Method of manufacturing shell cores and molds

Details Method of manufacturing shell cores and molds Method of manufacturing shell cores and molds

1976-12-27

1978-05-16

Spicer, Jr., Robert L.

Metal founding

Process

Shaping a forming surface

164200, B22C 912

Patent

active

040893634

ABSTRACT:
The method is a "cold box" method in which a porous or thoroughly vented pattern is used. The pattern is preferably completely filled with sand, packed tightly, and then gassed through the pattern with a binder-curing gas catalyst. Control of depth of penetration of the gas catalyst is achieved by control of pre- and post-gassing pressures. The residual pre-gassing interstitial inert gas (usually air) is utilized as an internal cushion which limits penetration of the advancing catalyst gas.

REFERENCES:
patent: 2874428 (1959-02-01), Bonney, Jr.
patent: 3006046 (1961-10-01), Shephard, Jr. et al.
patent: 3008205 (1961-11-01), Blaies, Jr.
patent: 3100919 (1963-08-01), Vayda
patent: 3145438 (1964-08-01), Kottke et al.
patent: 3428110 (1969-02-01), Walker et al.
patent: 3556195 (1971-01-01), Lund
patent: 3639654 (1972-02-01), Robins

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