Process for molding polymer bearing cage with amorphous case

Details Process for molding polymer bearing cage with amorphous case Process for molding polymer bearing cage with amorphous case

1991-12-09

1993-01-26

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

2643281, 264327, 26432816, 26433111, B29C 4573

Patent

active

051820706

ABSTRACT:
A plastic part is molded of a plastic with an inner body of crystalline plastic and an outer surface layer of an amorphous plastic. The amorphous surface layer withstands friction loading at least during an initial break-in period. In one embodiment, the amorphous surface is formed by using a higher plastic melt temperature and/or or a lower mold temperature than normal. In another embodiment, an intermediate part is molded as a crystalline intermediate part, and a surface layer is heated and quenched to form the amorphous surface layer on the final part. A bearing cage is molded by injecting the plastic melt at a single point intermediate the ends of a single bar of the bearing cage to permit formation of the desired amorphous layer on rails connected to the ends of the bars.

REFERENCES:
patent: 1726902 (1929-09-01), Kerruish
patent: 3795382 (1974-03-01), Gruber et al.
patent: 4655983 (1987-04-01), Philby
patent: 4818462 (1989-04-01), Murano
patent: 4945152 (1990-07-01), Peerlkamp
patent: 4975479 (1990-12-01), Satake et al.

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