| Multi-pass conventional spinning is a forming process of rotating parts.In recent years,the researchers have studied the wall thickness distribution,wrinkling phenomenon,spinning pressure distribution and other characteristics of multi-pass conventional spinning forming parts by means of experimental method and numerical simulation,and have optimized the process parameters,However,there is no systematic analysis of the mechanism of wrinkling and rupture during the spinning process.At present,the mid-pass design of multi-pass conventional spinning mostly depends on the experience of engineers and lacks clear theoretical basis,and there is no common method for the mid-pass design of curved busbar parts.The design of spinning trajectory is the most important point of spinning process parameters,and will directly determines the successful completion of the forming process.Non-axisymmetric spinning is an extension of the traditional spinning technology and has become one of the research hotspots in the field of plastic forming.The research of this kind of technology is still at the initial stage.By design many sorts of equipment,the researchers at home and abroad have found that it has many different points in deformation characteristics compared with ordinary spinning.However,the research on multi-pass non-axisymmetric spinning is still scarce.Its forming mechanism and process planning have not been studied in depth.Under the support of one project of the National Natural Science Foundation of China(NSFC)titled "the compound double-point hybrid method of multi-field coupling of heterogeneous metal plates and the mechanism of interface simultaneous deformation connection",this article studied the forming mechanism of multi-pass conventional spinning and multi-pass non-axisymmetric spinning in the way of theoretical analysis and experimental research.A parametric tool path generation method is proposed,which provides a new idea for digital spinning technology. |
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