Title:
断面楕円形金属チューブ、及び、その製造装置並びに製造方法
Document Type and Number:
Japanese Patent JP4145594
Kind Code:
B2
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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Inventors:
Yuji Maeda
Miyoshi Shigetomi
Takahiro Yamaguchi
Miyoshi Shigetomi
Takahiro Yamaguchi
Application Number:
JP2002218381A
Publication Date:
September 03, 2008
Filing Date:
July 26, 2002
Export Citation:
Assignee:
Taisei Kako Co., Ltd.
International Classes:
B21C23/18; B65D35/06; B21C23/00; B21C23/08; B21C23/21; B21C25/02; B21J5/06; B21K21/04; B30B5/00
Domestic Patent References:
| JP60108126A | ||||
| JP57081919A | ||||
| JP51078252U | ||||
| JP2065447U |
Foreign References:
| US2979195 | ||||
| US2161752 |
Attorney, Agent or Firm:
Taro Murakami