基于LSDYNA对U型梁辊弯成形的仿真与分析

Simulation and analysis on U-shaped beam roll bending based on LSDYNA

为解决高强度、大厚度板材辊弯成形尺寸难以控制的问题,针对高强钢厚板U型梁辊弯成形,建立了仿真模型并利用非线性有限元软件进行了成形过程仿真。通过引入辗轧道次,将改变弯角部分的应力分布,将其与仅单纯过弯道次时的应力分布进行对比。通过不同辗轧距离的仿真结果发现:当进行辗轧后弯角部分的应力较仅有过弯道次时的应力更小且分布更加离散,改善了截面缩口问题;分析了辊站间距对边波缺陷的影响,辊站间距越大,边波缺陷越严重。最后通过实验,将测量的实际加工零件尺寸参数和仿真参数进行对比,较目标值的误差在1%以内,符合设计生产要求。

To solve the problem of difficult control of roll bending dimension for high-strength and large-thickness plates,for the roll bending of high-strength steel thick plate U-shaped beam,a simulation model was established,and the forming process was simulated by nonlinear finite element software.Then,the stress distribution in the corner part was changed by introducing the rolling passes which was compared with the stress distribution of only simple bending pass.The simulation results of different rolling distances show that the stress in the corner part after rolling is smaller and more dispersed than that of only bending pass,which improves the cross-sectional shrinkage problem.By adjusting the spacing between roll stations,the influence on the edge wave defects was summarized.The larger the spacing between roll stations,the more serious the edge wave defects.Finally,through experiments,the measured dimensional parameters of actual processed parts and the simulation parameters were compared.The error compared with the target value is within 1%,which meets the design and production requirements.