Title:
HOLLOW TUBE MATERIAL MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2017/134941
Kind Code:
A1
Abstract:
This method for manufacturing a hollow tube material involves: a step for arranging a steel tube, i.e., the raw material, inside of an outer mold having an inner surface of the same shape as the outer surface of the hollow tube material, at least partly separated from the inner surface; and a step for axially compressing the steel tube by reducing the relative distance between a pair of pressure molds that contact both axial end surfaces of the steel tube in a state in which a core portion, having an outer surface shape that is the same as the inner surface shape of both axial end portions of the hollow tube material, is inserted between the pair of pressure molds at least partly separated from the inner surface of the steel tube.
Inventors:
YOSHIDA HIROSHI (JP)
MIZUMURA MASAAKI (JP)
MORI YASUNORI (JP)
KUBOTA HIROAKI (JP)
MIZUMURA MASAAKI (JP)
MORI YASUNORI (JP)
KUBOTA HIROAKI (JP)
Application Number:
PCT/JP2016/087396
Publication Date:
August 10, 2017
Filing Date:
December 15, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21J5/08; B21J5/02; B21K1/10; F16C3/02
Domestic Patent References:
| WO2005102555A1 | 2005-11-03 |
Foreign References:
| JPH08243680A | 1996-09-24 | |||
| JP2007283399A | 2007-11-01 | |||
| JP2011121068A | 2011-06-23 |
Other References:
See also references of EP 3412375A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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