Method for producing foundry mold for metal casting

Details Method for producing foundry mold for metal casting Method for producing foundry mold for metal casting

1981-03-05

1983-08-23

Hampilos, Gus T.

Metal founding

Process

Shaping a forming surface

164 12, 164522, 164528, B22C 912, B22C 900, B22C 118

Patent

active

043998585

ABSTRACT:
In a method for producing a mold for metal casting capable of being easily disintegrated by water which comprises the steps of kneading alumina sand with hydrous sodium aluminate as a binder, forming the kneaded mixture into the desired mold shape and then passing carbon dioxide gas through the mold to decompose sodium aluminate and harden it; the improvement wherein the kneading of alumina sand with the binder before mold formation is carried out in an atmosphere of carbon dioxide gas to decompose 50 to 80% of the sodium aluminate in advance.

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