板材多道次热轧的有限元连续模拟

Plate shape research by continuous FEM simulation of multi-pass plate hot rolling

为充分考虑各因素对板形的影响,建立了三维弹性等效空心辊模型,开发了有限元数据的参数化生成模块;自主编制了网格重划分及参数传递模块,并与有限元软件MARC相结合,显著节约了建模及计算时间,使多道次连续模拟成为可能;成功解决了计算过程中网格畸变带来的计算困难并实现了前后道次之间参数的连续性,最终实现了中厚板多道次热轧过程的连续模拟;模拟成功施加了弯辊力、轧辊初始凸度及热膨胀系数,充分考虑到对板形产生影响的各因素,以实际轧制规程为参考,进行了七道次热轧过程的连续模拟;轧制力、温度以及轧件的变形特征与实际吻合较好,验证了模拟方法的正确性.

To fully consider the infect of all the factors on plate shape,a 3-D elastic ＇hollow-roll＇ model and the parametric generation module of FEM model is establelished,which makes it possible to simulate a multi-pass rolling process continuously.An input data generating system is also set up which involves a mesh refinement module and parameter transfer module.Through this system,the calculation results from the former pass can be directly transferred to the next pass input file as initial conditions and the refined mesh can be directly added into the input file too.This enables the simulation for multi-pass rolling going continuously.The model considers the factors influencing plate profile,such as roll-bending force,initial crown,thermal crown and heat transfer during rolling and inter-pass cooling.A seven-pass industrial hot rolling process was continuously simulated and the results show that the rolling force,temperature and plate profile agree well with the measured ones respectively.