基于负荷均衡的高速线材轧机孔型优化设计

采用大型非线性有限元软件MSC.Marc,通过三维热力耦合弹塑性有限元方法对高速线材中轧区五机架热连轧过程进行了模拟,以各轧机相对等负荷为目标函数,运用Visual FORTRAN语言对MSC.Marc进行二次开发,准确计算了现场及孔型优化后的各道次轧制力和轧制力矩,相对负荷由现场的3.46%～133.91%减小到2.62%～19.3%,使生产工艺更加合理,对实际生产具有重要的指导意义.     

热连轧过程中力能参数的三维仿真分析

借助大型商品有限元软件MSC.MARC及其先进的接触求解方法,采用真实工艺尺寸,以热力耦合大变形理论为基础,真实地模拟出了高速线材预精轧区六机架热连轧过程,计算并分析了轧制过程中的应力场、轧制力与轧制力矩等力能参数随时间增量步的变化规律,计算结果对现场轧制工艺参数的调整优化有重要的参考价值,对实际生产也有重要的指导意义.     

Formation mechanism in alloy steel rolling process using thermo-mechanical coupling method

Based on the theory of elastic-plastic finite element method, the high-speed hot continuous rolling process of a billet is simulated and analyzed in vertical and horizontal passes. The billet is dragged into the passes by contact friction force between the billet and rollers. The rollers and billet are represented by respectively rigid and deformable bodies, and three-dimensional models are developed for the billet and rollers. The distribution of deformation field, effective strain, rolling force and temperature field are accurately calculated for the whole rolling process (including unstable and stable stages). In addition, the rolling pressure on the width symmetry center is compared with that in the in-situ experimental measurements. It is revealed that various heat exchange phenomena among the billet, rollers and surroundings can result in unbalanced temperature distribution on the cross section. Rolling force and strain can change significantly when the billet is moved towards or away from the roller gap, and keep almost invariable in the stable stage. It is expected that the simulation results would be useful for practical manufacture and provide the theoretical foundation for improvement of process planning and optimization of process parameters.     

基于数值模拟的线材轧制成形过程研究

通过对线材热连轧过程传热关系进行分析,利用热力耦合弹塑性有限元方法建立了线材与轧辊的三维数值计算模型,结合热轧生产线的实际情况,对高速线材轧制生产线预精轧区六道次轧制过程中的温度场、轧制力与轧制力矩进行了模拟计算。分析了变形区内温度场的分布和变化规律,探讨了轧制过程中所涉及的几何、材料和边界条件等多重强非线性问题,计算结果为生产工艺制度的改进、工艺参数的优化以及微观组织变化规律的研究提供了理论依据,对现场生产也有重要的参考价值。