Research On Power Spinning Forming Of Titanium Alloy Tube

For its light-weight, high strength, corrosion resistance, high temperature resistance and other unique advantages was widely used in aerospace, aviation, marine,chemical and other fields. During the power spinning, deforming zone was in the triaxial compressive stress state, which improved the plastic deformability of difficult to form materials. So, it very suitable for forming the rotational parts of titanium alloy. The spinning process is a very complicated plastic forming process. The process parameters are numerous and complex. The effect of parameters on power spinning is still not clear, so it is very necessary to research the forming process and parameter.According to the actual machining process and main technical parameters, ABAQUS software is applied to 3D numerical simulation of power spinning of aluminum alloy tube. Using accelerate computing technology, the stability of the finite element model was evaluated and compared to experimental results to improve the reliability of the model.The spinning wheel radius PThrough simulation analysis of power spinning process,the maximum value of stress and equivalent strain were in the contact with the roller and the blank zone. With the spinning process, the equivalent stress and equivalent strain were increased. The maxima equivalent stress and the max equivalent strain were increased in the beginning of spinning. The maxima equivalent stress and the max equivalent strain were changed smoothly in the stable phase. Systematically studied the effects of the structure parameters of the spinning wheel. The simulation indicates that the size of the spinning wheel angle α was mainly effect the equivalent stress, the more the spinning wheel angle α, the more equivalent stress. The spinning wheel radius P was mainly effect surface smoothness, large spinning wheel radius can ensure the smoothness of the material surface. The spinning wheel pressure step height H can be very good control the rising height. If you can set the H in the reasonable range according to the thickness of the material and the thinning rate, the high quality of spinning products can be produced.Quit angle of the spinning wheel β is less impact on the quality of spinning products, which mainly affect the spinning product release. Pressing angle of the spinning wheel αk should be as small as possible,if it does not interference the spinning. So it can as soon as possible to make the spinning in stable stage.The main process parameters on the spinning of the rough heating temperature, the feed rate, the spindle speed and the thinning rate were analyzed by the finite element analysis method. The titanium alloy tube spinning forming more reasonable parameters were obtained : the rough heating temperature of 650℃、the feed rate of 1mm/r、the spindle speed of 4r/s and the thinning rate of 20%. The tube distribution of the residual stress were analyzed, the analysis found that the diameter of tube of the equivalent residual stress distribution is uniform,the minimum value appeared in the first spinning area, and the maximum value appeared in the latest spinning area. The distribution of the residual strain was analyzed, the small size effect on the accuracy of the tube shape by the residual stress and temperature.