Theoretical Study of the Dynamic Effects Based on Work-Roll Model in Metal Sheet Rolling Process

Abstract:

A new analytical model for the configuration of a four-high rolling mill stand is proposed in this article. Using the model, the dominant sources of stiffness in the fifth octave and the third octave models are identified. The assumptions made for the derivation of the model are that the work rolls are isotropic linear elastic, that there is no gap or separation between the work roll and the backup roll at all times. In addition, only the vertical interactions of the work roll and the roll-bite are considered. The nonlinear characteristics of this dynamic system are contributed from the contact area of the work roll and the backup roll. Analyses show that the natural frequency of the nonlinear analytical model matches the fifth octave rolling chatter, and the dominant parameters of the dynamic instability are characterized. The effects of inter-stand tensions, rolling speeds, friction between the work roll and the metal sheet roll-bite, and the thickness of the metal sheet on rolling chatter are discussed in the analysis of the dynamics of the rolling model.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 595-600
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.595
• Online since: June 2012
• Authors: Qiao Yi Wang, Yao Zhu, Rui Jin Gao, Yong Zhao
• Keywords: Chatter, Dynamic Model, Plastic Deformation, Rolling Mill

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