Semi-solid molding apparatus and method

申请公布号：US6901991(B2)

申请号：US20030422333

申请日期：2003.04.24

申请公布日期：2005.06.07

申请人：

THT PRESSES INC.

发明人：KAMM RICHARD J.;JORSTAD JOHN L.

分类号：B22D21/04;B22D17/00;B22D17/12;B22D17/20;B22D27/20;(IPC1-7):B22D17/12;B22D27/04

主分类号：B22D21/04

摘要：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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