Title:
METHOD FOR MANUFACTURING WIDE-MOUTHED METAL PIPE
Document Type and Number:
WIPO Patent Application WO/2016/104706
Kind Code:
A1
Abstract:
A method for manufacturing a wide-mouthed metal pipe from a hollow element tube having along the circumferential direction multiple regions with different deformation resistance, said manufacturing method having: a first step wherein a region for which the deformation resistance is relatively small is identified as a low deformation resistance section and a region for which the deformation resistance is relatively large is identified as a high deformation resistance section; and a second step wherein a pipe expansion punch is press-fitted into the hollow element tube so as to make the wall thickness reduction rate of the low deformation resistance section smaller than the wall thickness reduction rate of the high deformation resistance section.
Inventors:
IGUCHI KEINOSUKE (JP)
TAMURA SHOHEI (JP)
MIZUMURA MASAAKI (JP)
TAMURA SHOHEI (JP)
MIZUMURA MASAAKI (JP)
Application Number:
PCT/JP2015/086239
Publication Date:
June 30, 2016
Filing Date:
December 25, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D41/02; B21C37/15; B21C37/16
Foreign References:
| JP2009136897A | 2009-06-25 | |||
| JP2006272350A | 2006-10-12 | |||
| JP4798875B2 | 2011-10-19 |
Other References:
See also references of EP 3238849A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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