滚弯成形解析建模与数值分析  

Analytical Modeling and Simulation of Roll-Bending Process

作　　者：赖松柏[1] 陈同祥[1] 于登云[2] 

机构地区：[1]中国空间技术研究院,北京100094 [2]中国航天科技集团公司,北京100048

出　　处：《宇航材料工艺》2011年第5期18-22,共5页Aerospace Materials & Technology

摘　　要：建立了考虑材料塑性强化的滚弯成形力学分析解析模型,推导出了应力应变、残余应力以及回弹半径计算公式。基于非线性有限元软件,对滚弯成形进行了动态模拟,对应力应变状态、塑性应变分布、残余应力以及回弹等进行了分析计算,结果表明:板料滚弯成形初始效应明显,下压点附近曲率不均匀;采用足够的滚弯时间后,中间段的曲率均匀度很好;成形半径与上辊下压量呈近似幂函数关系;多道次滚弯可以减小两端的曲率波动和最大应力应变。最后通过与滚弯成形试验数据的对比,分析和验证了解析模型与数值模型的适用性和精度。An analytical model is developed through elastic-plastic mechanics,considering strain-hardening of material,and the formulas of stress,strain,residual stress,springback are given.Based on nonlinear FEM package,the dynamic simulation of roll-bending is also carried out.Then stress state,plastic strain distribution,residual stress and springback are analyzed,together with effect of displacement of toproller and multi-pass.The result shows that curvature near the start point is not uniform,but curvature of the middle section of the plate is very uniform if the rolling time is long enough;the radius of bended plate is a power function of displacement of toproller;multi-pass can reduce the fluctuation of curvature,the maximum stress and strain of the plate in bending.Finally,the analytical model and FE model are verified by experiments.

关 键 词：滚弯成形 弹塑性 塑性强化 数值仿真 非线性有限元 回弹 

分 类 号：TG386.43[金属学及工艺—金属压力加工]