Method of casting a metal article
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United States of America Patent
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-
Nov 26, 1996
Grant Date -
N/A
app pub date -
Apr 28, 1994
filing date -
Apr 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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