Bend forming and defect simulation of nonuniform thickwall pipe
                                                                             MU Shuzhi 1, DU Chunjiang2
（1.School of Mechanical & Electronical Engineering, Jinling Institute of Technology, Nanjing 211169, China;2.China Nanjing Research Institute of Electronics Technology, Nanjing 210039, China）

Abstract: In order to solve the problems of bend forming and springback simulation of nonuniform thickwall pipe used in largescale power equipment, simulation was done with the explicit finite element analysis software ANSYS/LSDYNA, gave important reference to the design of bending equipment. In view of the problem of abnormal deformation and torsion happened in the bending process, a method was presented to eliminate the forming defect by using double top stampers structure, and adjusting the distance between two top stampers was discussed. The results show that the local abnormal deformation and torsion problem could be solved by the above two methods effectively.

Key words: bend forming; forming defect; simulation