Method and apparatus for use in molding articles

Details Method and apparatus for use in molding articles Method and apparatus for use in molding articles

1976-06-01

1983-01-11

Hampilos, Gus T.

Metal founding

Process

Shaping liquid metal against a forming surface

164 27, 164129, 164130, 164350, 164364, B22D 1722

Patent

active

043677827

ABSTRACT:
An improved method is utilized to make an improved mold for forming a plurality of small objects, such as piston rings. The mold is made by stacking a plurality of mold sections formed of gas permeable material, such as CO.sub.2 sand, resin bonded sand or green sand. The stacked mold sections are then clamped together to hold them against movement relative to each other. A wet coating of liquid ceramic material is then applied over the stack of mold sections. This liquid ceramic mold material is dried to form a rigid gas permeable ceramic casing which encloses the stack of mold sections. The rigid casing of ceramic material holds the mold sections against movement relative to each other to prevent break-out of metal from between the mold sections when a flow of molten metal is directed into the mold cavities. Due to the gas permeable construction of both the rigid ceramic casing and the mold sections, gas can readily escape from the mold as the molten metal enters the mold cavities.

REFERENCES:
patent: 2756473 (1956-07-01), Anderson et al.
patent: 2975482 (1961-03-01), Babcock
patent: 3136011 (1964-06-01), Peras
patent: 3628598 (1971-12-01), MacNeill
patent: 3669177 (1972-06-01), Ingalls et al.
patent: 3848654 (1974-11-01), Boyle et al.
patent: 4043378 (1977-08-01), Pennington

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