Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MOTHER PIPE FOR HYDRAULIC BULGING, HYDRAULIC BULGING DEVICE USING THE SAME, HYDRAULIC BULGING METHOD, AND HYDRAULICALLY BULGED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2005/070582
Kind Code:
A1
Abstract:
A mother pipe (TP2) for hydraulic bulging having such a peripheral length that an outer diameter is gradually increased or decreased from one to the other end thereof in the axial direction, wherein holding parts (TP2a, TP2b) having the peripheral length increasing toward the end face of the pipe on the one end are formed at least on the one end. A parallel part may be formed on the other end where the holding part is not formed. In a method and a device for bulging using the mother pipe, even when the mother pipe having a cross sectional shape largely varying in the axial direction is used, the push- bulging from the end of the pipe in the axial direction is allowed. Thus, a hydraulically bulged product to which hydraulic bulging is applied can obtain an expanding ratio larger than before.

Inventors:
Tomizawa, Atsushi c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Application Number:
PCT/JP2004/000507
Publication Date:
August 04, 2005
Filing Date:
January 21, 2004
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
SUMITOMO PIPE & TUBE CO., LTD. (3-5 Oaza Hikari, Kashima-shi, Ibaraki, 314-0014, JP)
MITSUBISHI JIDOSHAKOGYO KABUSHIKI KAISHA (16-4, Konan 2-chome Minato-k, Tokyo 10, 10884, JP)
Tomizawa, Atsushi c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
International Classes:
B21D26/045; B21D51/26; (IPC1-7): B21D26/02
Domestic Patent References:
WO1998051428A1
Foreign References:
JPS5273168A
JP2000301249A
JP2001321842A
JP2000045767A
JPS62199232A
JP2003001336A
JPS55154616U
JPS57165134A
Attorney, Agent or Firm:
Mori, Michio (M. MORI PATENT OFFICE Amagasaki Building, Amagasaki Building 17-23, Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, 66008, JP)
Download PDF: