| 摘要 |
PURPOSE:To form a straight line type steel in the curved shape steel of the prescribed shape without residual stress and material deterioration by guiding along the circular arcuate locus by pushing with heating by high frequency induction in narrow width the outer periphery of the bend part start end of a straight line type steel and by performing a rapid cooling immediately after the heating as well. CONSTITUTION:A linear steel is placed on a roller conveyor 8 and pushed in the longitudinal direction by a feeding device 9. The bending guide is performed along the curvature of the prescribed arm 13 length by holding with a chuck 14 the projecting shape steel with heating n narrow width the shape steel outer periphery with the high frequency induction heating coil 10 which is located at the conveyor 8 end part. A rapid cooling is performed immediately after the heating by a fountain 11.
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