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US 2004/0069438 A1Published application
Lost-foam casting apparatus for improved recycling of sprue-metal
AssigneeGeneral Motors Corporation
InventorsJune-Sang Siak, Gordon Alwin Tooley, Mark Eugene Hoover, Jerry Allen Barendreght
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Abstract
Apparatus for the gravity-cast, “lost-foam” casting of metal castings, including a fugitive, pyrolizable foam pattern forming a casting cavity in a bed of loose sand, and a hollow sprue for supplying melt to the casting cavity, wherein the sprue consists essentially of the same metal as is being cast. A high-temperature, porous vent is provided adjacent the discharge end of the metal sprue to expel air from the sprue that would otherwise be trapped therein.
Claims11
Apparatus for the gravity, lost-foam, casting of a metal into a desired shape comprising:
- (1) a bed of loose sand forming a mold having a molding cavity therein conforming to said shape;
- (2) a flask containing said bed;
- (3) a fugitive pattern embedded in said sand and shaping said molding cavity, said pattern comprising a polymeric foam pyrolizable by molten said metal;
- (4) a fugitive body attached to said pattern and forming a gating system in said sand for supplying molten said metal to said molding cavity;
- (5) an inlet to said gating system for admitting molten metal into said gating system;
- and (6) a hollow sprue embedded in said sand adjacent said pattern for supplying molten said metal to said inlet, said sprue consisting essentially of said metal.
3 more elements
Dependencies are inferred from the claim text.