U71Mn重轨BD1可逆轧制过程的有限元分析

Finite Element Analysis of BD1 Reversible Rolling Process for U71Mn Heavy Rail Steel

利用ANSYS/LS-DYNA非线性有限元软件对60 kg/m U71Mn重轨生产从铸坯出炉—高压水除鳞—BD1开坯直至BD2入口整个过程进行数值模拟。采用平/立交替代替道次翻钢的方式,保证了BD1可逆轧机数据的精确传递。分析了轧件在各道次变形区及轧后稳定断面处等效应力、等效应变的分布情况,得到了U71Mn重轨钢表面温降曲线及轧制压力曲线。结果表明:轧件表层与心部的应力、应变分布存在差异;稳定截面处第5道次侧面应力最大72.1MPa,且断面应变比较均匀;温度和轧制力计算结果与实测值吻合良好。

The whole process （the casting blank released from furnace-high pressure water descaling- BD 1 blooming until BD2 entry） produced 60 kg/m U71Mn heavy rail was simulated by using nonlinear finite element software ANSYS/LS-DYNA. The precise transfer of BD1 reversible mill data was ensured by adopting fiat/vertical interchange instead of pass reversal steel. The distribution of equivalent stress and strain of the rolled piece at the deformation zone and the stable sectional area was analyzed. The temperature curves of the surface points of U71Mn heavy rail steel and the rolling pressure curves were obtained. The results show that stress and strain distribution between workpiece surface layer and center are different; the stress at the stable cross-section of the fifth pass is the maximum of 72.1 MPa, and the strain at the section is uniform; temperature and the rolling force results are in good agreement with the measured values.