Deformation Analysis of TC6 Titanium Alloy Cylinder in Backward Extrusion
3D coupled thermal-mechanical model was established based on Lagrange multiplier method of rigid plasticity FE.Under different friction factor,punch velocity and deformation temperature,the load and distribution of stress and strain in backward extrusion for TC6 titanium alloy cylinder were numerically analyzed.The results show that the center blank produces compression deformation,the blank in edge produces shear deformation,and the deformation of the bottom of edge is most.The load increases slowly in the initial contact stage,and then it increases significantly.After deformation comes into the steady stage,the load changes slowly.With the increment of punch speed and friction force as well as decrease of deformation temperature,the load increases.When the speed of punch is 10 mm/s and deformation temperature is 900℃,the backward extrusion deformation of TC6 titanium alloy cylinder is even.