Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1981-08-05
1988-09-20
Godici, Nicholas P.
Metal founding
Process
Shaping liquid metal against a forming surface
164 80, 164113, 164900, B22D 1700, B22D 2300
Patent
active
047718188
ABSTRACT:
A process for shaping a metal alloy in which a semi-solid metal alloy charge is shaped under pressure in a closed die cavity. The metal alloy is vigorously agitated, while in the form of a liquid-solid mixture, to convert from 30% to 55% by volume to discrete degenerate dendritic solid particles. The liquid-solid mixture is then cooled to solidify the mixture and reheated to form a semi-solid slurry. The reheated metal alloy slurry contains discrete degenerate dendritic primary solid particles, in a concentration from about 70 to 90% by volume based upon the volume of the alloy, suspended homogeneously in a secondary liquid phase. The process is characterized by low pressure and very rapid shaping and solidification times. The process produces complex, close tolerance, high quality metal alloy parts.
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Alumax Inc.
Godici Nicholas P.
Reedbatten, Jr. J.
Wittenberg Malcolm B.
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