薄壁锥形件旋压成型中应力、应变场的有限元分析

Finite Element Analysis of Stress and Strain Field in Thin-wall Taper Workpiece During Spinning Forming

应用大型有限元分析软件ANSYS10.0建立了薄壁锥形工件旋压成形的有限元模型,以显式动力学求解器LS-DYNA为基础模拟了其旋压成形过程,分析了工件成形过程中的变形和应力特点,研究了应力和应变等因素对工件成形质量的影响规律。结果表明:应力、应变图显示了成形过程中工件应变和应力的分布特点与规律,为解决工件旋压成形过程中的问题提供了依据;旋压数值模拟有助于发现旋压变形中存在的旋压成形中容易产生断裂、翻边、褶皱和失稳等缺陷问题及产生的原因;旋压力振荡和减薄率过大是工件旋压断裂的主要因素;在旋压工艺中可以通过优化减薄率、转速和进给量等工艺参数有效控制锥形工件旋压成形质量;分析结果对于旋压模具的优化设计和旋压工艺参数合理选择提供了可靠的理论基础。

The finite element model of thin-wall taper workpiece in spining was established by software ANSYS10.0,its forming process on the base of explicit dynamics optimizer LS-DYNA,the deformation and stress feature in the forming process was analyzed,the influence factors of stress and strain on the work-piece forming quality were studied.The results show that the stress and strain nephogram indicates the respective features in the forming process,and provides the foundation for solving the problems in the forming process.The simulation can easily find the faults and reasons of break,flanging,fold and unstability etc in the spinning.The spinning stress surging and the excessive reducing rate of wall are the most important factors that result in break.By optimizing the process parameters such as reducing rate of wall,rotating speed and load,the taper work-piece forming quality can be effectively controlled.The analyzing results can provide reliable theoretical basis for the spinning die＇s design and parameters＇ choice.