摘要
回弹是由工件在卸载后的弹性变形引起的。板料成形过程中为了控制成形件的最终形状,必须进行回弹设计优化。准确预测回弹对于板料成形过程的模具设计非常重要。降低回弹模拟结果与试验结果的偏差是设计过程中的难题。基于NUMISHEET’02的自由弯曲标准考题考虑板材与模具间的接触演变过程,建立了一个有限元模型来预测回弹。采用一个常规的优化方法对有限元分析中的材料和单元模型进行了分析,研究发现不同模型对回弹结果有较大影响。模拟结果与参考文献中的试验结果比较表明了模型的正确性和可行性。
Springback in sheet metal forming process is due to the elastic deformation of the part during unloading. The design optimization of springback in sheet metal forming process is to control the final shape of the workpiece. Accurate prediction of springback is essential for the design of tools used in sheet metal forming operations, The manufacturing process design difficulty is formulated to minimize the difference between the shape of the desired workpiece geometry and the final analysis result after elastic springback. A finite element model is used to predict springback with contact evolution between the sheet and dies, A relatively simple springback benchmark （unconstrained bending of NUMISHEET＇02） is solved, Sensitivity analysis done using FEM demonstrated that the magnitude of springback and the overall accuracy are highly influenced by the integration points, element size and material model. A conventional optimization method combined with FEM is used to obtain optimum parameters that can predict springback more accurately than 90%. The solutions are validated with experimental data in the literature.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2005年第11期189-193,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50475125)江苏省自然科学基金(BK2002009)资助项目。
关键词
回弹
自由弯曲
有限元法
建模
优化
Springback Unconstrained bending FEM Modeling Optimization
