Metal casting in a sand mold having a sodium bentonite clay bind

Details Metal casting in a sand mold having a sodium bentonite clay bind Metal casting in a sand mold having a sodium bentonite clay bind

1993-09-27

1994-08-02

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

164525, B22C 118, B22C 902

Patent

active

053336739

ABSTRACT:
Molten metal is cast into a mold cavity formed of sand held in a predetermined mold configuration by a binder comprising a plurality of sodium bentonite clays. A blend of two or more sodium bentonite clays obtained from different areas as a foundry sand binder synergistically and unexpectedly improves the foundry sand used as a mold cavity for casting metal objects by unexpectedly improving one or more of the following foundry sand properties beyond the level of either of the blended sodium bentonites alone: green compressive strength; hot compressive strength; dry compressive strength; wet tensile strength; flowability; surface finish; activation speed and shakeout.

REFERENCES:
patent: 2876511 (1959-03-01), Baugh
patent: 2997400 (1961-08-01), Greenewald, Jr.
patent: 3431123 (1969-03-01), Zrimsek et al.
patent: 3445251 (1969-05-01), Nevins
patent: 4203771 (1980-05-01), Matsui
patent: 4505750 (1985-03-01), Cowan

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