Key technology and equipment for local heating roll-forming of high strength square tube

The application of advanced high strength steel and the development innovation manufacturing technology is an effective way to realize the automobile lightweight and improve the safety performance design of high strength steel products. In this paper, a local heating "square to square" roll-forming process was proposed to solve the difficult problems of the introducing high strength steel into the traditional roll-forming equipment. Two kinds of inductors structure were compared and analyzed. Based on the "round to square" process, the size design of the rollers in forming process was deduced by the mutual relationship of the angle. And the relationship between the frame layout was given. The calculation of example and the key technical equipment were completed. Based on this new technology, the performance test of high strength tubes was carried out. It was found that the mechanical properties of the corner and the dimensional accuracy of the section are significantly improved. The research shows that this key technology and equipment of hot roll-forming can effectively overcome the problems of high strength steel. (paper)