Numerical Simulation And Technological Optimization For Forging Process Of Titanium Alloy Equilibrium Elbow

Equilibrium elbow is a kind of important forged pieces in an armored vehicle.Based on the system study of deformation characters of a new titanium alloy TC27 and virtual orthogonal experiments, taking the fill up of finish forging die cavity and deformation uniformity as objective function, the metal flow behavior in forging process has been analyzed with the virtual orthogonal experiment that combined with the thermodynamic coupled three-dimensional finite element numerical simulation and orthogonal experiment. Then its process parameters were optimizing, it provided a sound basis for the determination of process parameters and improvement of as-forged quality in forming process.In order to realize the simulation goals, the orthogonal simulation experiment optimization method is applied. The seven factors, shape and size of intermediate billet,mould temperature, friction factor, initial forging temperature, pressing speed, are identified in the orthogonal simulation experiment. Each of these factors determines 3levels. In doing this, an orthogonal simulation experiment sheet, whose size is L18(37),is acquired. Depending on the experimental scheme, the orthogonal simulation experiment is performed. Notable factors and the range of levels were obtained according to the results of orthogonal experiment was conducted to get the optimal process system. Taking the influence rules and the order in to consideration, the optimal assembly parameter is picked up.According to the optimization design, the optimal parameters are obtained as follows: the shape and size of intermediate billet was determined as S2, the mould temperature is 250 ℃, the friction factor between mould and workpiece is 0.3, the initial forging temperature of bending die is 835℃, the initial forging temperature of finish forging die is 820℃, and the pressing speed of bending and finish forging are0.05m/s and 6m/s, respectively.