Building the Theoretical Model of Roll Force in Rail Rolling by the Energy Principle

摘要

In rail rolling by universal mill, a simplified 3-dimention theoretical model has been built by solving the mean radius of the vertical roll with box pass firstly.Based on the kinematic principle, the admissible velocity field of the web, head and base of rail have been determined respectively. Moreover, the corresponding strain rate field and the strength of shear strain rate have been also obtained. Then the plastic deformation power of corresponding deformation zone, the power consumed on the velocity discontinuity surface and the power generated for backward slip and forward slip have been proposed.According to the energy principle, the roll force of horizontal roll and two vertical rolls can be obtained.Compared with the field data, the roll force from energy principle is somewhat greater than field data but in general do not exceed them by 13 percent. So, it is reliable and feasible to preset and optimize the parameter of rolling technology by the energy principle.