3D FE Analysis On Deformation Mechanism And Laws Of Multi-pass Spinning Of Large Complex Thin-walled Shell

A large complex thin-walled shell is a kind of important hollow rotary parts, widely used in aerospace, aeronautics and military industry. Because of the limitation of material forming limit and other factors, it is necessary to produce this kind of parts by multi-pass spinning technology. Research on the deformation mechanism and deformation laws of the multi-pass spinning of large complex thin-walled shell is a key problem urgently to be solved for the research and development of the spinning technology. So, in this dissertation, based on ABAQUS/Explicit & Standard, a 3D FEM model of this forming process is established firstly, and then the deformation mechanism and the influencing laws of technological parameters on the process are investigated. A brief introduction to the project and its main results are as follows:At first, a 3D Elasto-plastic FEM model including springback and annealing operation of multi-pass spinning of large complex thin-walled shell has been developed. Both computation accuracy and efficiency are taken in account, and some key technologies during the establishing process of the model have been solved. The model has been tested to be reliable. 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.Then, based on the model established above, the distribution and variation features of the stress and strain, the wall thickness during the process of multi-pass spinning of the large complex thin-walled shell have been obtained. In the forming process, the maximal stress and equivalent plastic strain, which lie in the zone contacting with rollers all the time, increase during multi-pass spinning process. The wall thickness decreases gradually along generating curve of parts from its bottom to opening, and the wall thickness at the place which rollers contact with blank is the thinnest. Springback has no dramatic effect on equivalent plastic strain and wall thickness but brings about notable influence on stress.Further more, the influence laws of roller setting angle, friction coefficient between roller and blank and feed rate of roller on stress, strain, the wall thickness and diameter difference have been revealed during the first pass spinning process of large complex...