Methods for manufacturing investment casting shells

Details Methods for manufacturing investment casting shells Methods for manufacturing investment casting shells

2005-10-04

2005-10-04

Lin, Kuang Y. (Department: 1725)

Metal founding

Process

Shaping a forming surface

C164S035000

Reexamination Certificate

active

06951239

ABSTRACT:
An at least two step heating process is used to strengthen the shell of an investment casting mold including a refractory metal core. The first stage may occur under otherwise oxidizing conditions at a low enough temperature to avoid substantial core oxidation. The second stage may occur under essentially non-oxidizing conditions at a higher temperature.

REFERENCES:
patent: 6209621 (2001-04-01), Treacy
patent: 6637500 (2003-10-01), Shah et al.
patent: 2002/0104639 (2002-08-01), Kroes

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