Abstract
An effective dynamic model is the basis for studying rolling mill vibration. Through analyzing characteristics of different types of vibration, a coupling vibration structure model is established, in which vertical vibration, horizontal vibration, and torsional vibration can be well indicated. In addition, based on the Bland-Ford-Hill rolling force model, a dynamic rolling process model is formulated. On this basis, the rolling mill vertical-torsional-horizontal coupled dynamic model is constructed by coupling the rolling process model and the mill structure model. According to this mathematical model, the critical rolling speed is determined and the accuracy of calculated results is verified by experimental data. Then, the interactions between different subsystems are demonstrated by dynamic responses in both time and frequency domains. Finally, the influences of process parameters and structure parameters on system stability are analyzed. And a series of experiments are conducted to verify the correctness of these analysis conclusions. The results show that the vertical-torsional-horizontal coupled model can reasonably characterize the coupling relationship between the mill structure and the rolling process. These studies are helpful for formulating a reasonable technological procedure of the rolling process and determining a feasible dynamic modification strategy of the structure as well.
Highlights
Strips are the most widely used rolled products
As the model of rolling mill vibration is formulated by coupling the dynamic rolling process model with the mill structure model, it is necessary to verify the effectiveness of the rolling process model by test data
For the wide existence of vibration in cold rolling mill, this paper has conducted a systematic study on multiplemodal-coupling modeling and stability analysis of rolling mill vibration
Summary
Strips are the most widely used rolled products. With the increase of steel productions and the further optimization of the steel product mix, the industrial demand for strips has been growing, and the requirement for the product quality has become increasingly strict. Tamiya et al [2] studied the third-octave-mode chatter on a cold rolling mill and reported that this type of vibration is a self-excited vibration due to the phase difference between the vertical movement of rolls and the strip tension at entry. On this basis, Yun et al [3], Hu et al [4], and Zhao and Ehmann [5], the scholars of Northwestern University, conducted a series of systematic studies on vibration of rolling mills. According to this mathematic model, the critical rolling speed of the system is calculated, the interaction between the different subsystems is discussed, and the influence of process parameters and structure parameters on the system stability is analyzed
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