Title:
METHOD AND APPARATUS FOR MANUFACTURING SPECIAL SHAPED TUBE STOCK FOR HYDRAULIC BULGING
Document Type and Number:
Japanese Patent JP3925370
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make the efficient production of taper tubes possible and to manufacture products having excellent quality in which weld defects are less than those in conventional products.
SOLUTION: Butting parts are welded in the state where a metallic sheet 23b is set to an O-bending die 25b after performing the final bending of the metallic sheet with a manufacturing apparatus for taper tubes, the circumference of which is arbitrarily changeable in the axial direction for hydraulic bulging which is provided with a forming device by bending and a welding device. By this invention, the securement of high accuracy of a welded joint is enabled and the quality of a product is improved. Moreover, an off-line welding machine is not required, so exclusive equipment and personnel required for welding are unnecessary and a lead time is shortened, so that the efficient production is enabled.
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Inventors:
Masanori Taiyama
Atsushi Tomizawa
Atsushi Tomizawa
Application Number:
JP2002273762A
Publication Date:
June 06, 2007
Filing Date:
September 19, 2002
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21C37/18; B21C37/08; B21D5/01; B23K9/025; (IPC1-7): B21C37/18; B21C37/08; B21D5/01; B23K9/025
Domestic Patent References:
| JP6170588A | ||||
| JP2000015474A | ||||
| JP10193155A | ||||
| JP53001165A |
Attorney, Agent or Firm:
Mizogami Mitsuyoshi
Tetsuya Mizogami
Yoshinori Iwahara
Tetsuya Mizogami
Yoshinori Iwahara
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