Method of making polytetrafluoroethylene sealing elements...

Details Method of making polytetrafluoroethylene sealing elements... Method of making polytetrafluoroethylene sealing elements...

B - Operations, Transporting

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D

18/109

B29D 99/00 (2010.01) B23P 15/00 (2006.01) B29C 59/02 (2006.01) F16J 15/32 (2006.01)

Patent

CA 1078119

Abstract of the Disclosure A method for manufacturing an oil seal element from poly- tetrafluoroethylene and the like. A tubular billet of polytetrafluoro- ethylene or the like is provided with an outer cylindrical surface of the desired outer diameter and an inner cylindrical surface approximating but slightly smaller than the desired inner diameter, and an end wall is faced off perpendicular to the cylindrical surfaces. A series of washers of a desired thickness is then sliced from the billet. The flat washer is then first assembled with a metal case and than a desired hydrodynamic shape, such as a spiral groove, is coined in. Preferably, the inner pierce is completed at this time. Each washer may then be formed under pressure to permanently deform the radially inner portion thereof to a frustoconical shape. The assembled seal may be held on a shaft-size mandrel during application of a coating to the metal case.

244891

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