Method for forming casting molds

Details Method for forming casting molds Method for forming casting molds

1976-05-10

1977-08-23

Shore, Ronald J.

Metal founding

Process

Shaping a forming surface

164 21, 164 23, 164 43, 164244, 164359, 164361, B22C 122, B22C 908

Patent

active

040433781

ABSTRACT:
An improved method of forming a shell mold for casting having a shrink bob is provided. A tubular frusto-conical shrink bob, or riser, is first formed from sand and a plastic or resin binder such that both the apex and base of the riser are open. The riser is then inverted and positioned on a casting pattern with the apex of the riser abutting against the casting pattern. The entire pattern is then cast with a thermosetting material, such as sand and a binder, such that the thermosetting material bonds to both the pattern and the riser. After hardening, the thermosetting material with the attached riser forms a shell mold which is subsequently utilized in a foundry casting operation.

REFERENCES:
patent: 2654925 (1953-10-01), Ensign et al.
patent: 2691196 (1954-10-01), Banister
patent: 2797457 (1957-07-01), Kramer
patent: 2845669 (1958-08-01), Hackett et al.
patent: 3478815 (1969-11-01), Worthington
patent: 3598167 (1971-08-01), Snyderman
patent: 3614980 (1971-10-01), Lander
patent: 3835913 (1974-09-01), Vandemark et al.

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