Method of producing oil seal

Details Method of producing oil seal Method of producing oil seal

1986-07-15

1988-02-09

Lowe, James

Metal working

Method of mechanical manufacture

Obtaining plural product pieces from unitary workpiece

29511, 29520, 264159, 264292, 264293, 264318, 277134, 277152, 425DIG47, B23P 1700, B29C 5902, B29D 100

Patent

active

047233508

ABSTRACT:
A method of producing an oil seal comprises the following steps: a slicing step in which a seal ring is sliced from an end of a tubular billet of a resin material in a predetermined axial thickness; a fixing step in which the radially outer portion of the seal ring is fixed in the support member; and a bending-out/thread-forming step in which the radially inner portion of the seal ring is bent out of the plane of the radially outer portion of the seal ring thereby forming a tubular seal lip, and sequentially after forming of this seal lip, a screw thread is formed on the inner peripheral surface of the tubular seal lip. The fixing step is conducted by a press having an upper die and a lower die, in which the seal ring is fixed in the support member. The bending-out/thread-forming step is conducted by the press in which the radially inner portion of the seal ring is deformed into the tubular seal lip, and a screw thread is formed on the inner peripheral surface of the tubular seal lip by means of a mandrel having a tap. The bending-out/thread-forming step may be conducted in advance of the fixing step.

REFERENCES:
patent: 2990206 (1961-06-01), Bagdon
patent: 3276114 (1966-10-01), Blaurock
patent: 3280238 (1966-10-01), Calvert
patent: 3490139 (1970-01-01), McKinven, Jr.
patent: 3613223 (1971-10-01), Bush
patent: 3857156 (1974-12-01), Clark
patent: 3929341 (1975-12-01), Clark
patent: 3985487 (1976-10-01), Clark
patent: 4464322 (1984-08-01), Butler

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