JPH091315A - Method for casting wheel for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and simply set a core and to improve a molding work efficiency by embedding a core supporting member projecting at a space forming position of spoke part in the core, at the time of casting an aluminum-made hollow spoke vehicle wheel. SOLUTION: A mold 50 is constituted of a lower mold 51, upper mold 52, side molds 53 and shell cores 70. In the part 72 of the core 70 for forming the hollow of a spoke, the bar-like supporting member 4 extended in the width direction and projecting both ends 45, 46, is embedded, and core print 711 arranged at a hub forming part 71 of the core 70 is insert-fitted into the core supporting hole 511 of the lower mold 51 and brought into contact with the inner wall surfaces of the lower and the upper molds 51, 52 at the time of joining the molds to secure a specific clearance for forming a spoke. Further, the contact parts 512, 522 of the inner surfaces of the lower and the upper molds 51, 52 with projecting tip parts 45, 46 of the core supporting member 4 are formed in a recessed shape for preventing the shifting of the core 70. Then, the bar-like core supporting member 4 is made of aluminum the same as the casting wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for casting a vehicle wheel having hollow spokes.

[0002]

2. Description of the Related Art When casting a vehicle wheel of this type, for example, a shell core must be arranged in a spoke molding space in a mold.

For this reason, in the prior art, a shell core is arranged in the molding space of the spoke portion of the mold via a keren, or a protrusion is provided on the core or the mold and the protrusion is used. The shell core was placed in the spoke molding space of the mold.

[0004]

However, in the former case, since the keren is a separate body from the core, it is difficult to place it properly and it takes time to place it, resulting in an improvement in the efficiency of casting work. Has the inconvenience of being difficult to

In the latter case, since holes are formed in the wall of the product, that is, the cast spokes, it is necessary to prevent mud from entering the axles. A wall has to be installed, and as a result, it is difficult to improve the casting efficiency of the wheel.

An object of the present invention is to provide a method for casting a vehicle wheel that eliminates these disadvantages.

[0007]

In order to achieve the above object, in the method for casting a vehicle wheel according to the present invention, a support member is provided on the core and projections are provided at both ends of the support member. After that, the core is fixed to the wall of the spoke forming space in the wheel casting space through the protrusion, and then the molten metal is poured into the wheel casting space.

[0008]

Since the method for casting a vehicle wheel according to the present invention is configured as described above, the core can be properly and easily arranged in the spoke portion forming space, and a hole is formed in the wall portion of the cast spoke portion. It does not open.

[0009]

1 is a sectional view of a vehicle wheel according to the present invention, FIG. 2 is an enlarged view of a portion II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.

1 to 3, W is a cast motorcycle wheel made of an aluminum alloy, and 1 is a hub portion of the wheel W. Further, 2, 2, ... Are hollow spokes, and extend radially from the hub 1. Numeral 3 is a rim portion, which is integrally formed at the tip of the spoke portions 2, 2, ....

Reference numeral 4 denotes a rod-shaped support member, which is arranged in the width direction of the hollow spoke portion 2, and both ends thereof are cast in the wall portion of the spoke portion 2. The rod-shaped support member 4 is made of aluminum, which is the same as the material of the wheel W. Further, raised portions 21, 21, 22, 22 are formed around the rod-shaped support member 4 inside and outside the wall of the spoke portion 2 to firmly support the rod-shaped support member 2. Although the rod-shaped support member 4 has the concave groove 41 at the substantially central portion thereof, a spiral groove may be formed instead of the concave groove 41. The operation of the concave groove 41 and the spiral groove will be described later.

Next, FIG. 4 is a sectional view of a casting apparatus for carrying out the method for casting a vehicle wheel according to the present invention, and FIG.
4 is a sectional view taken along line VV in FIG. 4, FIG. 6 is an enlarged view of a VI portion in FIG. 4, and FIG. 7 is a sectional view taken along line VII-VII in FIG.

In FIGS. 4 to 7, reference numeral 50 denotes a vehicle wheel mold device, which is composed of a lower mold 51, an upper mold 52, and horizontal molds 53, 53. The casting apparatus 50 has a casting space 60, and the casting space 60 includes a hub molding space 61 and a spoke molding space.
62 and a rim portion molding space 63.

Reference numeral 511 is a support hole, which is formed at the center of the lower mold 51. The cross section of the support hole 511 has a notched circular shape.

Next, reference numeral 70 denotes a shell core, which is arranged in the hub portion molding space 61 and the spoke portion molding space 62. The core 70 includes a hub hollow forming portion 71 and a spoke hollow forming portion 72. 711 is a hollow forming part of the hub
It is a skirting board of the core 70 protruding from 71, and is inserted into the support hole 511 of the lower mold 51. In this case, since the cross-section of the skirting board 71 has a notched circular shape, it can be positioned at a position determined when the skirting board 71 is fitted into the support hole 511 (FIG. 5).
See).

521 is a sprue formed on the upper die 52.

Next, in FIGS. 6 and 7, reference numeral 4 denotes a rod-shaped support member, which is embedded in the spoke hollow forming portion 72 of the core 70. The rod-shaped support member 4 extends in the width direction of the spoke hollow forming portion 72 and both ends thereof project.
The protrusions 45 and 46 are in contact with the inner wall surfaces of the lower mold 51 and the upper mold 52 that form the spoke portion molding space 62. The contact portions 512, 522 and the peripheral portions 721, 721 of the rod-shaped support member 4 in the spoke hollow forming portion 72 are formed in a concave shape. This is for forming the raised portions 21, 22 of the vehicle wheel W described above.
Further, the concave groove 41 and the spiral groove (not shown) of the rod-shaped support member 4 are for preventing the rod-shaped support member 4 from sliding in the longitudinal direction when the rod-shaped support member 4 is installed in the spoke hollow forming portion 72. If the tips of the projecting portions 45, 46 of the support member 4 are formed in a tapered shape (only the contact portion 45 is tapered in the figure), the positioning can be easily performed along the tapered surface of the tapered concave contact portions 512, 522. It is a thing. However, it is not always necessary to form it in a tapered shape.

In the thus arranged casting apparatus, when the molten metal is poured from the spout 521, the molten metal is solidified, the mold is removed, and the core 70 is broken, the vehicle wheel W is cast. .

Instead of the rod-shaped support member 4, it is also possible to use an annular support member 8 having protrusions 45 and 46 on both sides of an annular body 80 as shown in FIGS.

[0020]

In the method for casting a vehicle wheel according to the present invention, a support member is installed on the core and projections are provided at both ends of the support member, and then the core is wheeled through the projection. Since it was fixed to the spoke part molding space wall in the casting space and then poured into the wheel casting space, the core can be properly and easily arranged in the spoke part molding space and on the wall of the cast spoke part. There is no perforation.

Therefore, by using this method for casting a vehicle wheel, the core can be easily arranged and the post-treatment after casting is unnecessary, so that the casting efficiency of the vehicle wheel can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vehicle wheel according to the present invention.

FIG. 2 is an enlarged view of a II portion in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a cross-sectional view of a casting apparatus for carrying out the vehicle wheel casting method according to the present invention.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is an enlarged view of a VI portion in FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a diagram of another embodiment corresponding to FIG.

9 is a diagram of another embodiment corresponding to FIG. 7. FIG.

[Explanation of symbols]

 2 ... Hollow spoke part 4 ... Rod-shaped support member (support member) 45,46 ... Projection part (support member) 60 ... Wheel casting space 62 ... Spoke part molding space 70 ... Shell core (core) 8 ... Annular support member (Support member) W ... Wheel for vehicle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B60B 3/06 B60B 3/06

Claims (1)

[Claims] 1. A support member is installed on a core, and projections are provided at both ends of the support member. Then, the core is fixed to the spoke space in the wheel casting space through the projections. Then, a method for casting a vehicle wheel is characterized by pouring the molten metal into the wheel casting space.