Advanced roll bite models for cold and temper rolling processes


  • T. Dbouk
  • P. Montmitonnet
  • N. Suzuki
  • Y. Takahama
  • N. Legrand
  • T. Ngo
  • H. Matsumoto


This paper describes on-going efforts made to develop a fast and robust roll bite model for cold and temper rolling
processes including a non-circular roll profile and a mixed lubrication model based on lubricant flow and surface
asperity deformation models (only Coulomb friction is used in this paper however). First, the existing roll bite
models are reviewed in details to understand their physics, their specificities, their differences and their resolution
strategies, with a particular focus on strategies allowing for short computing time (CPU) even for heavily deformed
non circular roll profiles. From this preliminary analysis, some existing strategies are selected to develop a new
roll bite model. It includes in particular calculation of roll surface circumferential displacements for roll profile
determination and an efficient relaxation technique that updates the relaxation factor dynamically at each rollstrip
coupling iteration. The resulting computing time is generally less than one second (on a single processor)
and convergence has been obtained for all types of cold and temper rolling conditions, from tandem mill heavy
reductions to double reduction of very thin strips and to very light reduction temper rolling (< 0.5%). Simulation
results are also discussed against finite element (FE) results. Finally, it is illustrated how this new roll bite model
can be used on an industrial database to develop accurate presets of roll force for temper mills.