A comparative study of slabe, upper bound and finite element methods for predicting force and torque in cold rolling

Abstract

Rolling force and torque are often measured during the rolling process and their magnitudes used in the process control algorithms. Slab, upper bound and rigid-plastic finite element methods have been applied for predicting force and torque in rolling. This paper compares the results of these methods and that of DEFEL (an elastic-plastic finite element code) with experimental data. It is concluded that slab and upper bound results are very approximate. The rigid-plastic finite element method is fairly accurate for low R H 0 (roll radius by sheet half thickness) ratios. However, for large R H 0 ratios (> 100) the elastic response of the roller has to be considered. Elastic-plastic finite element results, on the other hand, are found to have reasonable agreement with experimental data for all R H o ratios.