Mold and method for making variable thickness cast articles

Details Mold and method for making variable thickness cast articles Mold and method for making variable thickness cast articles

1991-10-10

1993-05-25

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164124, 164127, 1643381, 164348, 164353, B22D 2704

Patent

active

052131491

ABSTRACT:
A permanent metal mold (12) has a casting cavity (18) within which variable thickness molten metal articles (20) are cast. Portions (26) of the casting cavity walls (16) are formed oversized and lined with sand (44) to conform with the external size and shape of certain thick (46) and thin (48) sections of the cast article (20). The thickness of the sand liner (44) is reversely correlated to the thick (46) and thin (48) sections of the article (20) to cause these sections (46, 48) to cool at different rates in order to achieve an approximately equalized cooling time of these sections (46, 48). Other portions (50, 52) of the casting cavity walls (16) are formed bare of the sand liner (44) and conform with the external size and shape of other corresponding sections (54, 56) of the cast article (20). These bare metal portions (50, 52) can either be heated or cooled or both during casting in order to precisely control the cooling rates of these other sections (54, 56) of the cast article (20) and thus precisely control their resultant physical properties.

REFERENCES:
patent: 1678655 (1928-07-01), Sipp
patent: 4674553 (1987-06-01), Witt
patent: 4742863 (1988-05-01), Witt
patent: 5072773 (1991-12-01), Ruff et al.
patent: 5092390 (1992-03-01), Witt

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