Method of forming cavities in ceramic or metal injection molded parts using a fugitive core
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Aug 12, 1997
filing date -
Jun 17, 1997
priority date (Note) -
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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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