Investment casting method and pattern material comprising therma

Details Investment casting method and pattern material comprising therma Investment casting method and pattern material comprising therma

1991-02-14

1993-01-05

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164 34, B22C 904

Patent

active

051761882

ABSTRACT:
A method and composition for forming investment casting patterns wherein thermally-collapsible microspheres are incorporated into the pattern composition. The patterns can be made either by conventional pattern forming techniques or by solid imaging techniques. After investing the microsphere containing pattern in the ceramic shell, the pattern and shell are heated, causing a collapse of the microspheres and thereby preventing cracking of the shell. The shell is then heated to burn-out the remaining pattern material and fire the shell, thereby creating a mold.

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Applications of Stereolithography in Investment Casting by Frost R. Prioleau, 37th Annual Technical Meeting: Investment Casting Institute 1989, pp. 1-5.
Investment Casting of Optical Fabrication and Stereolithography Models by Myron J. Bezdicek 37th Annual Tech. Mtg.: Investment Casting Institute 1989, pp. 1-8.
This Causes and Prevention of Shell Mould Cracking by the Green Mould Quality Sub-Committee, published by the British Investment Casting Trade Association, issued Aug. 1975.

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