JPH04200966A - Die structure of wheel for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a vehicle wheel having a plurality of holes (= f holes) in the center by low pressure casting in which molten metal is injected using gas pressure such as air. Regarding the mold structure for molding.

(Prior art) Conventionally, this type of mold is disclosed in Japanese Patent Application Laid-Open No. 2-4, +75.
[From Publication No. 1i, it is known that a mold is provided with a sprue that communicates with a cavity in the mold, and in this mold, the sprue is provided outside of a portion that matches the rim of the cavity.

(Problems to be Solved by the Invention) In the conventional method described above, the molten metal is injected into the cavity in the mold from one sprue located outside the part that matches the rim of the cavity. Number (= I hole that matches the I hole) In the hole opening part farthest from the sprue, the water circulation is delayed compared to the part near the sprue, and the disc part with the wheel mounting hole becomes uneven. As a result, the quality of the area near the mounting hole of the wheel disc portion, which requires relative rigidity, deteriorates.

An object of the present invention is to provide a mold structure that improves the quality of the disc portion of a wheel and makes it possible to mold a highly rigid wheel.

(Means for Solving the Problems) In order to achieve the second object, the present invention as claimed in claim 1 provides a mold for molding a vehicle wheel having a plurality of mounting holes around the center part, the mold In the case where a sprue is provided that communicates with a cavity in the mold, on a line extending outward from a portion of the cavity that coincides with the center of the wheel through a mounting hole opening that coincides with each of the mounting holes of the cavity. In addition, a plurality of sprues were provided so as to correspond to the respective mounting hole openings, and were located outside of the portion that matched with the rim portion of the cavity.

(Function) The sprue is located on a line extending outward from the part of the cavity in the mold that matches the center of the wheel through the openings of each mounting hole of the cavity, and outside of the part that matches the rim of the cavity. Since a plurality of holes are provided corresponding to the Natori τ1 hole openings, the molten metal flows from each sprue toward each mounting hole opening of the cavity, and therefore the molten metal is injected into each mounting hole opening of the cavity almost simultaneously. This eliminates the delay in water circulation and improves the quality of the wheel disc.

In this case, as in the invention of claim 2, by forming a recess in the riser layer at a portion that matches the center of the wheel of the cavity in the mold, the molten metal flowing toward each mounting hole will flow into the recess. Therefore, the circulation of the hot water in the number (=1 hole) area is improved, and furthermore, the occurrence of shrinkage cavities in the disk portion with a complicated shape can be effectively prevented.

(Example) In the drawing, (1) shows a mold for forming a vehicle wheel having four mounting holes in the center, and the mold (1) has a lower mold (2).
), an upper mold (3) that can be raised and lowered, and a plurality of sliding molds (4) that can be moved horizontally, and a sprue (6) that communicates with the cavity (5) in the mold (1). on a line extending outward from the portion of the cavity (5) that matches the center of the wheel through the mounting hole openings (5a) that match the respective mounting holes of the cavity (5); ), and a plurality of molds are provided corresponding to each of the mounting hole openings (5a), and furthermore, a portion that matches the center of the wheel of the cavity (5) of the mold (1). A concave portion (7) of the riser layer was formed.

A molten aluminum holding furnace (8) is provided below the mold (1), and a hot water supply pipe (9) is inserted into the molten metal of the holding furnace (8).
) into the upper branch pipe (9a) of the hot water supply pipe (9).
) are connected to each said sprue (6), thus said holding furnace (8
), air pressure is applied to push up the molten metal, and the molten metal is injected into the cavity (5) from each sprue (6) via the hot water supply pipe (9).

In the drawing, (10) is the cooling metal installed in the appropriate position of the lower mold (2), (
10a) is a water pipe buried in the chiller (10), (11)
(11) indicates a chiller installed at a proper position on the upper mold (3), and (lla) indicates an air cooling pipe embedded in the chiller (11).

In the illustrated example, the portion of the upper mold (3) forming the recess (7) is configured as a nesting mold (3a), and the nesting mold (3a)
A gap (J2) is provided between the outer periphery of the wheel and the mold (3), so that the disc part of the wheel can be cooled quickly and the nested mold (3a) can be suppressed from being cooled, thereby creating an effective riser. I made it possible to get the effect.

In addition, as shown in Fig. 4, between the window parts of the wheel, a rib A extending radially from the disc part toward the rim part is connected to a line X extending outward from the center of the wheel through the mounting hole opening part B. By arranging it so that it matches the above, the swirl flow to the disc part of the wheel becomes better, and the quality of the disc part of the wheel improves.

(Effects of the Invention) As described above, according to the invention of claim 1, the molten metal flows from the plurality of sprues on the outside of the portion that matches the rim portion of the cavity toward the openings of each mounting hole of the cavity. Become,
It has the effect of eliminating the delay in hot water flow near each mounting hole of the wheel, allowing the molding of high-quality wheels.
According to the second aspect of the invention, the water circulation in the disk portion of the wheel is improved, and the occurrence of shrinkage cavities can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of essential parts showing an example of the device of the present invention, Fig. 2 is a plan view of a wheel formed by the device of the present invention, Fig. 3 is a cross-sectional view of the wheel formed by the device of the present invention, and Fig. 4 is a cross-sectional view of the wheel. FIG. 7 is a plan view of a wheel formed by an apparatus according to another embodiment. (1)... Mold (5)... Cavity (5a)... Mounting hole opening (6)... Sprue (7)... Recessed part

Claims (1)

[Scope of Claims] 1. A mold for molding a vehicle wheel having a plurality of mounting holes around the center, the mold being provided with a sprue communicating with a cavity in the mold, wherein the cavity on a line extending outward from the portion that matches the center of the wheel of the cavity through the mounting hole openings that match the respective mounting holes of the cavity, and on the outside of the portion that matches the rim portion of the cavity; A mold structure for a vehicle wheel, characterized in that a plurality of sprues are provided corresponding to each of the mounting hole openings. 2. The mold structure for a vehicle wheel according to claim 1, wherein a recess for a riser is formed in a portion of the cavity in the mold that corresponds to the center of the wheel.