FEM Simulation of the Roll Deformation of Six-high CVC Mill in Cold Strip Rolling
Accurate prediction for the deformation of the roll system is a key to improve the accuracy of the preset model and on-line control model of strip cold rolling processes. A non-linear finite element contact model to simulate the roll system deformation has been developed for the CVC-6h cold strip rolling mill. The elastic-plastic deformation of the strip and the elastic deformation of the rolls are coupled in this model by the contact and friction between the roll and strip. The effects of the work roll bending force, the middle roll bending force and the middle roll transverse shifting on the roll gap profile have been analyzed systematically. Results show that the work roll bending is the most effective mean in these strip shape controlling means. The calculated roll gap profile is close to the measured values. This model can improve the accuracy of final products through a correct preset model and on-line control model of strip shape.
Simulation of plane-strain rolling by the rigid-plastic finite element method
Abstract The rigid-plastic finite element method for a slightly compressible material is applied to steady and non-steady state strip rolling. Solutions for some technical problems using a finite element analysis for rolling process are given. Stress and strain distributions in steady state plane-strain strip rolling under the condition of a constant coefficient of friction are calculated for work-hardening and non-hardening materials. The calculated distribution of roll pressure exhibits a peak at the entry which does not appear in the analysis by the slab method. Non-steady state deformation of the front and tail ends is also analysed. The calculated end shapes are in good agreement with the experimental ones for aluminium strip.
Finite-element analysis of a hot-rolling problem with nonlinear friction
Abstract An isotermal, steady-state, hot-rolling problem of a workpiece with rectangular profile is considered. The workpiece material is assumed to be rigid-plastic, strain-rate sensitive and slightly compressible. The existence of a thin layer is supposed, where nonlinear Siebel's type friction is assumed to hold. Several examples of rolling problems at different rolling conditions are solved numerically by an finite-element-secant-modulus method. Comparisons with experimental results are performed. The effect of the friction factor, workpiece reduction and rolling velocity on the relative contact velocity, roll pressure and effective strain rates is illustrated and discussed.