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采用空心旋压工艺成形凹圆弧母线筒形件难度很大。利用有限元模拟手段对该成形过程进行预测性研究,为后续的实验与生产提供理论依据。首先理论推导单一道次凹圆弧型旋轮运动关系方程,再以此为边界条件进行模拟。研究中提出了3种旋压方法,通过对比分析模拟结果发现,随动芯轴可控制筒坯自由端金属流动均衡性,多道次成形由于每一道次的相对径向进给量小,有利于控制弧顶部位的褶皱,获得较好的壁厚均匀性,且旋压件弧顶横截面椭圆化较轻。
It is very difficult to form concave arc bus bar by hollow spinning process. The finite element simulation method is used to forecast the forming process, which provides a theoretical basis for the subsequent experiments and production. First of all, the theoretical equation of circular arc motion of single-circular concave circular arc was deduced theoretically, and then used as the boundary condition to simulate. Three kinds of spinning methods were proposed in this study. By comparing the results of simulation, it was found that the follower mandrel can control the metal flow equilibrium at the free end of the billet. Due to the small relative radial feed per one pass, Which is conducive to controlling the wrinkles on the top of the arc, obtaining better wall thickness uniformity, and less elliptical cross-section of the top of the spinning component.