JPH0321258B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a mold for a vehicle wheel.

[Conventional technology]

In conventional molds for vehicle wheels, a vehicle wheel-shaped casting space is formed in the mold body, a feeder space is communicated with this casting space, and a sprue is opened in the feeder space. Molten metal was poured into the casting space through the hot water space.

[Problem that the invention seeks to solve]

However, in such conventional vehicle wheel molds, the feeder space is formed on the side of the casting space, so the molten metal flows from the side of the casting space (rim forming casting space) into the casting space. It penetrates into the body. For this reason, the solidification rate of the molten metal in the rim-forming casting space differs significantly, resulting in the disadvantage that a large amount of residual stress is generated in the rim portion of the vehicle wheel to be cast.

An object of the present invention is to eliminate the above-mentioned disadvantages.

[Means to solve the problem]

In order to achieve the above object, in the mold for a vehicle wheel according to the present invention, a mold body is provided with a casting space, a riser space, and a sprue hole, and the casting space is formed into a hub disposed at its axial center. It is composed of a space part, a disc part molding space part arranged around the hub forming space part, and a rim part molding space part arranged around the disc part molding space part, A hot water space is communicated with the feeder space, the feeder space is extended upward along the axis of the hub forming space, and the sprue hole is provided in the upper part of the feeder space, and a wheel axle hole is provided in the hub forming space. In a mold for a vehicle wheel, in which a forming insert is installed and a cylindrical strainer is inserted into the feeder space through an annular space around the feeder space, a hemispherical protrusion is provided at the upper end of the axle hole forming insert. and in forming the annular space, the relationship between the inner diameter B of the sprue hole and the outer diameter A of the strainer is 0.8≦A/B<1, and in forming the strainer, Warm,
A cylindrical body having a required number of through holes formed on its side surface is filled with a fibrous material, and placed on the strainer with the lower part of the cylindrical body being fitted onto the hemispherical protrusion.

[Action of the invention]

Since the mold for a vehicle wheel according to the present invention is constructed as described above, the molten metal that has entered the cylinder of the strainer in the feeder space is filtered while passing through the hemispherical protrusion of the insert for forming the axle hole of the wheel. After that, it flows radially along the hemispherical protrusion, and then flows radially into the casting space through the through hole in the side surface of the cylinder. Therefore, the molten metal becomes a laminar flow, reaches the rim forming space at approximately the same speed, and is solidified at approximately the same speed.

[Explanation of Examples]

In FIG. 1, 2 is a mold body (mold), which is composed of a lower mold 21, horizontal molds 22, 22, and an upper mold 23. Reference numeral 211 denotes an insert for forming a wheel axle hole, and is installed in the lower die 21.
A hemispherical protrusion 21 is provided at the upper end of this insert 211.
2 is formed. 3 is a casting space of the mold body 2. This casting space 3 is formed in the shape of a vehicle wheel, and is composed of a hub forming space 31, a disk forming space 32, and a rim forming space 33.

An upper feeder space 41 extends upward along the axis of the mold body 2 (of the hub forming space 31) and opens into the hub forming space 31. The upper end opening 411 of this upper feeder space 41 opens on the upper surface of the upper mold 23, and is called the "gate hole" of the present invention.
functions as Reference numeral 11 denotes a strainer, which is fitted into the upper feeder space 41. As will be described later, this strainer 11 has a cylindrical body 12 with a required number of through holes 13 formed on its side surface and is filled with 14 fibrous materials. The lower part of this cylindrical body 12 is placed on the hemispherical protrusion 212 in a manner that it is fitted onto the outside. This strainer 11 is for filtering poured molten metal. In addition, 42, 42 is a side feeder space.

Next, based on FIG. 3, the strainer 11
details.

In the figure, 12 is a cylindrical body, and has a required number of through holes 13, 13, . . . on the side surface. Reference numeral 14 is a fibrous material such as staple wool or glass wool, which is filled in the cylindrical body 12 along the axial direction (of the cylinder). The molten metal is filtered by the fibrous material 14. The upper end port 15 of the cylindrical body 12 is for allowing the molten metal to flow in, and is arranged inside the upper end port 411 of the upper feeder space 41.

In addition, as shown in FIG. 2, in this invention, the upper feeder space (also serving as the "gate hole") 4
The relationship between the inner diameter B of strainer 11 and the outer diameter A of strainer 11 is that when 0.8≦A/B<1, the molten metal tends to cause laminar flow, and it is particularly suitable when A/B is 0.9 to 0.95. . Moreover, when this A/B is less than 0.8, turbulence occurs in the molten metal.

〔Effect of the invention〕

Since the vehicle wheel mold according to the present invention is configured as described above, that is, a hemispherical protrusion is formed at the upper end of the axle hole forming insert, and the annular space is formed. Then, the relationship between the inner diameter B of the sprue hole and the outer diameter A of the strainer is 0.8≦A/B<1, and in configuring the strainer,
A cylindrical body having a required number of through holes formed on its side surface is filled with a fibrous material, and the lower part of the cylindrical body in the strainer is placed on the hemispherical protrusion so as to be fitted onto the outside. Therefore, the molten metal that has entered the cylindrical body of the strainer in the feeder space reaches approximately the center of the hemispherical protrusion of the wheel axle hole forming insert while being filtered, and then radially flows along the hemispherical protrusion. The flow radially flows into the casting space from the through holes in the side of the cylinder. Therefore, the molten metal becomes a laminar flow, reaches the rim forming space at approximately the same speed, and is solidified at approximately the same speed. As a result, almost no residual stress remains in the rim of the cast vehicle wheel. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a mold for a vehicle wheel according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a partially sectional perspective view of a strainer. 11... Strainer, 12... Cylindrical body, 13...
Through hole, 14... Fibrous material, 2... Mold body, 2
11... Insert for forming the axle hole of the wheel, 212...
...Semispherical protrusion, 3...Casting space, 31...Hub forming space, 41...Upper feeder space, 411...
...Sprue hole.

Claims (1)

[Scope of Claims] 1. A mold body is provided with a casting space, a riser space, and a sprue hole, and the casting space is formed by forming a hub forming space located at its axial center and a hub forming space located around the hub forming space. The hub forming space is made up of a disc molding space and a rim molding space disposed around the disc molding space, and the hub forming space communicates with the feeder space, and the feeder space is connected to the hub. Extending upward along the axis of the forming space, the sprue hole is provided in the upper part of the feeder space, and an insert for forming a wheel axle hole is installed in the hub forming space, and the feeder space is extended upwardly. In the mold for a vehicle wheel, in which a cylindrical strainer is fitted around the cylindrical strainer through an annular space, a hemispherical protrusion is formed at the upper end of the axle hole forming insert, and the annular space is formed. In order to set the relationship between the inner diameter B of the sprue hole and the outer diameter A of the strainer to be 0.8≦A/B<1, and to configure the strainer,
A cylindrical body having a required number of through holes formed on its side surface is filled with a fibrous material, and the lower part of the cylindrical body is placed on the strainer with the lower part of the cylindrical body fitted onto the hemispherical protrusion. Molds for vehicle wheels.