To provide a manufacturing method for a bent product which can secure high working accuracy and can provide a large bending angle without damaging the surface condition of a metal material even when a widely varying bent shape is desired or when it is necessary to perform bending of a high strength metal material.
A bent product having a three-dimensionally bent portion intermittently or continuously in the lengthwise direction is manufactured by supporting a steel pipe 1 at a first position A while feeding it 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 the position of a 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 the upstream side of the third position C in the feed direction of the steel pipe 1 to impart a bending moment to the heated portion of the steel pipe 1.
SHIMADA NAOAKI
INOUE SABURO
KUWAYAMA SHINJIRO
SUMITOMO PIPE & TUBE CO LTD
| JPS61249628A | 1986-11-06 | |||
| JP2007083304A | 2007-04-05 | |||
| JPS5938048B2 | 1984-09-13 |
| WO2008123505A1 | 2008-10-16 | |||
| WO2006093006A1 | 2006-09-08 |