关键词: 模型, 三倍频颤振, 相平面, 再生颤振, 轧机

Abstract: 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.

Key words: Model, Phase-plane, Regenerative chatter, Rolling mill, Third-octave-mode chatter