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

Due to the compliable factors of the large head shell multi-pass spinning process, the simply theoretical analysis method could not solve the accurately grasp and practical problems. Further, the laboratory researches not only difficulty to approve, but also hard to giving a general inquires and principle guidelines, moreover, this method cost amount of resources and labour consume, it also extend the processing period. According to new technology on aviation, aerospace and nuclear, the deformation structure materials and the thick walled complex allocation are wildly used in modern world; the problem of large head shell multi-pass spinning process is more and more hard. In this situation, to achieve the effective research method study on the different roller fillet radius, installation angle, friction coefficient and feed parameters under the action of multi-pass spinning of large heard shell than the forming mechanism is more urgently now, especially the deformation, stress and strain distribution large head shell multi-pass spinning, so it can provide theoretical basis for selection of process parameters properly.Based on the model I talked above, we obtain the pressure strain, thickness distribution and the variation characteristics in the forming process of the large thick wall head multi-pass spinning. With the forming process, it shows the pressure strain trend to its maximum during the process of the multi-pass spinning, also, the maximum figure trend to connect with the blank place (forming zone). Following the distribution of the main line, the thickness of the wall is decreasing, its shows the minimum figure in the connection area between spinning wheel and blank zone. Resilience shows merely influence on changing strain and distribution of thickness of wall, but shows the critical influence on distribution of stress. According to this result, it shows the principle and regulation of some factors influence on large thick wall head spinning forming process in the first pass spinning of the stress and strains, these factors include position angle, friction coefficient and spinning roller’s feed ratio.The result shows the position angle has merely influence on changing strain and the thickness of the wall but critically influence on the diameter of the parts, the thickness of the part will increase and well distributed with the increasing of the friction coefficient. In contrary, with the extending of the diameter of parts, the thickness of the wall shows opposite results.Further, the study shows the relationship between the coefficient and the feed ration which influence on the large thick wall head, second and three pass spinning of the stress and strain, as well as the difference of diameter changes. The result shows, the maximum figure of thickness of the parts stay on the average level, the minimum figure of thickness of the parts decrease after its peak level, the difference of the changes increasing after its bottom, the difference of diameter decrease after its peak level. Also the result shows the changes influenced by the feed ratio, when the feed ration increase, the maximum figure of the thickness of wall increase first and then decrease, the diameter difference increase first and then decrease. All these figures provide a theoretical basis for the determination and optimization of the process parameters.