卷取机芯轴张力对热轧带钢卷取温度控制的影响分析

Analysis of the influence of coiler mandrel tension on coiling temperature control of hot rolled strip

热轧带钢卷取温度控制过程中,带钢速度是最重要的影响因素之一。当带钢尾部离开精轧末机架后,带钢速度由轧辊线速度转化为卷取机芯轴速度,复杂的卷取过程影响了带钢速度的稳定,导致带钢尾部卷取温度控制出现严重偏差。为了解决该问题,将温度模型、张力扭矩模型以及热轧生产大数据进行有机结合并进行了系统性分析。结果表明:卷取机芯轴张力控制异常是造成带钢卷取温度偏差的主要原因。因此,开发了卷取机芯轴张力报警功能,细化了芯轴张力与夹送辊压力控制的带钢厚度层别,优化了控制参数以保证带钢速度稳定,同时开发了带钢尾部卷取温度补偿模型。结合多目标优化,取得了较好的应用效果,带钢尾部温度超差占比下降3.26%,卷取温度命中率提升2.29%,为全面解决带钢通长方向卷取温度命中率提供了新的技术方案。

In the coiling temperature control of hot rolled strip,strip speed is one of the most important factors.When the strip tail leaves the finishing mill,the strip speed is controlled by coiler instead of finishing mill,and the complex coiling process influence the stability of the strip speed,resulting in serious control deviation of the coiling temperature at the strip tail.In order to solve the problem,the temperature model,the tension torque model and the big data of production were organically combined and systematically analyzed.The results show that the abnormal mandrel tension control of coiler is the main reason for the temperature deviation of strip coiling.Therefore,the mandrel tension alarm function was developed,the strip thickness layer controlled by the mandrel tension and the pressure of the pinch roll were refined,and the control parameters were optimized to ensure the stable speed of the strip.Meanwhile,the coiling temperature compensation model of the strip tail was developed,which combined with multi-objective optimization and achieved good application results.The proportion of temperature over difference of the strip tail was reduced by 3.26%and the coiling temperature hitting rate was increased by 2.29%,which provided a new technical solution for comprehensively solving the coiling temperature hit rate of strip through length.