Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2006-05-02
2006-05-02
Lin, Kuang Y. (Department: 1725)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S900000
Reexamination Certificate
active
07036551
ABSTRACT:
The present invention relates to a method of molding a low-melting-point metal alloy which exhibits thixotropy properties in a solid-phase and liquid-phase coexisting temperature region. In this method, a temperature of a heating holding cylinder is increased to a liquidus temperature or higher at the start of a molding operation. Then a remaining material in the preceding molding remaining in the heating holding cylinder in a solid state is wholly melted. After that a temperature of the heating holding cylinder is lowered to a temperature in the solid-phase and a liquid-phase coexisting temperature region. At the same time a molding material is supplied and a provisional molding is carried out. After the temperature has reached the solid-phase and liquid-phase coexisting temperature region, a regular molding is started. By the present invention a problem of a remaining material in the heating holding cylinder, which becomes a trouble at the start of molding by injection, is solved.
REFERENCES:
patent: 2001/0020526 (2001-09-01), Motegi et al.
patent: 2004/0182537 (2004-09-01), Takizawa et al.
patent: 2001-252759 (2001-09-01), None
patent: 2003-200249 (2003-07-01), None
Anzai Kazuo
Takei Koji
Yamazaki Ko
Lin Kuang Y.
Nissei Plastics Industrial Co. Ltd.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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