Oval cross section metal tube producing device and producing...

Details Oval cross section metal tube producing device and producing... Oval cross section metal tube producing device and producing...

2007-05-22

2007-05-22

Tolan, Ed (Department: 3725)

Metal deforming

By extruding through orifice

With cutting

C072S256000, C072S267000, C072S273000, C072S370230, C072S379400

Reexamination Certificate

active

10522217

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.

REFERENCES:
patent: 2161752 (1939-06-01), Temple
patent: 2162776 (1939-06-01), Friden
patent: 2533942 (1950-12-01), Jongedyk
patent: 2979195 (1961-04-01), Martin
patent: 3415098 (1968-12-01), Daniels et al.
patent: 3839890 (1974-10-01), Phlippoteau
patent: 4200051 (1980-04-01), Nakahara et al.
patent: 2-65447 (1990-05-01), None
International Search Report, Nov. 11, 2003.

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