Process for producing hollow aluminum extrudates for use in a hi

Details Process for producing hollow aluminum extrudates for use in a hi Process for producing hollow aluminum extrudates for use in a hi

1983-06-16

1986-04-01

Combs, E. Michael

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

722531, 72269, B21C 2300

Patent

active

045789738

ABSTRACT:
A process for producing a hollow aluminum extrudate for use in a vacuum comprising the steps of hermetically closing the forward open end of a hollow shaped material immediately after extrusion, subsequently extruding a predetermined length of shaped material, cutting off the predetermined length of extruded material and hermetically closing the cut end thereof at the same time, and cutting off the closed ends. During extrusion, the inner surface of the hollow portion of the shaped material is substantially held out of contact with the atmosphere to inhibit a hydrous oxide on the inner surface while permitting formation of a compact oxide film thereon.

REFERENCES:
patent: 3243984 (1966-04-01), Hoffmann et al.
patent: 3808865 (1974-05-01), Wagner et al.
patent: 4165625 (1979-08-01), Wagner et al.
patent: 4165627 (1979-08-01), Boshold
patent: 4316373 (1982-02-01), Zilges et al.

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