Abstract
In order to analyze the influence of technical parameters on work roll axial force of four-high continuous variable crown (CVC) mill, the deformation analyzing model with top roll system and strip was established based on influence function method. Then a CVC work roll curve designing scheme was proposed and it was carried out on some cold rolling mill considering the requirement of comprehensive work roll axial force minimization. The status of comprehensive work roll axial force is improved considering the rolling schedule that is beneficial to the roller bearing. Corresponding to the newly designed work roll contour, the backup roll end chamfer was designed considering comprehensive performance of interroll stress concentration, comprehensive work roll axial force, and strip shape control ability. The distribution of roll wear with newly designed backup roll contour is more even according to the field application data. The newly established roll configuration scheme is beneficial to four-high CVC mill.
Highlights
Rolling process simulation is a feasible method to analyze the rolling technology and characteristic of equipment and control system
Influence function method is always chosen for fewer assumptions, faster calculation speed, and better calculation accuracy which satisfy the requirement of project well
It is first proposed by Edwards and Spooner [1] based on the work of Shohet and Townsend [2], improved by Nakajima [3], Tozawa and Ishikawa [4], and Wang [5] subsequently, and the influence function method has become relatively sound
Summary
Rolling process simulation is a feasible method to analyze the rolling technology and characteristic of equipment and control system. Work roll contour design method considering the effective crown control range corresponding to the maximum strip width. Liu et al [26] analyzed the influence of strip width, shift position, bending force, backup roll crown, and parameter of circle and parabolic chamfer on interroll contact pressure distribution. A new comprehensive work roll axial force calculation method was established considering the comprehensive work roll contour with backup roll and strip. A new work roll contour designing method was proposed considering the comprehensive work roll axial force minimization, work roll diameter difference minimization, and rolling schedule. Corresponding to the newly designed CVC work roll, the backup roll end chamfer was optimized by minimization of objective function value composed of interroll force concentration, comprehensive work roll axial force, and shape control ability. The roll contour configuration scheme for four-high CVC mill is established systematically
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