Method and apparatus for making piston rings

Details Method and apparatus for making piston rings Method and apparatus for making piston rings

1998-03-26

1998-12-29

Pitts, Andrea L.

Metal working

Plural diverse manufacturing apparatus including means for...

Forging and bending, cutting or punching

29412, 29888073, 2988807, 72129, 140 88, 470 42, B23B 1100

Patent

active

058528598

ABSTRACT:
A method and apparatus for making non-circular piston rings which will precisely sealably conform to the cylinder wall of an internal combustion engine. In accordance with the method of the invention a metal strip of special cross-sectional configuration is coiled about a specially configured mandrel which is non-circular in cross section. Preferably the coiling mandrel is provided with a circumferentially interrupted thread form that has a zero helix angle along most of its circumference. During the coiling operation, using this type of mandrel, the metal strip is preformed at specific locations along its length into an angled configuration to form a coil body having a plurality of coils that have a zero helix angle along most of their circumference and a relatively steep helix angle for a short distance. After the coil is formed, the helix angle portions are cut therefrom to provide a plurality of generally planer, interrupted rings.

REFERENCES:
patent: 1018149 (1912-02-01), Wright
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patent: 2688346 (1954-09-01), England
patent: 2748453 (1956-06-01), Haldeman
patent: 3778877 (1973-12-01), Walker
patent: 4020878 (1977-05-01), Yashiro
patent: 4856105 (1989-08-01), Brocksieper et al.
patent: 5676008 (1997-10-01), Morin

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