JPH08229637A - Protective device of copper alloy mold - Google Patents

Abstract

PURPOSE: To improve durability of copper alloy mold by providing an insert member to overheated part. CONSTITUTION: A mold for vehicle wheel has a lower mold, horizontal mold, upper mold 40, further an inserts 21, 411 and auxiliary mold 41. A cavity consisting of a disk forming part 51, spoke forming part 52, etc., with these molds 21, 40, 41, 411, etc. An insert member 80 is arranged to a projecting part 212 consisting of the spoke forming part 52, etc. The insert member 80 is of cylindrical shape as fitted outside the projecting part 212 and fixed for coming off prevention by press fitting a pin 81 and welding 83. The insert member 80 is formed with a material having melting point higher than copper, e.g. die steel or ceramic. By this method, the overheated part is protected by the insert member and is hard to be eroded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper alloy mold protector.

[0002]

2. Description of the Related Art Recently, many molds made of copper alloy have been used, paying attention to their excellent thermal conductivity.

[0003]

However, in such a copper alloy mold, since the material copper is softer than iron and also has a low melting point, when the molten metal is filled, the overheated portion near the weir or the like is filled. Has a disadvantage that it is easily melted and, as a result, it is difficult to improve the durability of the mold.

An object of the present invention is to eliminate such inconvenience.

[0005]

In order to achieve the above-mentioned object, in a copper alloy mold protecting apparatus according to the present invention,
The insert member is installed in the superheated portion on the cavity wall surface of the copper alloy mold.

[0006]

Since the copper alloy mold protector according to the present invention is constructed as described above, the overheated portion is protected by the insert member and is therefore less likely to be melted and damaged.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of a low pressure casting mold device for a vehicle wheel, FIG. 2 is an enlarged view of a II portion in FIG. 1, and FIG. 3 is a view of another embodiment corresponding to FIG.

In FIG. 1, reference numeral 10 denotes a mold set for forming a vehicle wheel in this casting apparatus D.
The mold set 10 is a combination of molds made of a copper alloy, and is a combination of a lower mold 20, a pair of horizontal molds 30 and 30, and an upper mold 40. 50 is a cavity, which is formed by the mold set 10. The cavity 50 has a vehicle wheel shape and is composed of a disk forming portion 51, a spoke forming portion 52, and a rim forming portion 53. Reference numeral 21 is a nest of the lower mold 20, which is for forming the surface of the disk portion (of the vehicle wheel). Further, 41 is an auxiliary mold of the upper mold 40, and 411 is a nest of the auxiliary mold 41, each for forming the back surface of the disk portion (of the vehicle wheel).

Reference numeral 211 denotes a weir, and the nest 21 (of the lower mold 20) 21
Is formed substantially at the center. 70 is a molten metal supply pipe,
It is connected to the weir 211 and extends downward. The molten metal of a molten metal holding furnace (not shown) is filled in the cavity 50 by low pressure casting through the molten metal supply pipe 70.

Next, 212 is a convex portion (corresponding to the "overheat portion" of the present invention), which is formed integrally with the insert 21 of the lower mold 20. The convex portion 212 is a portion that forms a concave portion of the disk portion of the wheel, and is located near the weir 211. Therefore, the molten metal that enters the cavity 50 is likely to collide with and overheat.

In FIGS. 1 and 2, reference numeral 80 denotes a cylindrical insert member, which is fixed to the protruding portion 212 by press-fitting the pin 81 and welding 83 so that the pin 81 does not come off. . Here, even if the molten metal heats the convex portions 212, the thermal expansion rate of iron is smaller than the thermal expansion rate of copper, so that the adhesion of the convex portions 212 to the insert member 30 is improved. The insert member 80 is a material having a higher melting point than copper, which is the material of the mold (eg, die steel or ceramic).
Is formed by. Further, as shown in FIG. 3, if the insert member 80 is crowned, a product having a smooth casting surface can be obtained. A convex iron member 82 as the insert member 80 may be fixed to, for example, the upper die 40 as shown in FIG.

[0012]

EFFECT OF THE INVENTION Since the copper alloy mold protector according to the present invention has the insert member installed in the overheated portion of the cavity wall of the copper alloy mold, the overheated portion is protected by the insert member and is therefore less likely to be melted and damaged. is there.

Therefore, by using this copper alloy mold protector, the durability of the copper alloy mold can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a low pressure casting mold device for a vehicle wheel.

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

FIG. 3 is a diagram of another embodiment corresponding to FIG.

[Explanation of symbols]

 20… Lower mold (copper alloy mold) 21… Nesting (copper alloy mold) 212… Convex part (overheated part) 30… Horizontal type (copper alloy mold) 40… Upper mold (copper alloy mold) 41… Auxiliary mold (copper) Alloy mold) 411… Nesting (copper alloy mold) 50… Cavity 80… Insert member

Claims (1)

[Claims] 1. An apparatus for protecting a copper alloy mold, wherein an insert member is installed in an overheated portion of a cavity wall surface of the copper alloy mold.