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
1997-08-12
1999-10-26
Derrington, James
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
264635, 264645, 264669, 264670, 2643282, 264317, 419 5, 419 65, B22D 302, C04B 3804
Patent
active
059722690
ABSTRACT:
A method of injection molding ceramic or metal parts having an internal cavity or other complicated shape. A fugitive core is formed of a particulate and a first binder. The core is then suspended in a conventional injection molding cavity. The part is then injection molded by injecting a ceramic or metal powder mixed with a second binder while in a plastic state into the mold cavity and around the suspended core. Once the second different binder hardens or gels, the molded part together with the core are removed from the mold cavity. The molded part and core are then subject to a debinding process to debind the first binder to thereby remove the core. Because two different binders were used for the core and molding, the binder used to form the molded part remains unaffected when removing the core.
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Andreotti Eugene R.
Barros Eduardo L.
Derrington James
Taurus International Manufacturing, Inc.
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