Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1994-04-28
1996-11-26
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
1643381, B22D 2704
Patent
active
055775470
ABSTRACT:
A method for casting long thin metal articles is described. A particular embodiment is directed to the casting of seals that are used in the low pressure turbine section of a gas turbine engine. The method first involves forming a mold, and then preheating the mold so that the temperature towards the upper portion of the mold is close to the liquidus temperature of the metal composition being cast. The temperature of the bottom portion of the mold is below the solidus temperature of the metal alloy composition. After the metal is poured into the mold cavity, the mold heating system preferably is moved at a selected rate so that the portion of the mold being heated by the furnace is slowly decreased. Withdrawal rates slower than about 30 inches per hour produce satisfactory casting results.
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patent: 5275227 (1994-01-01), Staub
Lin Kuang Y.
Precision Castparts Corp.
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