Autofrettage process

Details Autofrettage process Autofrettage process

1981-07-30

1983-11-29

Larson, Lowell A.

Metal deforming

By application of fluent medium, or energy field

By kinetic energy of fluid or field

72 61, 29 111, 29446, B21D 2602

Patent

active

044174594

ABSTRACT:
An autofrettage process which relates to the autofrettage of thick-walled cylinders through the cyclical application of high pressure to the internal bore of the cylinder. The invention encompasses the autofrettage of cylindrical members in cyclical pressure stages each of a few seconds to a few minutes in duration during each of which the bore of the cylinder being autofrettaged is subjected to a pressure in the range of about zero to 100,000 psi and, preferably 40,000 to 100,000 psi. Preferably, the pressurizable hydraulic fluid medium utilized for the autofrettage is ethylene glycol or hydraulic oil, or any similar fluid which will not freeze or solidify at the pressures encountered during the inventive process.

REFERENCES:
patent: 1329762 (1920-02-01), Guy
patent: 1391009 (1921-09-01), Schneider
patent: 1495587 (1924-05-01), Grimm

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