Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1997-03-27
2000-02-01
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
164516, 164 35, 264225, 264226, 264227, 264DIG44, B22C 922, B22C 904
Patent
active
06019927&
ABSTRACT:
A flexible and resilient positive pattern is made for a desired high temperature metal or ceramic part such as a gas turbine impeller having a complex geometry with walls defining undercut spaces, and the pattern with flexible walls is dipped into a ceramic molding media capable of drying and hardening. The pattern is removed from the media to form a ceramic layer on the flexible pattern, and the layer is coated with sand and air dried to form a ceramic layer. The dipping, sanding and drying operations are repeated several times to form a multiple layer ceramic shell. The flexible wall pattern is removed from the shell, by partially collapsing with suction if necessary, to form a first ceramic shell mold with a negative cavity defining the part and to provide for reusing the pattern. A second ceramic shell mold is formed on the first shell mold to define the back of the part and a pour passage, and the combined shell molds are fired in a kiln. A high temperature casting material is poured into the shell molds, and after the casting material solidifies, the shell molds are removed by breaking the molds.
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Heitbrink Jill L.
Mason Suzanne E.
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