Investment casting pattern material comprising thermally-collaps

Details Investment casting pattern material comprising thermally-collaps Investment casting pattern material comprising thermally-collaps

1992-04-27

1994-11-15

Berman, Susan W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 74, 522 78, 522 79, 522 80, 522102, 522103, C08F 250, C08K 500

Patent

active

053648897

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 Technical Meeting: Investment Casting Institute 1989, pp. 1-8.
The 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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