Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1988-05-25
1989-08-22
Seidel, Richard K.
Metal founding
Process
Shaping liquid metal against a forming surface
164255, B22D 1806
Patent
active
048586722
ABSTRACT:
Apparatus for vacuum countergravity casting includes a gas permeable upper mold member and a lower mold member engaged to the upper mold member. A gas impermeable member includes a central portion overlying the upper surface of the upper mold member and in contact therewith at a plurality of spaced apart contact regions disposed across the horizontal dimension of the upper surface and further includes a peripheral portion in sealed relation substantially about the upper mold member. Reduced pressure is applied between the gas impermeable member and the upper mold member to draw molten metal into mold cavities therein when the lower mold member is placed in a molten metal pool. Simultaneously, ambient pressure, such as atmospheric pressure, above the gas impermeable member is transmitted by the contact regions to the upper mold member in opposition to ambient pressure transmitted to the lower mold member to substantially reduce bending stresses in the mold. As a result, thinner molds can be used or molds having a greater ratio of horizontal mold dimension to vertical mold dimension can be used to reduce the amount of mold material used per casting.
REFERENCES:
patent: 2379401 (1945-06-01), Poulter
patent: 2705822 (1955-04-01), Vennerholm
patent: 2991518 (1961-07-01), Schaefer
patent: 3608617 (1971-09-01), Burke
patent: 3731726 (1973-05-01), Eberle
patent: 3825058 (1974-07-01), Miura et al.
patent: 3998264 (1976-12-01), Hocking
patent: 4340108 (1982-07-01), Chandley et al.
patent: 4606396 (1986-08-01), Chandley et al.
patent: 4616691 (1986-10-01), Voss
patent: 4641703 (1987-02-01), Voss et al.
General Motors Corporation
Seidel Richard K.
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