Abstract
Warping in plate rolling causes the decrease in productivity, the deterioration in product quality, and at times damage of the equipment. Because warping is generally caused by multiple factors, it is difficult to quantify the effect of each factor on warping.
A non-steady state deformation model based on the rigid-plastic FEM was therefore developed to analyze warping phenomenon and is capable of dealing with the deformation of material during asymmetrical rolling. Analysis with this model was carried out at varying speeds of upper and lower roll speeds, coefficients of friction, and material temperatures.
Also a simulation model was developed by combining the non-steady state deformation model with a torsional vibration model of the driving system of a mill.
As the results of analysis by these models, the effect of asymmetrical conditions on warping depends on the shape factor ld/hm (length of contact/mean thickness).
Experiments were made in a commercial mill to verify these simulation models, confirmed that the analysis of warping phenomenon by means of these model is possible.
