Fast model of thermal camber evolution in metal rolling for online use

Mill engineers aiming to improve the geometry of rolled strip require knowl edge of the temperature distribution in the roll. Theoretical evidence show s that the core temperature evolves more slowly than surface temperatures a nd governs the thermal expansion of the work roll. For practical purposes t hen, a model th at predicts core temperature wi II allow online prediction and tracking of roll cambers. The present pa per builds on previous work in developing rapid models of roll core temperature. A previous model derived using Laplace transforms is improved using a matrix formulation and conver sion from an explicit to an implicit time discretisation. The implicit solu tion is more stable and allows for larger time steps than the explicit form ulation or iterative methods used previously. The model has been tested and found to make good qualitative predictions but to underestimate the camber in comparison with actual plant data and a two-dimensional finite differen ce model. I&S/1443.