残余氧化铁皮对机座刚度及轧制力偏差分析

Analysis on the effect of residual oxide scale on the base frame stiffness and rolling force deviation

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。

According to the real condition of the rolling force deviation of heavy plate mill in a strip factory,the effect of the stiffness differences at the both sides of the rolling mill on the rolling force deviation was researched.The stand overall stiffness model was established when there was residual oxide scale on the stepped mats during adjusting backup roll standard height,Then based on model alternate method,the rolling mill FEM model was established.Furthermore,the changing deflection of roll,exit thickness variation,pressure between rolls variation and the rolling force deviation at the both sides of the rolling mill was calculated through the FEM simulation.The results showed that when the thickness of the oxide scale was 5mm and the residual area was 26.66%,36.79% and46.92%,respectively,oxide scale equivalent stiffness was varying from 605kN/mm to 674kN/mm.And when there was no stiffness difference between the up and down of the rolling mill,the rolling force deviation at the both sides of the mill rolling reached the minimum value of 5tons.Moreover,when the largest oxide scale area was attained,the rolling force deviation at the both sides of the rolling mill achieved the maximum value of 30 tons.