Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuji Maeda0
Sigetomi Miyoshi0
Takahiro Yamaguchi0
Date of Patent
May 22, 2007
0Patent Application Number
105222170
Date Filed
July 25, 2003
0Patent Primary Examiner
Patent abstract
It is an object of the present invention to provide a novel aluminum tube of an oval cross section that has a wider range of applications and added values. A disk-shaped metal slug (21) is impact-extruded with the use of a die (14) and a punch (13) each having an optimally designed structure to form a metal tube (T) integrally including a mouth, a shoulder and a body of an oval cross section. A hem portion of the oval body of the tube (T) thus formed and hardened by the impact extrusion is once deformed into a circular shape, and then trimmed off by a turning operation.
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