四辊冷带轧机三倍频颤振机理的研究

研究了四辊冷带轧机三倍频颤振的产生机理,发展了轧件振动模型,分析了由于轧件失稳所导致的轧机颤振现象,提出了轧机三倍频再生颤振模型,并对其进行了理论研究,仿真结果和现场测试进一步论证了三倍频再生颤振理论模型的正确性及其工业价值。

STUDY ON THIRD-OCTAVE-MODE CHATTER ON 4-H COLD ROLLING MILLS

Chatter in the rolling stack of high velocity tandem mills and temper mills is a widespread problem as it affects the quality of the finished product and the productivity of the rolling mill. In order to control chatter in cold rolling operations, a much deeper understanding of the basic mechanics of the problem is required. Therefore, a rolled strip chatter model for comprehending instability of the strip due to the change of the friction force and a third-octave-mode regenerative chatter model due to time delay effect of the chatter marks between the immediate stands are proposed, and stability analysis of chatter models due to negative damping is given. Subsequently, for more detailed understanding of the third-octave-mode regenerative chatter phenomena, industrial investigations proceed in practice and a simulator is developed. The simulation results indicate that regenerative chatter is much more serious than simple chatter.