METHOD FOR PRODUCING POLYGONAL CLOSED CROSS-SECTION STRUCTURAL COMPONENT WITH A CURVED FORM AND POLYGONAL CLOSED CROSS-SECTION STRUCTURAL COMPONENT PRODUCED BY THIS METHOD

摘要

(PROBLEM TO BE SOLVED BY THE PROBLEM) Provided is a technique of press molding a polygonal closed end surface structural component having a bent shape into a single sheet of metal. The present invention relates to a method of manufacturing a polygonal closed end face structural component having a flange portion having a bent shape along a longitudinal direction and extending along a ridgeline located radially innermost in a curved shape, Sectional shape that is cut at a position of the innermost ridge and each end has a ridge line and a flange portion extending along the ridge line and has a plurality of ridges corresponding to corner portions of the polygonal closed end face of the component, Shaped main product having a radius of curvature equal to or smaller than a radius of curvature of a corresponding ridge line of each of the parts is press-molded, and subsequently, And press-molded so as to be deformed inward in the cross-sectional direction at one or more positions, And the ridges and the flanges are brought into contact with each other.