热轧带钢精轧过程考虑相变的轧制力模型

对部分在精轧过程发生相变的热轧钢种，当在双相区轧制时，因奥氏体与铁素体的变形抗力随轧制温度的变化规律不同，使得传统轧制力模型的预报误差很大，影响轧制过程参数控制精度.为此，研发了一种适用于精轧过程发生相变的热轧轧制力模型.首先建立了余弦形式的相变体积分数模型，算出不同轧制温度下奥氏体与铁素体的体积分数；接着，建立加权形式的轧制温度对变形抗力影响项的计算公式，较好地模拟出轧件在双相区轧制的变形特性；最后，把该模型用于宝钢1880热轧轧制力预报在线计算，实际生产表明，该模型显著提高了无取向电工钢等精轧相变带钢的轧制力预报精度，改善了轧制稳定性.

Rolling Force Model Considering Phase Transformation for Hot Strips During Finishing Process

When phase transformation occurs during the finishing process for hot strips， the change regulations of the rolling temperature on the deformation resistance in the austenitic and ferrite are different， so the prediction error of traditional rolling force model is very significant， which impacts the control accuracy of rolling process parameters. To solve the problem， a rolling force model was developed considering phase transformation for finishing strips. First， a transformation volume fraction model in the form of cosine was established and the volume fractions of the ferrite and austenitic were calculated at the different rolling temperatures. Secondly， an effect formula of the rolling temperatures in weighting form on the deformation resistance was presented， which preferably simulated the deformation characteristics of the double phase rolling. Finally， the proposed model was applied to the online calculation of Baosteel 1880mm HSM， the actual production showed that the proposed model significantly improved the rolling force prediction accuracy and rolling stability of the phase transformation strips such as non oriented electrical steels in the finishing process.