Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2005-06-07
2005-06-07
Kerns, Kevin P. (Department: 1725)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S312000, C164S900000
Reexamination Certificate
active
06901991
ABSTRACT:
A metal alloy is heated to a molten state and is poured into a shot sleeve of a vertical die cast press and on top of a shot piston. The shot sleeve is transferred to an injection station while the molten alloy is cooled to a semi-solid slurry and a globular, generally non-dendritic microstructure. A retractable cooling pin is temporarily inserted into a center portion of the slurry while in the shot sleeve to obtain optimum cooling. A center portion of the slurry is injected upwardly by the piston through a gate opening into a die cavity while an outer more solid portion of the slurry is entrapped in an annular recess. After the slurry solidifies, the shot piston retracts, and the shot sleeve is transferred to a position where the residual biscuit is removed. Another shot sleeve filled with the molten allow is transferred, and the process is repeated.
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Jorstad, Oct. 2001, North American Die Casting Association, Science and Technology of Semi-Solid Metal Processing, Chapter 4 “Processing of SSM: Practical Considerations”, p. 2, 3, 6.
Jorstad John L.
Kamm Richard J.
Jacox Meckstroth & Jenkins
Kerns Kevin P.
THT Presses Inc.
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