Method for making piston rings

Details Method for making piston rings Method for making piston rings

1998-09-18

2000-04-25

Mai, Ngoclan

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148230, 2988807, 29888074, 29557, C23C 824

Patent

active

060539887

ABSTRACT:
A method and apparatus for making a piston ring in which a metal strip having a first coefficient of expansion is coiled about a special mandrel having a second greater coefficient of expansion and a threaded form that has a zero helix angle along most of its circumference or perimeter and then a relatively steep helix angle for a short distance.

REFERENCES:
patent: 1018149 (1912-02-01), Wright
patent: 1450346 (1923-04-01), Anderson
patent: 2279133 (1942-04-01), Cross
patent: 2280552 (1942-04-01), Somes
patent: 2453330 (1948-11-01), Marshall
patent: 2748453 (1956-06-01), Haldeman
patent: 4937937 (1990-07-01), Bruce
patent: 5068963 (1991-12-01), Bruce

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