| 摘要 |
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. |
