Abstract: Mill vibration has been an important issue restricting the development of strip rolling. An effective mill system dynamics model is the basis for studying the mill vibration. But the existing research still has many deficiencies in coupled modeling of the rolling mill. By the analysis of the generating mechanism of different types of vibration and their internal relationship, a coupling vibration structure model is established, in which the vertical vibration, horizontal vibration, torsional vibration and the chatter of rolled piece can be well indicated. In addition, based on the Bland-Ford-Hill rolling force model and considered the dynamic changes of roll gap spacing in the state of vibration, a dynamic rolling process model is formulated. On this basis, taking the dynamic variations of rolling force and rolling torque as the feedback excitation to construct the new overall coupled dynamic model, which can reflect the coupling relationship between the rolling process model and the coupling vibration structure model. The correctness and validity of the overall coupled dynamic model are verified by using the vibration test data of 2030 cold rolling mill. The results show that overall coupled dynamic model can reasonably characterize the coupling relationship between the mill structure and the rolling process. It may be helpful for further study on the coupled vibration characteristics of the rolling mill.

Key words: coupled vibrations, overall coupled modeling, roll gap spacing, rolling dynamics, rolling mill