Numerical Investigation of Chatter in Cold Rolling Mills

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In this work, considering a four high cold rolling mill and using a dynamic friction model, expressions for the variation of pressure in the roll bite have been developed. The effects of parameters used in the dynamic friction model on the variation of pressure and shear stress are investigated. The numerically obtained horizontal and vertical work roll deflections using the dynamic friction model have been compared with those obtained by the conventionally used constant friction model. The effects of rolling parameters like strip thickness; periodic back tension and strip velocity on the work roll deflections have been studied. This work will find applications in predicting the critical system parameters in cold rolling to avoid chatter.