FEM Numerical Simulation On Power Spinning Of Cylindrical Workpiece

Modern spinning technology is an advanced plastic forming process and widely used in the field of precise processing technology of aerospace and military industry. Power spinning, one important part of spinning, has unique advantage when the thin wall tube of high precision, large slenderness ratio is made. It is became an important shaping method for flexible manufacturing of small-lot rotary thin-wall parts. For long the study of power spinning process was based on industrial experience. The reason of flaw produced in power spinning processing is not explained well. To study the forming law of power spinning, in this dissertation the power spinning was investigated by computer numerical simulation. A brief introduction of the project and the main results are as following:A new heating method is presented based on similar characteristic between the process of spinning and electrical contact and the model of academic analysis is built. This heating method has the characteristics of rapid heating and concentration and it can reduce the resource consumption and environment pollution.Based on analysis of the power spinning process of one roller, the boundary condition and the determination of load type are disposed effectively. The solid and shell element is used in discreting the blank and mandrel, roller respectively. The mechanical model, which fit well with the real process of tube spinning, is established.The process of tube spinning is simulated by 3D elasto-plastic FEM. The distribution of stress and strain is obtained. The results can well interpret these appearances of enlarging and reducing of diameter as well as deflection of generating line and build up etc.The tube spinning of deferent technological parameter is simulated. The influence law of various parameters on spinning force and equivalent stress is obtained and it provides theoretical evidence for determining the rational parameters and improving the dimensional accuracy of products.The process spinning of tube with longitudinal inner ribs is simulated. The distribution of stress and strain is obtained and compared with that of the process spinning of tube with no longitudinal inner ribs. The conclusion that they have the kindred distribution of stress and strain and the same deformation mechanism, isobtained.