Method of casting a metal article having a thinwall
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United States of America Patent
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Sep 9, 2003
Grant Date -
N/A
app pub date -
Jul 12, 2002
filing date -
Jul 12, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of casting a metal article comprising the steps of forming a mold having a mold cavity with a height, a thinwall portion and a base wall portion. The thinwall portion may be less than 0.05 inches thick and free of gating. The method comprises the steps of: positioning the mold in a preheated furnace so that the furnace substantially surrounds the mold and so that a longitudinal axis of the long thin portion of the mold cavity is in an upright orientation; heating the mold in the furnace to a temperature between 1045.degree. C. and 1055.degree. C.; and drawing a vacuum in the furnace. The metal is heated until it is molten and is then poured at a temperature between 1560.degree. land 1570.degree. C. into the mold cavity. The vacuum is then broken and the mold cavity withdrawn from the furnace. The molten metal is allowed to solidify in the mold cavity so that it will solidify with a equiaxed grain structure.
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