Abstract: Characters of bend forming in automotive body parts are studied and the one step forming inverse FEM is improved. An algorithm of the initial guess based on locus line spreading, which is composed of fixed points on section line, has been developed and applied to the simulation scheme of one step forming. Then two practical examples of railcar and wing blank are cited. Comparison between experimental results and simulated ones show the validity of the algorithm.

Key words: Bend forming, Inverse finite element method Locus, line of fixed points