Patent ID: 9457390
Filing Date: 2016-10-04
CPC Classification: B21D

Claim Text:
1. A manufacturing method for a bent member characterized by carrying out bending of a hollow metal blank having a closed cross section with satisfying the following conditions 1-6: Condition 1: a first manipulator grips a first portion of the metal blank located on the side of a first end thereof in a fixed manner; Condition 2: a second manipulator supports a high-temperature area forming mechanism which heats a region of the metal blank which is located between the first portion and a second portion located on the side of a second end of the metal blank and then performs cooling, thereby forming a high-temperature area in a portion of the region; Condition 3: a third manipulator grips the second portion of the metal blank; Condition 4: the first manipulator while fixed to the first portion moves two-dimensionally or three-dimensionally such that a bending moment can be imparted to the high-temperature area; Condition 5: the third manipulator intermittently moves in the axial direction of the second portion of the metal blank or moves two-dimensionally or three-dimensionally such that a bending moment can be imparted to the high-temperature area; and Condition 6: relative movement of the high-temperature area forming mechanism with respect to the metal blank in its axial direction is produced.