Title:
METHOD FOR MANUFACTURING BEND MEMBER, AND HOT BENDING DEVICE FOR STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2016/031970
Kind Code:
A1
Abstract:
A method for manufacturing a bend member, the method having: a feeding step for feeding a long steel material along a longitudinal direction with one end part of the steel material at the front; a heating step for performing high-frequency inductive heating on one longitudinal-direction portion of the steel material by feeding high-frequency power to form a high-temperature part; a bending step for applying a bending moment in an arbitrary direction on the high-temperature part and forming a bend part; and a cooling step for spraying a cooling medium on the bend part and cooling the bend part. The feed speed is set below V1 and the high-frequency power is set below Q1 in the bending step during forming of a bend part in which a ratio R/W is equal to or less than a prescribed value, where V1 is the feeding speed of the steel material, Q1 is the high-frequency power supplied during forming of the high-temperature part in the steel material during forming of a bend part having a ratio R/W that exceeds a prescribed value is formed, and R/W is the ratio obtained by dividing the bend radius R[mm] of the bend part on the centroid line of the steel material by the dimension W[mm] in the bend direction in a cross-section of the steel material orthogonal to the centroid line.
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Inventors:
TOMIZAWA ATSUSHI (JP)
KUBOTA HIROAKI (JP)
SHIMADA NAOAKI (JP)
KUBOTA HIROAKI (JP)
SHIMADA NAOAKI (JP)
Application Number:
PCT/JP2015/074452
Publication Date:
March 03, 2016
Filing Date:
August 28, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D7/16
Domestic Patent References:
| WO2010050460A1 | 2010-05-06 | |||
| WO2011007810A1 | 2011-01-20 |
Foreign References:
| JP2012228714A | 2012-11-22 | |||
| JPS6218245B2 | 1987-04-22 | |||
| JPH11290955A | 1999-10-26 | |||
| JP4825019B2 | 2011-11-30 |
Other References:
SATORU MAJIMA ET AL.: "Application of Tube Hydroforming to Automotive Parts", JIDOSHA GIJUTSU, vol. 57, no. 6, June 2003 (2003-06-01), pages 23 - 28
See also references of EP 3195948A4
See also references of EP 3195948A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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