MANUFACTURING METHOD AND MANUFACTURING APPARATUS FOR BENT PRODUCT

Japanese Patent JP2015098060

A

PROBLEM TO BE SOLVED: To provide a manufacturing method for a bent product which can secure high working accuracy and can provide a large bending angle of bending processing without damaging a surface condition of metal material even when a widely varying bent shape is desired or when it is necessary to perform the bending processing of high strength metal material.SOLUTION: A bent product having a three-dimensionally bent portion intermittently or continuously in a lengthwise direction is manufactured by: supporting a steel pipe 1 at a first position A while feeding the steel pipe 1 in the lengthwise direction; locally heating the steel pipe 1 being fed at a second position B; cooling the heated portion of the steel pipe 1 at a third position C; and changing a position of gripping means 15 which grips the steel pipe 1 in a region D downstream of the third position C, into a three-dimensional direction including the feed direction of the steel pipe 1 in a workspace including a space on an upstream side of the third position C in the feed direction of the steel pipe 1; and imparting a bending moment to the heated portion of the steel pipe 1.

WO/1985/000023	PIPE DEFORMING METHOD AND APPARATUS
JPS5950887	[Title of the device] The frame of a motorcycle, or the bending part structure of a fork

TOMIZAWA ATSUSHI
SHIMADA NAOAKI
INOUE SABURO
KUWAYAMA SHINJIRO

JP2015038972A

May 28, 2015

February 27, 2015

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NIPPON STEEL & SUMITOMO METAL CORP
NIPPON STEEL & SUMIKIN PIPE CO LTD

B21D7/16; B21D7/00

JP2007301587A	2007-11-22
JP2004249304A	2004-09-09
JPH02179313A	1990-07-12
JP2001293521A	2001-10-23
JP2006326667A	2006-12-07
JPS5938048B2	1984-09-13
JPH05212450A	1993-08-24

WO2008123505A1	2008-10-16
WO2006093006A1	2006-09-08

Masaki Ichihara
Hideki

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