the outer surface of the disk (2) is separated from the weld by a distance corresponding to the width of the annular tongue piece (2a), and the axial length of the annular tongue piece (2a) is also set. Is set so that the temperature of the outer surface of the rim (1) and the outer surface of the disc (2) do not reach the paint discoloration temperature due to heat transfer during welding.
The coating on the outer surface of the disc (2) does not burn and discolor.

[0009]

According to the present invention having the above configuration, the following specific effects are obtained. In this case, even if the rim (1) and the disc (2) are painted in advance and then welded, the paint on the outer peripheral surface of the rim (1) and the outer surface of the disc (2) does not change color. Therefore, a method of performing welding after painting can be adopted, and productivity in the painting process is improved. As a result, the productivity of the entire wheel manufacturing process is improved.

Further, since the rim (1) and the disc (2) are separately coated in advance, it is easy to make the rim (1) and the disc (2) different colors. Furthermore, since the distance from the welded portion to the outer peripheral surface of the rim (1) and the outer surface of the disk (2) is large, there is no heat annealing part due to overheating during this welding, and work such as re-hardening after welding is performed. Becomes unnecessary. [Regarding the invention of claim 2] The invention of claim 2 is to improve the welding between the rim (1) and the disk (2) in the invention of claim 1 above. Technical measures include: `` The surfaces of the rim (1) and the disc (2) shall be pre-painted, and the tip of the annular tongue piece (2a) and the inner circumference of the annular thick part (1a) shall be And the surface were made into an annular non-painting area (S) ”.

In this device, the surfaces of the rim (1) and the disc (2) are previously coated with a predetermined coating, and the tip of the annular tongue piece (2a) and the inner peripheral surface of the annular thick portion (1a) are provided. Is a ring-shaped unpainted area (S), so that when welding these rims (1) and disc (2), the welding of the filler metal and the base metal is hindered by painting, No paint is involved. Therefore, this welding is more reliable. [Regarding the invention of claim 3] The invention of claim 3 is based on the invention described in claim 1 or 2 above.
(2a) and the annular thick portion (1a) were welded together in a press-fitted state.

In the completed state of this wheel, the annular tongue piece
Since (2a) is pressed into the annular thick portion (1a), poor centering of the disk (2) due to welding strain is unlikely to occur.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment implements the above-described inventions of claims 1 to 3, and a wheel manufactured by molding a rim (1) by forging and cutting. As shown in FIG. 2 to FIG. 4, the above-mentioned annular thick portion is continuously formed outside the well portion (11) provided substantially at the center thereof.
(1a) is provided, and the disk (2) combined with the rim (1) is connected to the above-described annular tongue piece (2a) inside the ring (24) provided on the peripheral edge thereof. It is a configuration provided. [Regarding the rim (1)] As shown in FIG. 2, the rim (1) is provided at wells (11) provided at a position slightly eccentric inward from the center thereof and at both ends of the rim (1). Outer flange (1
3) and an inner flange (15), a first peripheral wall (12) and a second peripheral wall (14) connected between the outer flange (13) and the inner flange (15) and the well portion (11). It is composed of

The first peripheral wall (12) has an annular thick portion (1a) having an inner end continuous with the outer wall of the well portion (11), and a thin wall portion provided outside the annular thick portion (1a). (16), and the outer flange (1) is provided outside the thin portion (16).
3) is smoothly continuous. Then, the annular thick portion (1
The inner peripheral surface of (a) is a fitting peripheral surface (18) having a slightly smaller diameter than that of the well portion (11), and the inner peripheral surface of the thin portion (16) is formed of the annular thick portion (1a). It has a larger diameter and a tapered surface (T) whose diameter increases outward.

Further, the thickness (L ₁ ) of the annular thick portion (1a) is
When the inner peripheral edge of the annular tongue piece (2a) of the disc (2) described later is welded to the fitting peripheral surface (18), the heat transfer of this causes the temperature of the outer peripheral surface of the rim (1) to become discolored. It is set to a value that does not reach the temperature. Further, the diameter of the fitting peripheral surface (18) is set to a predetermined size in relation to the outer diameter of the annular tongue piece (2a), and the axial length of the fitting peripheral surface (18) is Is slightly larger than the sum of the axial length (L ₂ ) of the annular tongue piece (2a) and the width of the welded portion (W) continuously applied inside the annular tongue piece (2a). It is set to some extent. In this embodiment, the thickness of the annular thick portion (1a) is 10 mm, and the axial length of the fitting peripheral surface (18) is 15 mm with respect to the rim (1) having the maximum outer diameter of 480 mm. . An annular end surface (17) is formed between the fitting peripheral surface (18) and the tapered surface (T), and has an outer diameter slightly larger than that of a ring portion (24) described later. Diameter.

The outer peripheral surface of the second peripheral wall (14) is set to have the same diameter as that of the first peripheral wall (12).
It is as thin as the outer flange (13) and the inner flange (15). Incidentally, annular humps (H) and (H) are provided in the middle of the outer peripheral surface of the first peripheral wall (12) and at the outer end of the outer peripheral surface of the second peripheral wall (14). H) The space between the outer flange (13) and the inner flange (15) is a bead seat.

Further, the rim (1) having the above structure is finished by forging and cutting a ring-shaped workpiece (M) made of an aluminum alloy as shown in FIG. That is, an annular clamp piece protruding from the inner peripheral side of the workpiece (M).
(C) is held by a pair of opposing molds while being held and rotated, and a pressing roller is pressed from the side of these molds to form a rim cross section. Thereafter, when the clamp piece (C) is cut off by cutting (cut at a portion indicated by a dotted line in FIG. 6), the rim (1) is finished. In addition, the fitting peripheral surface (1
8) is formed by this cutting process, so that its dimensional accuracy is higher than when the fitting peripheral surface (18) is finished only by forging.

After the above processing, the tapered surface (T) of the rim (1)
The outer surface of the outer flange (13) and the outer surface of the rim (1) are color-painted, and the outer surface of the rim (1) is coated with clear paint. The inner side of the mating peripheral surface (18) is a rim-side unpainted area (S ₁ ) where this coating is not applied, and this is the unpainted area described above.
(S). [Regarding Disc (2)] The disc (2) combined with the rim (1) is made of the same aluminum alloy as the rim (1). As shown in the figure, a central hub (22), four spokes (23) (23) projecting radially from the outer end thereof and gently curving inward toward the tip end, and these spokes
(23) A ring part (24) connected so as to connect the tips of (23)
And an annular tongue piece (2) protruding inside the ring (24).
a). The outer diameter of the annular tongue portion (2a) is set smaller than that of the ring portion (24), and is set to have a dimensional relationship of being press-fitted into the fitting peripheral surface (18). That is, it is about the interference fit specified in JIS.
The axial length (L ₂ ) of the annular tongue piece (2a) is such that when the inner peripheral edge thereof is welded, the heat transfer of the inner tongue causes the temperature of the outer surface of the disk (2) to become discolored. The temperature is set to a value that does not reach the temperature, and is 8 mm in this embodiment. The inner end surface (24a) of the ring portion (24) is a contact portion with the annular end surface (17).

The hub (22) of the disk (2),
The outer surfaces of the spokes (23) and (23) and the ring portion (24) are coated with the same color as the tapered surface (T), and the other portions are coated with clear paint. On the outer peripheral surface and the inner end surface of the annular tongue piece (2a), a disc-side unpainted area (S ₂ ) on which the coating is not applied is formed, and this becomes the above-mentioned unpainted area (S). [Regarding the actual welding of the rim (1) and the disc (2)] In manufacturing the wheel having the above configuration, first, the disc (2) is inserted from the outside of the rim (1). At this time,
Since the annular tongue piece (2a) of (2) and the fitting peripheral surface (18) of the rim (1) are set to the above-mentioned dimensional relationship, the annular tongue piece (2a) is fitted to the fitting peripheral surface (18). ). Then, when the inner end surface (24a) of the ring portion (24) is brought into contact with the annular end surface (17) of the rim (1), the annular tongue piece (2a) is positioned within the fitting peripheral surface (18) and It is temporarily stopped. Thereafter, when the inner end surface of the annular tongue piece (2a) and the fitting peripheral surface (18) are welded to the entire circumference in a manner along these, the rim (1) and the disk (2) are integrated. .

In this case, since the outer peripheral surface of the rim (1) is separated from the fitting peripheral surface (18) by the above-mentioned thickness (L ₁ ), the coating on the outer peripheral surface may be discolored by burning. Absent. Similarly, the outer surface of the disc (2), since that is from the inner periphery of the annular tongue portion (2a) above a length (L ₂₎ minutes apart, never have painted the external surface discolored burnt . During the welding, the outer peripheral surface of the rim (1) became 180 ° C. and the outer surface of the disk (2) became 200 ° C., all of which became lower than the discoloration temperature of the coating.

The rim (1) and the disc (2) are formed with the rim-side non-coating area (S ₁ ) and the disc-side non-coating area (S ₂ ). The welding between the metal and the base material is not hindered by the coating, and the coating material is not involved in the weld metal. Further, the rim side non-coating area (S ₁ )
Is the electrode grounding part during welding. Further, since the annular tongue piece (2a) is press-fitted into the annular thick part (1a) in a tight fit, the rigidity of the wheel is improved.

In this embodiment, the rim (1) is manufactured by forging and cutting, but it may be manufactured by casting. Further, in this embodiment, the fitting between the annular tongue piece (2a) and the annular thick part (1a) is the above-mentioned interference fit, but is not limited to this.
For example, an intermediate fit may be used.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a wheel in a conventional example.

FIG. 2 is a cross-sectional view of a wheel manufactured by the method according to the embodiment of the present invention.

FIG. 3 is a front view of this.

FIG. 4 is a rear view of the disk (2).

FIG. 5 is a perspective view of a workpiece (M).

FIG. 6 is a cross-sectional view of a main part in a state where the forging is completed.

[Explanation of symbols]

 (1) ・ ・ ・ Rim (2) ・ ・ ・ Disk (1a) ・ ・ ・ Circular thick part (2a) ・ ・ ・ Circular tongue piece (S) ・ ・ ・ Unpainted area

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60B 3/04 B60B 23/00

Claims (3)

(57) [Claims] The rim (1) and the disk are welded to the inner peripheral surface of the rim (1) by welding the inner peripheral edge of the disk (2).
(2) in a method for manufacturing an automotive wheel, wherein the welded portion of the rim (1) with the disk (2) is formed by an annular thick portion ( 1a), an annular tongue piece (2a) projecting inward is provided on the periphery of the disc (2), and this annular tongue piece (2a) is fitted into the annular thick part (1a). And the annular tongue piece (2a) in this fitted state
Of the annular thick part (1a) and the axial length of the annular tongue piece (2a) are determined by the heat during welding. Outer peripheral surface of rim (1) and disk due to movement
(2) A method for manufacturing an automotive wheel, wherein the temperature of the outer surface is set to a value that does not cause the paint discoloration temperature. 2. The surface of the rim (1) and the disk (2) are preliminarily painted, and the tip of the annular tongue piece (2a) and the inner peripheral surface of the annular thick part (1a) are provided. 2. The method of manufacturing an automobile wheel according to claim 1, wherein the first and second parts are annular uncoated areas (S). 3. The method for manufacturing a vehicle wheel according to claim 1, wherein the fitting state at the time of welding the annular tongue piece (2a) and the annular thick part (1a) is a press fit state.