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对精轧阶段存在相变的热轧钢种,因变形抗力随轧制温度的变化规律与常规的奥氏体轧制钢种显著不同,使得传统变形抗力模型的预报误差较大,严重影响这类钢种的轧制稳定性。为此,研发了一种热轧相变过程变形抗力模型,通过在原变形抗力模型基础上添加一个新的相变趋势项,该修正项为轧制温度的二次多项式函数,并根据钢种分类来精细优化适应不同钢种轧制的多项式待定参数。该模型目前已成功应用于涟钢CSP热连轧生产线变形抗力在线计算,实际生产应用表明,新模型上线后,变形抗力与轧制力的预报精度显著提高,轧制力模型预报误差12%以内的比例从83.3%提高到96.7%,满足了热连轧精轧相变带钢的稳定生产要求。
For the hot rolled steel with phase transformation in the finish rolling stage, the variation of the deformation resistance with the rolling temperature is significantly different from that of the conventional austenitic rolled steel, so the prediction error of the traditional deformation resistance model is larger, which seriously affects this Rolling stability of steel grades. For this reason, a model of deformation resistance during hot rolling transformation has been developed. By adding a new phase transformation trend term to the original deformation resistance model, the correction term is a quadratic polynomial function of the rolling temperature and is classified according to the type of steel To fine-tune to adapt to different types of steel rolling polynomial to be determined parameters. The model has been successfully applied to the on-line calculation of deformation resistance of CSP tandem rolling production line. The actual production application shows that the prediction accuracy of deformation resistance and rolling force is significantly improved after the new model is put on line, and the prediction error of rolling force model is within 12% Of the proportion increased from 83.3% to 96.7%, to meet the hot-rolled finishing transformation of the steady strip production requirements.