二十辊轧机非对称轧制过程中热辊型预测技术

Prediction technology of hot roll shape during asymmetrical rolling in 20-high rolling mill

针对某钢厂二十辊轧机上下辊系润滑条件非对称带来的上下工作辊辊型预测困难,进而导致辊缝设定误差问题,从二十辊轧机的设备和工艺特征入手,分析了上下辊系的润滑条件差异。首先,考虑轧制过程中摩擦热和变形热的产生、轧辊的热传导和对流换热,同时考虑二十辊轧机上下辊系非对称带来的边界条件差异,建立二十辊轧机上下辊系工作辊温度场计算模型。最后,在温度场计算的基础上建立二十辊轧机上下辊系工作辊热辊型计算模型,形成一套相应的二十辊轧机非对称轧制过程中热辊型预测技术,将该技术应用到现场生产实际,以现场典型规格产品作为实验对象,将模型计算结果与轧后实际热辊型进行对比,结果表明,误差在5%以内,证明该热辊型预测技术具有较高的精度,能够准确预测二十辊轧机非对称轧制过程中热辊型。

Aiming at the difficulty of predicting the upper and lower work roll shapes caused by the asymmetry of the lubrication conditions of the upper and lower roll systems of a 20-high rolling mill in a steel mill,which leads to the error problem of roll joint setting,starting from the equipment and process characteristics of the 20-high rolling mill,the difference of the lubrication conditions of the upper and lower roll systems was analyzed.Firstly,considering the generation of friction heat and deformation heat,heat conduction and heat convection of rolls during rolling process,and considering the difference of boundary conditions caused by the asymmetry of the upper and lower roll systems of the 20-high rolling mill,the calculation model of temperature field of the upper and lower roll systems of the 20-high rolling mill was established.Finally,on the basis of temperature field calculation,the calculation model of hot roll shape of the upper and lower roll systems of the 20-high rolling mill was established to form a set of corresponding hot roll shape prediction technology in the asymmetric rolling process of the 20-high rolling mill.The technology was applied to the actual on-site production,and the typical specifications of the field products were taken as the experimental subject,and the calculation results of the model were compared with the actual hot roll shape after rolling.The results show that the error of the result is less than 5%,which proves that the hot roll shape prediction technology has high accuracy and can accurately predict the hot roll shape in the asymmetric rolling process of the 20-high rolling mill.