Research on Dynamic Characteristics Based on Roll-Bite Model in Metal Elastic-Plastic Deformation Process

The main issue in cold rolling is the control of rolling chatter, the deformation of the metal sheet roll-bite is ideally homogeneous and elastic-plastic. In addition, only the vertical interactions of the work roll and the roll-bite are considered. The sheet force resulted from the elastic-plastic deformation of the roll-bite is established to be the dominant factor affecting the dynamic response of the work roll. Although the developed rolling system is highly nonlinear, however, the induced instability and chatter in response to various types of sheet force excitations are either modal excitation or resonance-like beating, both of which are characteristically linear. This article establishes the fundamental knowledge base required for the understanding of the characteristics and mechanism of the third and the fifth octave rolling chatters, and thus provides the essential basis for effective control of rolling instability and chatter-free roll mill design.