Method and mold for sand casting varying thickness articles

Details Method and mold for sand casting varying thickness articles Method and mold for sand casting varying thickness articles

1990-08-31

1992-03-03

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164127, 164254, 164353, B22D 2715

Patent

active

050923900

ABSTRACT:
Molten metal is cast in a cavity formed within a permanent, metal mold. The major portion of the cavity is lined with a sand liner whose thickness is reversely correlated to the thickness of the integral sections of a varying thickness cast metal article. However, portions of the metal cavity are bare and such portions form a part of the interior casting surface defined by the sand liner. Thus, the cast metal contacting the bare metal portions of the mold uniformly and rapidly chills to produce harder surface areas on the finished cast article, while the remaining portions of the cast article tend to cool at a generally equalized cooling rate corresponding reversely to the thickness of the sand liner. A vacuum is applied to the casting cavity during filling with molten metal for rapidly filling the sand lined cavity and insuring complete contact between the molten metal and the bare metal portions of the casting cavity.

REFERENCES:
patent: 1560832 (1925-11-01), Lee
patent: 4674553 (1987-06-01), Witt
patent: 4742863 (1988-05-01), Witt

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