JPH01289701A - Manufacture of three piece wheel - Google Patents

Abstract

PURPOSE:To prevent a film formed by surface treatment from being damaged by spatters generated at welding by giving surface treatment on both outer and inner rims after fastening them by welding, shrink fitting them into a disk and tightening them with bolts. CONSTITUTION:A disk 11 is formed by arranging a hub mount 12 which is tightened on an axle with a bolt at an axle center, an annular step 13 to fix a rim on its outer periphery and many bolt holes 14 which penetrate in the direction of the thickness of the step on the large diameter section of the step 13. On the other hand, an outer rim 15 and an inner rim 16 are formed by providing mutually facing bolt holes 14 and 17 on the outer periphery of disk members 15a and 16a, respectively. And, the outer rim 15 and the inner rim 16 are welded together back to back, and alumite film is formed on them by surface treatment. Then, the outer periphery of the small diameter section of the stage 13 is shrink-fitted onto the inner peripheries of respective mounting flanges which are formed by punching out core sections of respective disk members, 15a and 16a, and then respective mounting flanges and the large diameter section of the step 13 are tightened together with bolts from their axial directions.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a one-piece wheel, in which a disc, an outer rim, and an inner rim are each formed separately, and these rims are integrally combined to form a wheel. It is something.

(Prior Art) As a conventional art, there is one shown in FIGS. 10 to 17.

First, a disk-shaped disk 1 made of an aluminum alloy material is formed by casting and machining, as shown in No. 10.

This disc 1 has a hub attachment part 2 that is bolted to the axle at the center of the shaft, and an annular step part 3 that attaches the rim to the outer periphery.
The large diameter portion of the stepped portion 3 has a large number of bolt holes 4 penetrating in the thickness direction at a predetermined pitch in the circumferential direction.

In addition, the outer peripheries of a pair of disc members made of aluminum alloy material are each drawn in the axial and radial directions using a spinning machine (A), so that the axially - A cylindrical outer rim 5 and an inner rim 6 having disk portions 5a and 6a at their ends are formed.

Next, as shown in FIGS. 13 and 14, the disk portions 5a and 6a of each of the outer rim 5 and the inner rim 6 are cut into inner cores using a press (A) (or a cutting machine), so that the inner diameter of the stepped portion of the disk 1 is reduced. Slightly larger diameter than the small diameter side outer diameter of 3.
Further, the mounting in which bolt holes 7, 7 corresponding to the bolt holes 4 of the step portion 3 are formed on the circumference forms flanges 5b, 6b.

Next, as shown in FIG. 15, each outer rim 5 and inner rim 6 are surface-treated to form an alumite film, and then, as shown in FIGS. Grind the outer circumferences 5C and 6C of the joint and peel off the alumite film on these parts.

Next, as shown in FIG. 17, the outer rim 5 and the inner rim 6 are placed back to back and attached to the flanges 5b and 6.
The inner periphery of b is fitted into the small diameter part of the stepped part 3'' of the disc 1, and the bolts 8 are inserted into each of the bolt holes 4, 7 and 7 to tighten and fix the king.

There is a method for manufacturing a three-piece wheel in which the outer rims 5C and 6C of the joints are then welded 9 to integrally fix the outer rim 5 and the inner rim 6, and then the bolts 8 are tightened again.

(Problem to be Solved by the Invention) In the above-mentioned conventional device, after the outer rim 5 and the inner rim 6 are surface-treated, they are fixed to the disk 1 by tightening bolts 8, and the outer peripheries 5C and 6C of the joint are welded. Therefore, if the alumite film near the welded part is burned out by welding heat or spatter generated during welding, or if the alumite film on the outer periphery of the joint part 5c and 60 is not completely peeled off, the welding in this part may become stuck. There was a drawback that the quality deteriorated due to insufficient quality.

Further, since the disk 1 and each of the outer rim 5 and the inner rim 6 were connected only by tightening bolts 8, it was difficult to increase the bonding strength between the two.

Furthermore, the initially tightened bolt 8 loosens due to distortion of the rim due to heat during welding, so it is necessary to tighten the bolt 8 again after welding, which is a disadvantage that the head of the bolt 8 may be damaged by repeated tightening. was there.

The object of the present invention is to provide a method for manufacturing a three-piece wheel that eliminates the above-mentioned drawbacks by welding and fixing an outer rim and an inner rim, surface-treating both, shrink-fitting them onto a disc, and then tightening bolts. .

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, a disk-shaped disk and an annular attachment bent in the axial direction at one end in the axial direction are provided with a cylindrical outer rim and an inner rim with flanges formed thereon, and an annular stepped portion is formed on the outer periphery of the disk. However, when attaching the outer rim and inner rim, the inner diameter of the flange is made slightly smaller than the outer diameter of the small diameter side of the stepped portion of the disc, and when attaching the outer rim and inner rim, the flange is brought into contact with each other back to back, and both Each installation is fixed by welding at the outer periphery of the flange.
Then, after surface treatment of the outer and inner rims, each attachment is performed by shrink fitting the inner periphery of the flange to the outer periphery of the smaller diameter side of the stepped portion of the disk, and then each attachment is axially fitted between the flange and the larger diameter portion of the stepped portion of the disk. It is designed to be bolted together.

(Function) Since the present invention has the above structure, the surface treatment of the outer rim and the inner rim is performed after the two are welded and fixed, so that the film formed by the surface treatment is free from welding heat or generated during welding. No longer damaged by spatter.

Moreover, since the disk, outer rim, and inner rim are fixed by shrink fitting and bolting, the bonding strength between the two is increased.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, as shown in FIG. 1, a circular disk 11 made of an aluminum alloy material is formed. This disc 1
1 has a hub mounting part 12 which is bolted to the axle at the center of the shaft by casting and machining, similar to the disc 1 shown in FIG.

An annular step 13 for attaching the rim to the outer periphery, and step 1
A large number of bolt holes 14 are formed in the large diameter portion of No. 3 at predetermined pitches in the circumferential direction, each passing through in the thickness direction.

Further, as shown in FIGS. 2 and 3, an outer rim 15 and an inner rim 16 made of an aluminum alloy material are also included.
form. This outer rim 15 and inner rim 16
The outer periphery of the disc member is drawn in the axial and radial directions using a spinning machine (A) to form the rim outer periphery, and the bolt holes on the disc 11 side are formed on the outer periphery of the disc parts 15a and 16a at the shaft center. 14 and corresponding bolt holes 17, 17 are formed, respectively.

Next, as shown in FIG. 4, the outer rim 15 and the inner rim 16 are placed back to back and temporarily tightened with bolts 18, and the two are welded 19 at the outer periphery of the joint to be fixed together.

Next, after cutting the welded portion 19 smoothly, as shown in FIG. 5, the axial center portions of the disc portions 15a and 16a of the integrated outer rim 15 and inner rim 16 are blanked out using a press machine (A). (or by cutting) to form flanges 15b and 16b whose inner diameter is slightly smaller than the outer diameter on the small diameter side of the stepped portion 13 of the disk 11.

Next, as shown in FIG. 6, each outer rim 15 and inner rim 16 are surface-treated to form an alumite film.

Next, as shown in FIG. 7, the outer rim 15 and the inner rim 16 are attached by heating the flanges 15b and 16b with heaters to expand their inner diameters to a larger diameter, as shown in FIG. As shown in FIG.
In other words, it is baked.

Next, as shown in FIG. 9, the stepped portion 13 of the disk 11 is
For installation, bolts 18 are inserted into bolt holes 14, 17, and 17 formed on the periphery of the flanges 5b and 6b, and the king is tightened and fixed.

(Effects of the Invention) As is clear from the above description, the present invention involves surface-treating the outer rim and the inner rim after welding and fixing them together.
Since this is shrink-fitted and bolted to the disc, the coating on the outer rim and inner rim formed by surface treatment will not be damaged by welding heat or spatter generated during welding, and the connection between the disc and the outer rim and inner rim will be improved. It has the effect of increasing strength.

[Brief explanation of the drawing]

1 to 9 are process diagrams showing the manufacturing process of a three-piece wheel according to an embodiment of the present invention, and FIGS. 10 to 17 are process diagrams showing the manufacturing process of a three-piece wheel according to a conventional example. 11: Disc, 12: Hub mounting part, 13: Step part, 1
4: Bolt hole, 15: Outer rim, 15a: Disc part, 1
5b: Flange mounting, 16: Inner rim, 16a:
Disc part, 16b: Mounted on flange, 17: Bolt hole, 1
8: Bolt, 19: Welding. Application agent Hisashi Matsumoto 1 Figure 4 Figure 2 Figure 3 Figure 5 Figure 5b Figure 6 Figure S Figure 7 Figure 9

Claims (1)

[Claims] 1. A disc-shaped disc, a cylindrical outer rim and an inner rim each having an annular mounting flange bent in the axial direction at one end in the axial direction are provided, and an annular stepped portion is formed on the outer periphery of the disc. , the inner diameters of the mounting flanges of the outer rim and inner rim are formed to be slightly smaller than the outer diameter of the small diameter side of the stepped portion of the disc, and the outer rim and inner rim are brought into contact with each other back to back at their mounting flange portions, and both are mounted individually. After welding and fixing the outer periphery of the flange, and then surface-treating the outer rim and inner rim, the inner periphery of each mounting flange is shrink-fitted to the outer periphery of the small diameter side of the stepped portion of the disk, and then the mounting flange and the stepped portion of the disk are A method for manufacturing a three-piece wheel characterized by bolting the large diameter part from the axial direction.