B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/158
B22C 7/02 (2006.01) B22C 9/04 (2006.01)
Patent
CA 1086472
ABSTRACT An improved method of making a ceramic mold having a cavity in which a cast product is accurately formed includes reinforcing relatively flexible wax pattern material having a configuration which corresponds to the configuration of the mold cavity. Supporting the flexible pattern material with a relatively rigid reinforcing member prevents the pattern material from deflecting during removal from the injection die, pattern storage, pattern and gating assembly and dipping of -the pattern in liquid ceramic mold material. Between dipping steps, portions of a wet ceramic coating are wiped away in areas between portions of the wet coating which will eventually form mold sections. After the ceramic mold material on the pattern has been dried, the pattern material is destroyed by heating or other methods. The resulting mold sections are then separated and the rigid reinforcing member removed from between the mold sections. The separate mold sections are interconnected to form a cavity in which a east product is accurately formed. In one specific ease, a plurality of mold sections were interconnected to form a circular mold cavity for a turbine engine components.
274921
Fetherstonhaugh & Co.
Trw Inc.
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