Metal founding – Process – Shaping a forming surface
Patent
1997-02-12
1999-07-27
Pyon, Harold Y.
Metal founding
Process
Shaping a forming surface
164 45, 164529, B22C 904
Patent
active
059273739
ABSTRACT:
A method of constructing a fully dense metal part or a metal mold half for matin with another mold half to form a mold for casting multiple parts. Steps include placing a pattern having critical pattern surfaces in a flask having an open end. The critical pattern surfaces face upward. Other steps involve covering the critical pattern surfaces with a concentrated heat reversible gel solution added to the flask, and cooling the gel solution to form an elastic solid gel mold. Further steps include removing the flask and the pattern from the elastic gel mold, and casting a ceramic mold around the solid gel mold. In other steps the gel mold is liquified for removal from the ceramic mold and the ceramic mold is inverted so that its critical ceramic surfaces face upward. Still other steps involve covering the critical ceramic surfaces with a powder, and placing a quantity of an infiltration material over the powder, and placing the ceramic mold, the powder, and the infiltration material in a furnace at a temperature sufficient to melt the infiltration material without melting and sintering the powder. The quantity of the infiltration material is sufficient to fill voids between the particles, thereby generating a fully dense mold half.
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Andes William Scott
Lin I.-H.
Pyon Harold Y.
The Procter & Gamble & Company
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