Process for the lost foam casting, under low pressure, of alumin

Details Process for the lost foam casting, under low pressure, of alumin Process for the lost foam casting, under low pressure, of alumin

1991-04-24

1992-11-10

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

164120, B22C 904, B22D 2104, B22D 2713

Patent

active

051615959

ABSTRACT:
A pattern of an aluminum alloy article made from a foam of an organic substance. The pattern is immersed in a mold of dry sand containing no binder. The mold is filled with molten aluminum alloy from a feeder zone and the alloy is allowed to solidify, thereby creating at least one critical zone in which solidification takes place last. Before the solidified fraction of metal exceeds 40% by weight, an isostatic gas pressure is applied to the mold. The aluminum alloy has a solidification range higher than 30.degree. C. and a ratio R of the distance between the feeder zone and at least one critical zone to half the means thickness of the article over this distance is greater than 10. The isostatic gas pressure being applied is between 0.1 and 0.5 MPa.

REFERENCES:
patent: 4139045 (1979-02-01), Vitt

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