New approach to calculating a dynamically stable criterion for hot strip mills

Abstract

A new approach to calculating the dynamical behaviour of hot strip mills is developed within the linear response region. This method is based on a numerical calculation model using FEM for steady-state velocity distribution of metal flow between rolls. By applying the perturbation of roll displacements and velocity to two-dimensional systems, damping and stiffness matrices are obtained by numerical calculation under certain reasonable boundary conditions. The dynamically stable criterion obtained from these matrices is in good agreement with experimental results. In addition, it is made clear that the friction and distortion of the strip flow pattern play an important role in the onset of autonomous vibration.

Keywords

hot strip mills autonomous vibration perturbation FEM

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