Abstract
In this paper, we find the violent vibration of the hot rolling mill is induced by the combination of the screw-down system and the strip, explain how the srew-down-strip combined excitation effects the rolling mill, and introduce an effective method to restrain the vibration. First, two experiments, stripless rolling and turning off the screw-down system, are conducted, the first experiment simulates the rolling process without strip and the second experiment simulates the rolling process without the screw-down system, the results indicate that the rolling mill vibration is induced by the srew-down-strip combined excitation. Then, to explain this phenomenon, the mathematical model of the rolling mill under screw-down-strip combined excitation is proposed, we find that few excitation frequency components can induce more response frequency components, therefore it’s more possible to approach the natural frequency of the rolling mill. Finally, a vibration suppression method is introduced by eliminating some specified frequency components of the screw-down system with a filter, and the result shows that the vibration decreased by 98.7 %.
Highlights
It is well known that mill vibration has become a bottleneck in thin steel strip manufacturing and a global problem [1]
Rolling mill vibration research aims to analyze dynamic characteristics and obtain vibration suppression method based on mathematical modeling and data-driven methods
As for the drive system, Zhang et al [2] found the combination of the harmonics of electromagnetic torque and the rolling force induced the hot strip rolling mill vibration
Summary
It is well known that mill vibration has become a bottleneck in thin steel strip manufacturing and a global problem [1]. Shi et al [6] established a dynamic model of multi-degree-of-freedom main drive system, by analyzing the model, found that the torque disturbance was one of the main factors resulted the vibration. As for the strip and other factors at the roll gap, Gao et al [10] considered the equivalent elastic-plastic stiffness, established a dynamic model of structure-process coupling model of the rolling mill, and obtained the instability condition of the system and the velocity threshold of self-excited vibration. Liu et al [11] considered the influence of roll vibration on the rolling force, established a nonlinear seven degrees of freedom vibration model of a four-roll cold mill and obtained the amplitude-frequency characteristic.
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