Method and apparatus for metal casting

Details Method and apparatus for metal casting Method and apparatus for metal casting

2005-01-06

2008-10-07

Kerns, Kevin P (Department: 1793)

Metal founding

Means to shape metallic material

Including ladle or crucible type melt receptacle

C164S358000, C164S134000

Reexamination Certificate

active

07431069

ABSTRACT:
A technique for pressurized or differential pressure casting according to the present disclosure provides a riser tube filter formed of ceramic foam having a specific gravity lower than the molten metal to be cast. A riser tube filter according to the present invention may float in and/or on the molten metal within the riser tube and smooth the flow of molten metal within the riser tube simultaneously filtering the metal. As the molten metal is depressurized, a riser tube filter according to the present disclosure will travel back down the riser tube engaging the walls of the riser tube and minimizing the surface of molten metal in contact with the air or other gas. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

REFERENCES:
patent: 2865068 (1958-12-01), Dunn
patent: 4961455 (1990-10-01), Redemske et al.
patent: 5169542 (1992-12-01), Kaettlitz et al.
patent: 5336295 (1994-08-01), DeYoung et al.
patent: 5673902 (1997-10-01), Aubrey et al.
patent: 6485541 (2002-11-01), Hryn et al.
patent: 6578620 (2003-06-01), Trudel et al.

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