PRODUCTION METHOD FOR SHAPED STEEL CHANGING CROSS-SECTIONAL SHAPE IN LONGITUDINAL DIRECTION, AND ROLL MOLDING DEVICE

摘要

A roll molding device for roll molding for producing, from a sheet material, shaped steel that changes cross-sectional shape in the longitudinal direction, comprises: a first metal roll having an annular ridge section having a cross-sectional shape that changes in the peripheral direction; a second metal roll having an annular groove section having a cross-sectional shape that changes in the peripheral direction; and a drive device for the first metal roll and the second metal roll. A flank is provided across at least a transition section of the side surface of the annular ridge section of the first metal roll, such that a gap to the side surface of the annular groove section of the second metal roll widens inwards in the radial direction.