Method of making polytetrafluoroethylene sealing elements with h

Details Method of making polytetrafluoroethylene sealing elements with h Method of making polytetrafluoroethylene sealing elements with h

1975-02-04

1976-02-24

DiPalma, Victor A.

Metal working

Method of mechanical manufacture

Obtaining plural product pieces from unitary workpiece

29511, 29DIG15, 29DIG34, 264159, 264163, 264293, 264296, B23P 1700

Patent

active

039395510

ABSTRACT:
A method for manufacturing an oil seal element from polytetrafluoroethylene and the like. A tubular billet of polytetrafluoroethylene or the like is provided with an outer cylindrical surface of the desired diameter and an inner cylindrical surface approximating but slightly smaller than the desired 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 then 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.

REFERENCES:
patent: 1936804 (1933-11-01), Stein
patent: 3004297 (1961-10-01), Stover
patent: 3032825 (1962-05-01), Proud
patent: 3137935 (1964-06-01), Gachot
patent: 3207826 (1965-09-01), Yost
patent: 3268984 (1966-08-01), Kupchick
patent: 3549445 (1970-12-01), McMahon
patent: 3857156 (1974-12-01), Clark

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