Abstract:

The difference between the offset spinning and the conventional symmetric spinning is analyzed.The numerical simulation based on a 3 D FEM (Finite Element Method)model is then carried out for the offset tube neck·spinning by using ANSYS,and the dynamic boundary and the frictional contact problems during the simu-lation are also solved.The transient stress distribution in the contact area,the deformed workpiece mesh,the distributions of stress& strain and the axial extension are thus obtained. Moreover.some common phenomena and defects in the offset spinning are analyzed.Simulated results indicate that the offset spinning with obvious non-ax isymmetric form ing parameters is different from the conventional symmetric spinning and the correspon-ding deform ation mechanism is influenced by many parameters such as the spinning style,the offset distance,the feed rate,the roundness radius of the roller,the namely pass reduction and the tube thickness.Experimen-tal results show that form ing parameters greatly influence the spinning force and workpiece quality of the conven-tional symmetric spinning.The influences of various parameters on the spinning force and workpiece quality of the offset spinning are finally discussed based on the experimental results.

Key words: offset tube neck-spinning, ANSYS, numerical simulation, non-ax isymmetrie distribution, experi-mental investigation