【摘要】 采用动力显式弹塑性有限元方法对U型钢辊弯成形过程进行仿真,分析了成形过程中应力、应变的分布演化特性,获得了弯曲角增量、机架间距对辊弯成形过程的影响规律,计算结果与实验结果有较好的一致性。基于数值模拟,对辊弯成型轧辊辊径进行优化设计。通过正交模拟实验获取计算结果样本,进而建立轧辊辊径设计目标函数的响应面模型,最终获得辊径优化设计结果,优化后辊弯成形板带截面上的纵向应变差显著降低,改善了成形性能。更多还原

【Abstract】 Considering the long forming distance of roll forming,the roll forming of a “U” channel part was simulated with the dynamic explicit finite element method.The distribution of stress and strain was obtained and the influence of bending angle increment and stand distance on the forming process was studied.The calculated result shows good agreement with the experimental one.Furthermore,the roll diameters were optimized with a simulation-based optimization method.Through design of simulation experiments,large amounts of calculation results were obtained.Then a response surface model for roll diameter design objective function was established,through which the optimized roll diameters could be easily obtained.The contrast between the optimized scheme and initial one shows the validity of the simulation-based optimization method.The difference of longitudinal strain in the formed section is notably decreased through optimization and the forming performance of the sheet metal is improved.更多还原