JPH0655235A - Manufacture of integrated type wheel - Google Patents

Abstract

PURPOSE:To manufacture an integratedly formed wheel by executing the spinning of a well part of a wheel stock having a cast linear rim. CONSTITUTION:A stock 9 of a IPC (integrated forming) wheel having an approximately linear rim 5 and no well part 6 is manufactured by casting. When the thickness of a part 6a which is made the well part 6 is set (t) mm, the plate thickness of a seat part 8 is set to be 2t mm, and the seat part 8 is formed to be thicker. Then, this stock 9 is set to a mandrel 10 where a rim forming surface 10a and a well part forming surface 10b are formed, the roughing and the finishing are executed by a machining roller 11, the part 6a is pressed and bent to form the well part 6. This constitution allows an integratedly formed wheel without excess thickness of the seat part 8 to be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an integral type wheel used for an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, a wheel integrally made of a light alloy such as an aluminum alloy and a magnesium alloy (hereinafter referred to as 1P
The structure of (C wheel) is as shown in FIG. 4, and the manufacturing method is as shown in FIG. 5 in the mold cavity 4 formed by the lower mold 1, the horizontal molds 2, 2 and the upper mold 3. It was a method of casting by pouring molten metal into.

[0003]

Due to the structure of the mold, the 1PC wheel molded by the above conventional casting method has a gap between the well portion 6 and the disk 7 in the rim 5 as shown by the chain line in FIG. The seat portion 8 has a surplus portion 8a.

The extra thickness portion 8a increases the weight of the 1PC wheel, which not only leads to an increase in fuel consumption, but also
Casting defects are likely to occur in the extra thickness portion 8a, which causes a problem of strength reduction and poor airtightness.

Therefore, an object of the present invention is to provide a method for manufacturing a 1PC wheel which can solve the above problems.

[0006]

In order to solve the above-mentioned problems, the present invention casts a wheel material having a substantially straight rim without a well portion, and then bends the well portion by spinning. It is characterized by doing.

[0007]

EXAMPLE An example of the present invention will be described below with reference to FIG. First, as shown in FIG. 1A, a material 9 for a 1PC wheel having a substantially straight rim 5 without a well portion 6 shown by a chain line is manufactured by casting. In the figure, 7 indicates a disk. When the plate thickness of the portion 6a serving as the well portion 6 is tmm, the plate thickness of the sheet portion 8 is set to 2tmm, and the sheet portion 8 is molded thickly.

Such a material 9 is molded by pouring a molten metal into a mold cavity 4a formed by a lower mold 1a, horizontal molds 2a, 2a and an upper mold 3a as shown in FIG. Next, the material 9 is set on the mandrel 10 having the rim molding surface 10a and the well portion molding surface 10b as shown in FIG.

In this set state, as shown in FIG. 1 (c), roughing and finishing are performed by spinning with the processing roller 11, and the portion 6a is subjected to the mandrel 1
The well portion 6 is formed by pushing and bending along the well portion molding surface 10b at 0. At this time, as described above,
By forming the seat portion 8 thick, it is possible to prevent the seat portion 8 from being bent during the spinning process.

The mandrel 10 of the embodiment shown in the drawing is
Although the inner end is up to the well portion 6, if the split mandrel is inserted along the inner surface of the sheet portion 8 and the spinning process is performed, the well portion 6 can be accurately formed.

After the spinning process, the molded product is removed from the mandrel 10 to form a 1PC wheel having a space portion 8b having no extra thickness inside the seat portion 8 as shown in FIG.

[0012]

As described above, according to the present invention, it is possible to form a 1PC wheel without a surplus portion in the seat portion, and to reduce the weight as compared with the conventional one having a surplus portion. It is possible to provide a high-strength wheel that can reduce fuel consumption and has few casting defects.

[Brief description of drawings]

1 shows an embodiment of the present invention, (a) is a view showing a cross-sectional shape of a wheel material after casting, (b) is a cross-sectional view of the wheel set on a mandrel, (c)
[Fig. 3] is a cross-sectional view showing a spinning processing state, each showing a half surface of the wheel.

FIG. 2 is a sectional view showing a mold for casting the wheel of the present invention.

FIG. 3 shows a half-face in a cross-sectional view of a wheel formed by the method of the present invention.

FIG. 4 is a cross-sectional view showing a conventional wheel, showing a half surface thereof.

FIG. 5 is a sectional view showing a conventional mold.

[Explanation of symbols]

 5 Rim 6 Well 9 Wheel material

Claims (1)

[Claims] 1. A method for manufacturing an integrated wheel, comprising casting a wheel material having a substantially straight rim without a well portion, and then bending the well portion by spinning.