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针对国内某厂厚板轧机出现轧制力偏差的实际情况,研究了轧机两侧刚度差对轧制力偏差的影响。建立了支撑辊标高调整时候阶梯垫上面残留氧化铁皮对轧机机座刚度的影响模型,基于模型替代法建立了整体轧机有限元模型,进而通过有限元模拟计算出轧机机座刚度差引起的轧辊挠度改变量、出口厚度变化量、辊间压力变化量以及轧机两侧轧制力的偏差。结果表明:当氧化铁皮的厚度为5mm残余面积分别为26.66%、36.79%和46.92%时,氧化铁皮的等效刚度变化范围为[605,674]kN/mm。当轧机上下无刚度差时,轧机两侧轧制力偏差最小,偏差为5t;当压入的残余氧化铁皮面积最多时,此时轧机两侧轧制力偏差最大,数值为30t。
Aiming at the actual situation of the deviation of rolling force of a domestic mill, the influence of the difference of rigidity on the rolling force between two sides of the rolling mill was studied. The influence model of residual oxide scale on the rigidity of rolling mill stand was established when the supporting roller height was adjusted. Based on the model substitution method, the finite element model of the rolling mill was established. Then the deflection of the rolling mill caused by the stiffness difference of the rolling mill was calculated by finite element method The amount of change, the amount of change in exit thickness, the amount of pressure change between rolls, and the roll force on both sides of the mill. The results show that the equivalent stiffness of scale is [605, 674] kN / mm when the scale area of oxide scale is 26.66%, 36.79% and 46.92%, respectively. When the rolling mill has no stiffness difference, the deviation of the rolling force on both sides of the rolling mill is the smallest with a deviation of 5t. When the area of the residual oxidized iron skin is the largest, the rolling force on both sides of the rolling mill deviates most from the value of 30t.