Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2008-03-18
2008-03-18
Lin, Kuang (Department: 1793)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S312000, C164S900000
Reexamination Certificate
active
11504958
ABSTRACT:
The present invention provides a pressure casting method of a magnesium alloy. In the method, a molten magnesium alloy is cooled to form a partially molten state containing a solid-phase, and the partially molten state is further cooled to form a solid-phase granularly crystallized solid material. The solid material is partially-melted and pressure cast into a mold by a molding machine. A ratio of primary crystals in said solid material is set to 55 to 65%. The solid material is partially-melted in a solid-phase and liquid-phase coexisting state at a selected heating temperature so that a semi-solid having thixotropic properties and having the size of a main solid phase of 50 to 250 μm and a solid-phase ratio of 30 to 70% is formed. The semi-solid is pressure cast into a mold through a nozzle while maintaining the semi-solid state to form metal products having a ratio of primary crystals of 20 to 50%.
REFERENCES:
patent: 5501748 (1996-03-01), Gjestland et al.
patent: 2001/0020526 (2001-09-01), Motegi et al.
patent: 1 132 162 (2001-09-01), None
patent: 90 10893 (1997-01-01), None
patent: 2001-252759 (2001-09-01), None
Motegi Tetsuichi
Takayama Kazutoshi
Takizawa Kiyoto
Chiba Institute of Technology
Lin Kuang
Nissei Plastic Industrial Co. Ltd.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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