Development in Cad for Cold Roll Forming

In order to estimate the number of roll passes necessary to form the light gage steels for general structure, relation between the shape factor and the number of roll passes for various sections is investigated by arranging the data collected from several companies. We can obtain a good relation for symmetrical, asymmetrical and wide profile section, and optimum downhill curve and optimum downhill height for pipes are obtained. Furthermore, allotment of roll bend angle at any stage was carried out under the hypothesis that the locus of the edge of the section on the horizontal plane was the modified cubic curve. The roll flower for deck plates, keystone plates and pipes designed by these data base agreed well with actual roll drawing.