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无芯模旋压由于不受芯模限制,适合复杂曲母线工件的柔性旋压成形,但仍需一定的辅助支撑,以克服成形形状精度较差的问题。针对主辅旋轮的曲母线件无芯模旋压,运用仿真与实验相结合的方法分析其在有无端部辅助支撑、有无辅助旋轮支撑时的旋压效果,分别对仿真结果的应力、应变、轮廓形状和壁厚分布情况进行了探讨。结果表明,端部辅助支撑有助于提高整体弯折变形效果,辅助旋轮支撑有助于板料局部成形,复合辅助支撑则综合了两者的成形特性,可以得到满足成形质量的工件。另外,通过变进给和首道次预成形直线形状的两道次旋压成形方法,对成形质量进行改善,结果表明两种方法相结合可以明显提高最大减薄率,改善壁厚均匀度。
Due to not being limited by the mandrel, the coreless spinning method is suitable for the flexible spinning forming of complex curved busbar workpieces, but some auxiliary support is still needed to overcome the problem of poor precision of the formed shape. For the main and auxiliary rollers, the core and the core pieces are rotated with no core. The method of combining the simulation and the experiment is used to analyze the spinning effect of the auxiliary support with and without the aid of the auxiliary support. The stress of the simulation result , Strain, contour shape and wall thickness distribution were discussed. The results show that the end support helps to improve the overall bending and deformation effect. The auxiliary roller support helps to shape the sheet. The composite auxiliary support combines the forming characteristics of both to obtain the workpiece with the quality of forming. In addition, the forming quality is improved by changing the two-pass preforming linear shape of the first pass to the first pass. The results show that the combination of the two methods can significantly improve the maximum reduction rate and improve the thickness uniformity.