Casting method using cavityless mold

Details Casting method using cavityless mold Casting method using cavityless mold

1976-04-30

1978-04-25

Husar, Francis S.

Metal founding

Process

Shaping a forming surface

164 34, 164 62, 164171, B22C 1520, B22C 904

Patent

active

040857905

ABSTRACT:
A casting mold filled with free-flowing particulate matter such as sand, in which there is imbedded a vaporizable insert or pattern of wax, foam polymer or the like conforming to the shape of the desired casting, has at least two of its walls formed by flexible membranes exposed to the atmosphere for creating a more or less isobaric pressure upon the application of suction to its interior. One membrane may span the open top of a four-sided rigid shell whose perforated bottom is overlain by another such membrane; alternatively, with the sidewalls of the shell also perforated and/or vertically ribbed or fluted, five membranes may be combined into an open-topped bag lining the interior of the shell, the top of the bag being closed by a sixth membrane after introduction of the sand filling and its pattern insert.

REFERENCES:
patent: 2173593 (1939-09-01), Phelps
patent: 3410942 (1968-11-01), Bayer
patent: 3572421 (1971-03-01), Mezey
patent: 3868986 (1975-03-01), Olsen

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