Piston ring forming method

Details Piston ring forming method Piston ring forming method

1975-01-10

1976-08-03

Truhe, J. V.

Electric heating

Metal heating

With forging or shaping

291566, 148150, 219 50, 219161, B21J 508, B23P 1506

Patent

active

039730980

ABSTRACT:
A method and apparatus for forming piston rings are disclosed. A split piston ring made by conventional processes is locally heated along its inside surface for a short distance either side of the split. This causes a short length of the ring on either side of the split to curl into a slight inward protrosion due to internal yielding of the restrained heated area and subsequent tensioning during cooling. The inwardly curved configuration prevents catching of the ring's ends on gas ports of ported cylinder engines.

REFERENCES:
patent: 458177 (1891-08-01), Lemp
patent: 746442 (1903-12-01), Bates
patent: 1295147 (1919-02-01), Flammang
patent: 1458248 (1923-06-01), Seifert
patent: 1783047 (1930-11-01), Marshall
patent: 2280552 (1942-04-01), Somes
patent: 3757413 (1973-09-01), Craik

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