Profile Control Of Six-high Mill Based On Contact Finite Element

Profile is one of the most important indexes of strip quality, moreover, the profile control is the key technology in steel. To meet the need of high quality and productivity in strip milling, profile control is required to have a higher precision, as well as higher on-line regulation.This paper analyzed the advantages and disadvantages of profile adjustment technology and its related apparatus which have been regularly used at present. The six-high mill elastic deformation formula was derived on the basis of the research and analysis on differ elastic deformation theories of rolls (for example, the method of freely supported beam,the method of composite beam,the method of spring beam,the method of influence function, etc). Furthermore, based on the theoretical knowledge of Mechanics of Materials and Theoretical Mechanics, the strip crown theoretical formula was derived too. Taking advantage of the powerful nonlinear contact analysis functions of MSC. MENTAT/MARC, this paper accomplished the analysis of profile control model which targeted the six-high mill. Moreover, this paper established eight finite element sub-model which was about the relationship between the degree of profile crowning and profile width, roll diameter, intermediate roll diameter, bearing roller diameter, roller channeling roll, in the middle roll channeling roller, Work Roll Bending strength, Roller is among Bending Force and other factors. The law about the impact of those factors'changes on the profile crowning was found out through the calculation of the fixed width of the profile. Meanwhile, after the calculation of different profile widths under a specific influencing factor, the impact rate was worked out, which caused by many factors on the profile crown of different strip width.Then with the mathematical tools MATLAB, the curve was worked out. It shows the impact on the crown changes of fixed width strip, and the impact rate of the crown changes of different width strip, which are all caused by these factors.The paper adopted MSC.MENTAT/MARC nonlinear finite element analysis and calculation of contact function, and treated roll as elastic pieces and workpiece as elasto-plastic respectively, finally accomplished the crown of the theoretical analysis and finite element model. This study provided a more accurate algorithm for the further research of profile control, it supplied partial governing for production department.