冷带轧机生产中时常会发生振动,发生最频繁的是一种扭转振动和两种垂直振动,使带材表面出现条纹,产生大量废品,甚至造成断带、停工以及使设备损坏,尤其在高速冷连轧机生产中的垂振直接妨碍了冷带轧制速度的提高。 作者对冷带轧机低频扭振和频率分布在150～250Hz的垂直振动进行了深入研究,对其为自激振动的本质进行了理论分析。证明在混合润滑阶段的一定区域内,摩擦系数随轧机速度增加而降低造成的负阻尼作用是引起轧机自激扭振的主要原因,建立了轧机自激扭振基本模型,并探讨了不同工作情况下, Cold rolling mills often produce vibrations in the production, most frequently a torsional vibration and two vertical vibrations that strip the surface of the strip, produce large amounts of scrap, and even cause broken tapes, shutdowns, and equipment damage, especially at high speeds Vertical vibration in cold tandem mill directly hinders the increase of cold rolling speed. The authors studied the low frequency torsional vibration and frequency distribution of cold rolling mill vertically vibrating at 150 ~ 250Hz and conducted theoretical analysis on the nature of self - excited vibration. It is proved that the negative damping caused by the friction coefficient decreasing with the increase of the rolling mill speed is the main reason that causes the self-excited torsional vibration of the rolling mill in a certain region of the mixing lubrication stage. The basic model of the self-excited rolling mill is established and the different working conditions under,