A Qualitative Study of the Contact Pressure Distribution in Cold Rolling

Cold rolling forces are strongly affected by lubrication and material properties, and may potentially be used to estimate material property variations along the coil. The 1D slab method is commonly used to estimate rolling forces as it is computationally inexpensive. By model definition,the pressure distribution as modelled in the slab method has a single peak or friction hill in the rollbite. However, it has been observed in several studies that multiple local peaks can appear in the pressure distribution in the roll bite. Additionally, material anisotropy also affects the contact pressure distribution and steady state roll force. In the present work, a 2D plane strain finite element rolling model is used for a detailed sensitivity study of the multitude of parameters that affect the vertical pressure distribution and the steady state roll force. The considered model parameters are material anisotropy, entry sheet thickness, roll radius, tensions, coefficient of friction and roll gap.