Investment casting pins

Metal founding – Means to shape metallic material – United particle type shaping surface

Reexamination Certificate

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Details

C164S361000

Reexamination Certificate

active

07036556

ABSTRACT:
A pin used in investment casting, or the lost wax process, to support the ceramic core of a mold includes a core formed of a metal which provides suitable strength to maintain the position of the ceramic core during pouring of molten metal into the mold but which is susceptible to oxidation during firing of the mold. The pin core is encased with an outer coating formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. An intermediate coating is preferably disposed between the core and outer coating and is likewise formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. The invention also includes an investment casting mold using a plurality of these pins and methods of making the pin and the mold.

REFERENCES:
patent: 3125787 (1964-03-01), Lirones et al.
patent: 3142875 (1964-08-01), Lirones et al.
patent: 3957104 (1976-05-01), Terpay
patent: 4487246 (1984-12-01), Frasier
patent: 4986333 (1991-01-01), Gartland
patent: 5245132 (1993-09-01), Luetzow
patent: 5505250 (1996-04-01), Jago
patent: 5623985 (1997-04-01), Wheaton et al.
patent: 6119761 (2000-09-01), Anazawa et al.
patent: 6244327 (2001-06-01), Frasier
patent: 6255000 (2001-07-01), O'Connor et al.

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