Research On The Power Spinning Of Cone Parts With Discontinuous Wall Thickness Using 3D FEM And Experimental Investigation

The advent of the spinning of high-strength and high-precision cone parts with discontinuous wall thickness adapt to the increasing demand of aeronautic, aerospace and military industry. Research on the deformation mechanism and deformation laws of the power spinning of cone parts with discontinuous wall thickness is a key problem urgently to be solved for the research and development of the technology. In the dissertation, based on elasto-plasticity mechanics, using experiments and finite element method (FEM), the mechanism and law of spinning of discontinuous wall thickness have been a brief introduction to the project and its main results are as follows:At first, based on the elasto-plastic dynamic FEM platform ABAQUS/Explicit, a 3D FEM model of the power spinning of cone parts with discontinuous wall thickness has been developed. The establishment of the model lays a foundation for the research on the deformation mechanism and the influencing laws of forming parameters on the process.Second, based on the model established above, the distribution and variation features of the stress and strain during the process have been obtained. During the forming process, a typical three-dimensional compression stress zone lies in the place contacting with roller; The hoop tension stress lies in other zones. The normal compressive stress lies in the formed place and unformed place. In front of the roller, the generatrix compressive strain appears a ring, and its value decreases; a hoop tension strain ring lies in the place contacting with roller, the tension strain value reduces when the thin wall zone formed, the value increases at first and then reduces when the thick wall zone formed. In front of the roller, there is a normal tension strain ring, and its value increases in the former stage and reduces again with the process.Third, the influence laws of the roller radius and the hemicone angle, on the power spinning of cone parts with discontinuous wall thickness have been revealed. The results show that: the increase of the roller radius, the compressive strain ring lies in the place contacting with roller and its value grows up; the increase of the hemicone angle, the value of tension strain decreases while the thick wall zone formes and it...