圆钢轧制过程中弯曲低头模型

研究了极限规格的圆钢在轧制过程中的低头现象,防止其在飞剪前堆钢.通过研究小圆钢温度、轧制力和电机功率模型,分析了小圆钢在飞剪处由于直径变小,内应力的降低,容易形成低头,使向前运动的小圆钢头部低于挡板造成堆钢的过程.求解出了挠度变化方程,建立了飞剪处小圆钢低头模型.现场实验中对理论研究计算出的多种极小规格圆钢进行了轧制实验,在有飞剪和无飞剪情况下小圆钢低头实验结果与模型和仿真结果一致.

Model of Head Sag of Round Bars in Rolling Process

The head sag of a minimum-size round bar in rolling process was investigated to prevent it from crooking and heaping in front of a flying shear.The temperature of bar,rolling force and power of mill drive motor were thus modeled to analyze the causes of bar crooking/heaping,such as the decreasing internal stress due to reduced bar size enables the head of running bar to be lower than the baffle of flying shear,crook and heap.Solving the function of deflection of round bar,a mathematic model was developed for its head sag.Some in-situ rolling experiments were conducted for various small-size round bars to check how the theoretically calculated results conform to the actuality.They showed that the calculated results in accordance to the head sag model are in conformity to experimental results in case there is or no flying shear.