Process for producing molds or cores for investment casting with

Details Process for producing molds or cores for investment casting with Process for producing molds or cores for investment casting with

1988-01-12

1989-03-07

Lin, Kuang Y.

Metal founding

Process

Including recycling of process material

164 44, 164 36, B22C 902

Patent

active

048097616

ABSTRACT:
In an investment casting process wherein molds or cores are prepared by forming them around a polymer pattern and then dissolving the pattern with a solvent, solvent losses can be reduced by heating the mold or core before contacting it with the solvent to reduce the amount of solvent adsorbed in the mold or core. An improved process comprises: (a) forming the mold or core around the pattern; (b) heating the mold or core; (c) dunking or spraying the mold or core with the solvent until the pattern is dissolved; (d) placing the mold or core in a drying chamber in the path of circulating heated air; (e) cooling the air to condense the solvent; (f) recovering the condensed solvent; and (g) reheating the air until it is no longer saturated with solvent and recycling the air to the drying chamber. The preliminary heating step can reduce solvent losses by 66 percent and the entire improved process can reduce solvent losses by about 90 percent.

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