锻压技术

重轨BD2异形孔型可逆轧制过程的有限元模拟分析

英文标题：FEM simulation and analysis on reversible rolling process of asymmetric groove BD2 for heavy rail steel

分类号：

出版年,卷(期):页码：2015,40(10):142-148

摘要：

通过翻转和平移轧辊的方法来实现轧件翻钢和侧向推钢过程，并通过给轧件加载一个加速度来实现可逆轧制，在此基础上对60 kg·m-1的U71Mn钢重轨轧制BD2异形孔可逆轧制过程进行了三维热力耦合有限元模拟，分析了轧件在各道次轧件横断面等效应变分布、温度场变化以及轧制力数据。结果表明：轧件的中心存在一个较大的低变形区域，并且随着轧制进行被分隔成两个部分，最终在轨头以及轨底的中心位置形成两个低变形区域，这种变形规律不利于铸坯心部缺陷的修复，轧件内部最高温度出现在轧件心部到表面的中间位置。温度和及轧制力的实测值与模拟值吻合良好，验证了模型的有效性。

The steel tilting and lateral pushing process were achieved by turning over and moving the rollers respectively, and the reversible rolling was achieved by loading an acceleration to the workpiece. A coupled thermo-mechanical simulation was carried out on the reversible rolling process of asymmetric groove BD2 for heavy rail steel 60 kg·m-1, and the distribution of equivalent strain and temperature change and rolling force on the cross-sectional of the workpiece in each step were analyzed. The results show that there is a large area with low deformation at the center of rolled pieces, which is separated into two parts with the rolling process, and finally two lower deformation area at the center of the head and rail bottom are formed respectively. Above deformation regularities are harmful to repair the defect of billet core. Furtherly, the highest temperature appears in the middle between the center and the surface. The measured values of temperature and rolling force are in good agreement, and the effectiveness of this model is verified.

基金项目：

谭海林（1968-），男，硕士，副教授

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