热轧带钢传热模拟及变形区换热系数的确定

Simulation of Thermal Evolution of Strip and Determination of Heat Transfer Coefficient in Deformation Zone During Hot Rolling

采用数值模拟方法研究了带钢热轧区轧件传热和温度场分布规律。结合现场生产中测温数据,建立了轧制变形区内轧件与轧辊接触传热界面换热系数(HTC)统计模型。分析了辊缝变形区中轧件断面上温度演变和分布特点。研究结果表明,热轧带钢热轧区传热数值模拟计算结果与实际吻合良好;变形区内轧件与轧辊接触传热界面换热系数不仅与平均单位压力相关,而且与轧制速度相关;轧件在轧制变形区存在很大的温度梯度。

The numerical simulation method was used to study the heat transfer and temperature distribution of roll- ing piece during hot strip rolling. According to the temperature measured in production, a statistical model of interface HTC for prediction of thermal evolution of rolling piece in roll gap was developed; and some features of the thermal evolution and temperature distribution on the cross section of rolling piece in roll gap are analyzed, The results show that there is a good agreement between the values predicted by the model and measured ones; the interface HTC between rolling piece and work roll is dependent on the mean rolling pressure as well as the rolling speed; and there is a significant temperature gradient on the cross section of rolling piece in roll gap.