Title:
PRODUCTION METHOD FOR HOLLOW MEMBER
Document Type and Number:
WIPO Patent Application WO/2022/014262
Kind Code:
A1
Abstract:
Disclosed is a production method with which it is possible to prevent crinkle formation and buckling distortion caused by bending, when bending processing and cross-section processing are applied to a pipe by using a press die. A production method according to the present invention comprises applying pressure, on a curved pipe having a bent section, from the outside of the pipe toward the inside thereof using a press die so as to simultaneously perform both cross-section processing on the bent section and bending processing that achieves a small bending radius of the bent section.
Inventors:
TAMURA SHOHEI (JP)
Application Number:
PCT/JP2021/023260
Publication Date:
January 20, 2022
Filing Date:
June 18, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D7/06; B21D22/02
Domestic Patent References:
| WO2006106622A1 | 2006-10-12 | |||
| WO2016052644A1 | 2016-04-07 |
Foreign References:
| JPS5410265A | 1979-01-25 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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