Method for producing intricately shaped particulate bearing prec

Details Method for producing intricately shaped particulate bearing prec Method for producing intricately shaped particulate bearing prec

1992-01-21

1993-09-28

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

264 41, 264 86, 264 87, 264109, 2643286, 2643288, 26432816, 264334, B28B 710, B29B 700, B29C 4142, B29C 4500

Patent

active

052484572

ABSTRACT:
Particulate bearing precursor components are formed into intricate shapes yet possess controlled porosity by injection molding a mixture of particulate materials, thermosetting condensation resins, and low temperature catalysts. The mixture, when flowed into a mold cavity of an appropriate shape and heated, initiates a curing reaction which binds particulates together with a film that leaves the space between the particulates open. A positive volume change occurs during cure, providing for a more uniform pressure profile in the part. Also, a condensate is produced during the curing step which, when vented from the mold in strategic locations, allows manipulation of the curing reaction. This provides the ability to affect local density in the vicinity of the vent. Thus, one can correct for artificially, or incorrectly induced density or porosity gradients, and improve dimensional accuracy and other attributes of the subsequent processing steps.

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