Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1990-02-09
1991-09-10
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
1641222, B22D 2704
Patent
active
050465473
ABSTRACT:
An improved method of casting provides for the blocking of the upper end portion of a mold structure during preheating of the mold structure in a furnace and/or withdrawal of the mold structure from the furnace. The mold structure is raised into a furnace chamber with a cover blocking the upper end portion of the mold structure. In the illustrated embodiment of the invention, the cover moves upwardly through the furnace chamber to a location immediately above an upper sidewall of the furnace chamber. When the mold has been preheated, the cover is removed and molten metal is pored into the mold structure. The cover is then replaced on the mold structure. The molten metal in the mold structure is solidified by slowly withdrawing the mold structure from the furnace chamber with the cover blocking the upper end portion of the mold structure. Once the mold structure has been completely withdrawn from the furnace chamber and the molten metal in the mold structure has solidified, the cover is removed.
REFERENCES:
patent: 3385346 (1968-05-01), Fleck
patent: 3633648 (1972-01-01), Barrow et al.
patent: 3795978 (1974-03-01), Raymond et al.
patent: 3810504 (1974-05-01), Piwonka
patent: 4712604 (1987-12-01), Sawyer
Lin Kuang Y.
PCC Airfoils, Inc.
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