Title:
OVAL CROSS SECTION METAL TUBE PRODUCING DEVICE AND PRODUCING METHOD
Document Type and Number:
WIPO Patent Application WO/2004/011167
Kind Code:
A1
Abstract:
It is intended to attain the widening of the range of applications and the enhancement of added value of metal tubes, etc., by obtaining an aluminum tube of oval cross section that has never existed before. To this end, a disk-like metal slag (21) is impact-extruded by a structurally optimum-designed mold (13, 14) to thereby mold a metal tube (T) having a mouth, shoulder and oval cross section barrel formed integral. And the skirt of the oval cross section barrel of the molded tube (T) is once shaped into a perfect circle by utilizing the principle of work hardening of metal and then it is subjected to trimming by lathing.
Inventors:
Maeda, Yuji c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Miyoshi, Sigetomi c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Yamaguchi, Takahiro c/o Taisei Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Miyoshi, Sigetomi c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Yamaguchi, Takahiro c/o Taisei Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Application Number:
PCT/JP2003/009419
Publication Date:
February 05, 2004
Filing Date:
July 25, 2003
Export Citation:
Assignee:
TAISEI KAKO CO., LTD. (12-20, Honjonishi 2-chome Kita-k, Osaka-shi Osaka, 531-0073, JP)
Maeda, Yuji c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Miyoshi, Sigetomi c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Yamaguchi, Takahiro c/o Taisei Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Maeda, Yuji c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Miyoshi, Sigetomi c/o Taisei Kako Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
Yamaguchi, Takahiro c/o Taisei Co. LTD. (11-6, Fujinosato 2-chom, Ibaraki-shi Osaka, 567-0054, JP)
International Classes:
B65D35/06; B21C23/00; B21C23/08; B21C23/18; B21C23/21; B21C25/02; B21J5/06; B21K21/04; B30B5/00; (IPC1-7): B21C23/18
Attorney, Agent or Firm:
Murakami, Taro (Murakami Intellectual Property Law Office, Information Center BLDG. 301 1-26,
Ikutamamaemachi, Tennoji-k, Osaka-shi Osaka, 543-0072, JP)
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