Study On Work Roll' Thermal Crown Of 1700 Five Stands Cold Tandem Mill

The roll's thermal deformation is an important factor for the strip shape in cold rolling process. It is difficult to control the strip shape and quality and accurately predict roll's thermal deformation because the influence factors are complicated, the boundary conditions are intricate and many physical parameters are hard to measure. This paper takes a five-stand 1700 UCM cold tandem rolling mill as research subject. The heat exchange boundary conditions are analysed and in-depth study of rolling process of thermal parameters and influencing factors are taked. The differential formula of roll's temperature field is provided by the energy balance method, and a mathematic model for calculating the work roll's temperature field is established.A complete simulation system which including sub-cooling simulation, calculation of rolling force and energy parameters, calculation of friction heat and plastic work, simulation of temperature field and thermal crown, treatment of the result is developed by using the software of MATLAB. Some new parameters such as regulation domain, control-efficiency factor, saturation control point are proposed in this paper, and these new parameters provide a new research angle for thermal deformation. By using the simulation software, the water beam's regulatory domain and control-efficiency factor are studied, and the effect of these parameters on the thermal crown is obtained. Furthermore, the influence of the diameter of the roll, rolling reduction, friction coefficient on the thermal crown and the roll shape under section cooling are also calculated.Finally, the simulation platform's calculation accuracy and practicability are verified by comparasion the results of the platform and the result of the finite element software MSC.Marc that obtained through secondary development and the on-site data of 1700 cold tandem mill.