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The tandem cold mill chatter in sheet rolling has not always same phenomena even if under constant operating condition. For example, rolling speed and diverse frequency are not constant when chatter begins to occur. The reason why conditions of chatter are changeable is that the tension between mill-stands and the friction coefficient at the roll-bites are easy to be changed. In order to study the influence of tension and friction on rolling speed, two stands tandem systems based on two degrees of freedom vibration model are investigated. The following findings were obtained : (1) As the rolling speed increases, rolling mill vibrations become less stable. (2) The allowable range of the friction coefficient and tension condition to ensure the stability becomes narrow under high-speed rolling. (3) The fluctuation of tension and friction coefficient have a lot of influence on the natural frequency of chatter under high-speed rolling.

Vibration Analysis of Chatter in Cold Rolling Mill (Theoretical Study on Self-Excited Vibration by a Two-DOF Tandem Model)