Metal founding – Process – Shaping a forming surface
Patent
1988-05-09
1989-10-17
Seidel, Richard K.
Metal founding
Process
Shaping a forming surface
164 63, 164119, 164255, 164306, B22C 904, B22D 1806
Patent
active
048740292
ABSTRACT:
A countergravity casting process involves holding an inherently unstable mass of particulate mold material in an open bottom container around a destructible pattern therein by exerting external fluid pressure, such as atmospheric pressure, on a bottom side of the particulate mass in excess of internal pressure in the container. The container and an underlying molten metal pool are relatively moved to place the bottom side of the particulate mass in the pool. Molten metal is drawn through an ingate to the pattern to destroy and replace the pattern in the particulate mass. When the container and pool are relatively moved to extract the bottom side from the pool after casting, the particulate mold material is held in the container around the metal replacing the pattern by the external/internal pressure differential between the bottom side of the particulate mass and interior of the container. The particulate mold material and solidified metal therein are removed from the container by equalizing the external and internal pressures. Typically, atmospheric pressure is exerted on the bottom side of particulate mass while subatmospheric pressure is provided in the container.
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Batten, Jr. J. Reed
General Motors Corporation
Seidel Richard K.
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