Method for making a polymer part having an amorphous surface lay

Details Method for making a polymer part having an amorphous surface lay Method for making a polymer part having an amorphous surface lay

1992-06-29

1993-06-29

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

26432814, 26432816, 26433111, B29C 4572, B29C 4573, F16C 3356

Patent

active

052232034

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 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:
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patent: 3028204 (1958-10-01), Schaeffler
patent: 3388952 (1968-06-01), Schaeffler
patent: 3666612 (1972-05-01), Angelo
patent: 3733111 (1973-05-01), Harlan et al.
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patent: 4339374 (1982-07-01), Olschewski et al.
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patent: 4934841 (1990-06-01), De Vito
patent: 4997295 (1991-05-01), Saitou
patent: 5032339 (1991-07-01), Farraye-Callahan et al.

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