冷轧机工作辊非对称弯辊的板形调控理论研究与应用

为减少冷轧带钢的非对称板形缺陷的产生,设计了工作辊非对称弯辊控制系统.应用影响函数法计算辊系变形,同时考虑辊缝中金属横向流动对带钢出口横向张力分布的影响,通过迭代法计算出工作辊两端施加不同弯辊力后的辊间压力分布、出口厚度横向分布以及出口横向张应力分布.理论分析结果表明,工作辊非对称弯辊可以在一定程度上改善辊间压力分布不均,减轻轧辊磨损和减少轧辊掉皮事故的发生,降低带钢边部的非对称板形缺陷.实际应用结果证明,当倾斜调整量小于10%时,应用工作辊非对称弯辊替代倾斜调整,可以获得更好的板形精度.

Theoretical research and application of the asymmetrical bending of work rolls for shape control in a cold rolling mill

An asymmetrical bending control system of work rolls was designed to decrease the asymmetrical flatness defect of a cold-rolled strip.The influence function was adopted to calculate the deformation of the roll system and the effect of the lateral flow of metal in the roll gap on the transverse tension distribution of the strip at the exit side was taken into account.When different bending forces were exerted on both ends of work rolls,the contact pressure distribution between rolls,the lateral thickness distribution and the tension stress distribution of the strip at the exit side were calculated through the iterative method.The results of theoretical analysis show that the asymmetrical bending of work rolls can improve the pressure distribution between rolls,reduce the wear and the peeling off of rolls,and decrease the asymmetrical flatness defect of the strip at the edge.The application results prove that when the actual tilt is less than 10%,a higher accuracy of flatness is obtained with asymmetrical bending than work roll tilting.