Perfection of a modelling method of cold rolling mill rollers profiling to increase accuracy of rolled strip cross profile forming

Abstract

Profiling of rollers, apart from the means of inter-rollers gap control, determines the accuracy of rolled strip cross profile forming and their flatness. A number of articles is devoted to the items of rollers profiling modelling. Based on their study a task of development of strip mill rollers profiling modelling methodology formulated. The methodology based on working rollers generating lines building by geometric summarizing of grinding curves, curves of thermal profile and wear profile curves with elastic deformation curves and further elaboration of a perfected profiling of the 2100 mill roller system to provide the quality world level, characterized by δhпоп index. The elastic deformation curves defined by the finite elements method. Results of modelling of convexconcave CVC profiling of cold rolling mill working rollers quoted. The elaborated and adopted to implementation at the 4-high 2100 mill perfected CVC profiling of working rollers presented, which provides increase of accuracy of rolled strips cross profile forming. The solution based on the mathematical description of quarto roller system loading and deformation, accounting the convex-concave CVC rollers profiling and axes shifting of working rollers. Simulation of loads and elastic deformation of the PAO “Severstal” 4- high cold mill roller system accomplished by application of SIMULIA Abaqus program complex. Accounting symmetry of the task, only one roller half-set considered – the upper working and bearing rollers with CVC profiling. The barrel edge slope taken into consideration in the bearing roller model. Application of the new working rollers profiling will increase the efficiency of their axes shifting and hydro-bending during rolling of 900–1300 mm wide strips, which account the main share of the rolled metal at the mill, with the guaranteed provision of the strip cross crown, not exceeding 2% of the nominal thickness.