公开(公告)号：AU1250392A

公开(公告)日：1992-11-02

申请号：AU1250392

申请日：1991-11-25

Applicant: THE TORRINGTON COMPANY

Inventor： KEITH L SEIFERT ,  ROBERT E FURST

IPC: B29C45/00 ,  B29C71/02 ,  B32B27/00 ,  C08J7/00 ,  F02B61/04 ,  F02B75/02 ,  F16C33/44 ,  F16C33/56

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.