Coupling vibration characteristics and vibration suppression of rolling mill rolls with dynamic vibration absorber

The various forms of coupled and nonlinear vibrations generated by the rolling mill during the plate or strip rolling process restrict the high-speed, efficient, and continuous rolling production, which is an urgent problem to be solved in the field of plate or strip rolling. This paper designs a spring-damping dynamic vibration absorber for suppressing rolling mill vibration based on the work roll structure and working characteristics of the rolling mill. A four-degree-of-freedom horizontal and vertical coupled vibration model with piecewise function form is established through considering the gap between the bearing seat of work roller and mill housing. The parameters of the absorber are optimized by using adaptive genetic algorithm, and the effect of the absorber on system vibration under the optimal parameters is analyzed. The amplitude frequency characteristic equations of the primary resonance and internal resonance of the system are obtained by using the average method and multi-scale method respectively. The influence of the parameters of the dynamic vibration absorber on vibration is analyzed. A horizontal and vertical vibration control experiment is conducted on the work roll of the rolling mill. The results show that the dynamic vibration absorber can effectively suppress the horizontal and vertical vibration of the roll, and the difference in amplitude reduction between experimental and theoretical analysis is within 5 %, which verifies the effectiveness of the designed dynamic vibration absorber. These results provide some guidance for the research on vibration suppression of rolling mills.