B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/162, 22/183,
B22D 18/06 (2006.01) B22C 9/04 (2006.01)
Patent
CA 1330385
COUNTERGRAVITY CASTING PROCESS AND APPARATUS USING DESTRUCTIBLE PATTERNS SUSPENDED IN AN INHERENTLY UNSTABLE MASS OF PARTICULATE MOLD MATERIAL Abstract of The Disclosure A countergravity casting process involving 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.
589952
Gm Global Technology Operations Inc.
Macrae & Co.
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