Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1977-02-28
1978-09-12
Husar, Francis S.
Metal founding
Process
Shaping liquid metal against a forming surface
164130, 164133, 164350, 164361, B22D 1714, B22C 908, B22C 922
Patent
active
041129970
ABSTRACT:
Gas permeable shell molds and methods of using them for vacuum/inert gas casting of metal are disclosed. The single or multiple cavity gas permeable shell mold described has a riser passage with an open lower end and one or more mold cavities connected to the riser passage by gate passages each having a novel stabilizing screen member with a multiplicity of openings therein extending across it. The screen is preferably in a slanted plane with the bottom portion thereof nearer to the mold cavity. The stabilizing screen makes possible the draining of molten metal from the riser passage and from the portion of the gate passages between the stabilizing screen and the riser passage before complete solidification of the molten metal in the mold cavities, by stabilizing molten metal in the mold cavities and in the portion of the gate passages between the stabilizing screen and mold cavity, during and subsequent to the drainage of molten metal from the riser passage and from the portion of the gate passages between the stabilizing screen and the riser passage.
REFERENCES:
patent: 1030066 (1912-06-01), Erlandson
patent: 1049877 (1913-01-01), Lange
patent: 1664452 (1928-04-01), Daniels
patent: 2109530 (1938-03-01), Grundstrom
patent: 2518040 (1950-08-01), Mann
patent: 3508601 (1970-04-01), McArdle
patent: 3628598 (1971-12-01), MacNeill
patent: 3705615 (1972-12-01), Watts
patent: 3900064 (1975-08-01), Chandley
Brown John S.
Hitchiner Manufacturing Co., Inc.
Husar Francis S.
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