大型轧钢机机架凝固过程温度场应力场模拟分析

Numerical Simulation of the Solidification Process of a Heavy Roll Stand for Temperature Field and Thermal Stress Field

采用FDM/FEM集成分析系统,对152 t轧钢机机架凝固过程中的温度场和应力场进行了模拟计算;根据温度场计算显示了机架凝固过程中补缩通道变化情况。机架应力场模拟包括铸件凝固、冷却及落砂后冷却整个过程。以凝固过程中准固相区的等效应力与强度的比值分布规律为依据,对该铸件的热裂倾向性进行了预测,给出了危险区的位置。还给出了机架的残余应力和变形。模拟结果与实际生产情况较为吻合。

The solidification process of a roll stand weighting 152 tons was simulated by the FDM/FEM integration system, including temperature field and thermal stresses field. The evolution of feeding channel was presented based the analysis of temperature field results. The variation of thermal stresses covers the process of solidification, subsequent cooling including shakeout of the heavy casting. The tendency of occurrence of hot tearing was predicted and the positions with high tendency were marked by the criteria based on both the ratio of Von Mises stress over yielding stress and the semi-solid region. The residual stress and deformation of the casting was discussed as well. The simulated results are in agreement with the practice approximately.