Piston rings

Details Piston rings Piston rings

1990-07-10

1991-12-03

Cuchlinski, Jr., William A.

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

2988807, 277216, 277217, B23B 526

Patent

active

050689630

ABSTRACT:
In the manufacture of a piston ring an intermediate ring is produced by bending a metal strip first to a smaller radius of curvature than required and then bending the metal strip again to increase its radius of curvature. The first and further bends are chosen to produce an intermediate ring, whereby the intermediate ring does not change shape when subjected to stress-relaxation temperatures, and has the required shape for the piston ring.

REFERENCES:
patent: 2111574 (1938-03-01), Solenberger
patent: 2453330 (1948-11-01), Marshall
patent: 2654977 (1953-11-01), Squibb et al.
patent: 2748453 (1956-06-01), Haldeman
patent: 3608347 (1971-09-01), Kemminer
patent: 3757413 (1973-09-01), Craik
patent: 3805352 (1974-04-01), de Montremy
patent: 4497102 (1985-02-01), Ikatake
patent: 4937937 (1990-07-01), Bruce
Metals Handbook, Ninth Edition, vol. 4, Heat Treating, "Control of Distortion in Tool Steels", pp. 614-620 (date unknown).

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