Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1997-08-19
1999-11-02
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 37, B22K 312
Patent
active
059764570
ABSTRACT:
The present invention relates to a method for rapid fabrication of molds and mold components. This method involves first the step of producing a digital CAD representation of the mold; using this digital representation to make a set of oversized core and cavity three dimensional models, patterns or replicas, by using solid modeling technologies; placing these models, patterns or replicas respectively into a mold base with die pockets to accept the patterns; powder injection molding fine metal powders around each version of the core and cavity of the part to produce a "green" molded article having the negative or female impression or the original core and cavity patterns; debinding these "green" articles to remove the binder; sintering the debound articles to produce the final tool steel or related alloy molds; and performing secondary operations to fit then into a master mold base as part of a complete molding tool. These molds or molding dies and mold components can be used as part of a rapid prototyping mold or as permanent mold that can be used produce parts made out of plastic, metal, ceramic or composite materials. The result will be a reduction both in time and cost as compared to the construction of a standard injection molding die using established methodologies of carbon electrode grinding, electric discharge machining (EDM) and other processes.
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Amaya Herman E.
Crounse Dennis Kent
Edelson Leon I.
Jenkins Daniel J.
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