Method and apparatus for injection molding of semi-solid metals

Details Method and apparatus for injection molding of semi-solid metals Method and apparatus for injection molding of semi-solid metals

1994-06-14

1996-03-26

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164 711, 164312, 164900, B22D 1700, B22D 2300, B22D 2708

Patent

active

055012663

ABSTRACT:
A new method and apparatus for the injection molding of semi-solid materials (SSM). In this process (called Rheomolding), a superheated liquid metal is cooled into the semi-solid state in the barrel of a special vertical injection-molding machine, with the growing dendrites of the solid phase being broken into small and nearly spherical particles by the shearing force generated by the screw and barrel. Compared with the superheated liquid metal, SSM has lower temperature, lower shrinkage and a more stable flow pattern. Therefore, the rheomolding process can produce net-shape metal or metal-matrix-composite parts continuously at lower cost.

REFERENCES:
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Metz, S. A. et al, "A Fundamental Study of Hot Tearing", AFS Transactions, vol. 78, pp. 453-460, 1970.
Spencer, D. B. et al, "Rheological Behavior of Sn-15 % Pb in the Crystallization Range", Metallurgical Transactions, vol. 3, pp. 1925-1932, 1972.
Flemings, M., et al, "Rheocasting", Materials Science and Engineering, vol. 25, pp. 103-117, 1976.
Tisier, A., et al, "Magnesium Rheocasting: A study of Processing-Microstructure Interactions", Journal of Materials Science, vol. 25, No. 2B, pp. 1184-1196.
Wang, N., et al., "Formation and Growth of Solid Particles in Shear Flow", Journal of Materials Science, vol. 25, pp. 2185-2197, 1990.

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