Metal deforming – By extruding through orifice – With metal-deforming other than by extrusion
Patent
1997-03-10
1998-12-15
Hail, III, Joseph J.
Metal deforming
By extruding through orifice
With metal-deforming other than by extrusion
722531, B21C 2300
Patent
active
058485457
ABSTRACT:
An extruded material for expansion working comprising a main body having at least a plurality of straight portions and arcuate corner portions formed between the neighboring straight portions in cross section, and an imitation forming an annular polygon by coupling portions of said main body, wherein said corner portions have a radius of curvature (R) at the center in the direction of thickness of from 5 to 40 mm, and an inner angle (.theta.) formed by the neighboring two straight portions is from 90.degree. to 125.degree.. The imitation is removed and, then, the corner portions are expansion-worked into a flat plate.
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patent: 4428218 (1984-01-01), LaRocca
patent: 4967473 (1990-11-01), Wessel
A guide to Aluminum Extrusions, The Aluminum Assoc., Inc., May 1979.
Patent Abstracts of Japan, vol. 004, No. 154, Oct. 28, 1980 and JP 55 106625 A.
Hail III Joseph J.
Showa Aluminum Corporation
Tolan Ed
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