Coupled Thermo-mechanical FE Simulation of Unloading Cooling Springback in NC Heating Bending of Large Diameter Thin-walled Commercial Pure Titanium Tube

AbstractA new FE model of unloading cooling springback in the NC heating bending of large diameter thin-walled commercial pure titanium tube was developed by combination of stress-strain field and temperature field. With the commercial pure titanium tube of Ф50.8×t0.508×R101.6mm as a representative component, the springback behaviours under different processing conditions were investigated. The results show that: 1) The springback angle increases slowly along with temperature increasing. With the temperature at 180-250°C, the springback angle is least. 2) The heating temperature has certain influence on the cross section distortion. With temperature at 180-300°C, forming quality is better. 3) The mandrel diameter has important influence on the cross section distortion. With the increasing of the mandrel's diameter, cross section distortion rate and outside deformation is more uniform