Lost-foam casting of aluminum under pressure

Details Lost-foam casting of aluminum under pressure Lost-foam casting of aluminum under pressure

1989-11-16

1991-05-14

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

164120, B22C 904, B22D 2713, B22D 2104

Patent

active

050147641

ABSTRACT:
An organic foam pattern of the article to be cast is immersed in a dry sand mold containing no binder, the mold is filled with molten aluminum or aluminum alloy which replaces the foam and gradually solidifies, and an increasing isostatic gas pressure is simultaneously applied to the mold and to the aluminum or aluminum alloy after filling of the mold is complete. The isostatic gas pressure rises to a maximum value higher than 1.5 MPa and up to 10 MPa, and results in cast articles having improved mechanical characteristics and, in particular, better resistance to fatigue.

REFERENCES:
patent: 3420291 (1969-01-01), Chandley et al.
patent: 4709461 (1987-12-01), Freeman, Jr.

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