Metal founding – Process – Shaping a forming surface
Patent
1995-12-26
1997-04-01
Hail, III, Joseph J.
Metal founding
Process
Shaping a forming surface
164369, 164 98, 164132, B22C 910, B22D 1900, B22D 2900
Patent
active
056157266
ABSTRACT:
A casting mold includes a cavity formed therein, and an auxiliary mold projecting into the cavity. The auxiliary mold forms a concave portion in a cast product, and it exhibits a thermal expansion coefficient being more than a thermal expansion coefficient exhibited by a molten metal to be charged into the cavity. Hence, the auxiliary mold greatly expands thermally during casting, and it keeps the expanded state during the solidification of the molten metal. Accordingly, the casting mold can prevent the casting defects resulting from the shrinkage cavities from arising in the resulting cast products. All in all, the casting mold can obviate to give the auxiliary mold a tapered configuration, and it can reduce the after-casting machining allowance to be provided in the resulting concave portion.
REFERENCES:
patent: 1396341 (1921-11-01), Rautenbach
patent: 4890543 (1990-01-01), Kudou et al.
patent: 5251683 (1993-10-01), Backer
Abstract of Japanese Patent Application No. 2,084,230, Mar. 26, 1990; Derwent Publication Ltd., London, GB; AN 90136013.
Kadono Hidehiko
Nakamura Shingo
Ota Atsushi
Uda Seizi
Hail III Joseph J.
Lin I.-H.
Toyota Jidosha & Kabushiki Kaisha
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