Influence of Roll Profile Configuration on High-Strength Strip Flatness Control Performance in Tandem Cold Rolling

Abstract

According to the characteristic of high-strength strip, the roll profile configuration and change of CVC tandem cold mill are analyzed. Through the establishment of FEM model, the influences of three representative forms of roll profile configuration on high-strength strip flatness control in CVC cold rolling mill are compared, which are conventional back-up roll / CVC intermediate roll, back-up roll with CVC compensation / CVC intermediate roll, VCL+ back-up roll / HVC intermediate roll. Compared with the other two roll profile configuration, the configuration of VCL+ back-up roll / HVC intermediate roll increases 26.74% in crown adjustment domain of roll gap and 22.09% in lateral stiffness of roll gap, decreases 27.43% in contact pressure peak values between rolls. The new roll profile configuration has obtained industrial applications. Production data indicate that the control accuracy of high-strength strip is improved, also the wear of back-up roll. Significant application results have been achieved.

Method for Determining the Optimum Counter-Flexing Force of Working Rolls during Sheet Rolling

“…It is shown that the roll gap geometry significantly influences on the evolution of the strain state and depends on the ratio of the contact length between the roll and the sample to the sheet thickness. During cold rolling the form of the roll gap is not constant [5], and depends on the properties of the metal, the type of mill, the rolling pressure, the length of the rolls, the location of the back-up rolls and other factors [6] that affect to the flatness of the rolled products and should be taken into account in AASPS of the strip. The shape of the working roll profile is calculated analytically or measured experimentally, and then automatically adjusted depending on the rolling conditions [7].…”

Asymmetric Shape Control Ability and Mutual Influence of the S6-High Cold Rolling Mill

“…The S6-High cold rolling mill, the focus of this article, serves as the key apparatus for manufacturing high-strength steel. Similar to the 6-High cold rolling mill, it incorporates the Intermediate Roll Bending (IRB) and Intermediate Roll Shifting (IRS) methods for strip flatness control [1][2][3]. Nevertheless, during production, the issue of asymmetric strip flatness frequently arises due to variations in input material performance and inadequate dimensional accuracy of the mill, which cannot be effectively resolved using conventional symmetric control.…”

“…where x s and y s is the centre position of the work roll; R w is the radius of the work roll in millimetres; R s is the radius of the side support roll in millimetres; h is the thickness of the strip at the exit in millimetres; and α 1 is the angle between the side support axis and the horizontal in degrees. Simultaneously, based on the overall force balance of the roll system and the local force balance of the work roll, the force exerted on the side support can be calculated as shown in Equation (3).…”

Optimization of Multi‐Segment Work Roll Profile for 1340 mm HC Tandem Cold‐Rolling Mills Based on DBSCAN and NSGA‐II Algorithms

“…Roll profile optimization must take mill characteristics and equipment conditions into account to provide targeted roll profile parameter adjustments. [ 6 ] Moreover, when optimizing the roll profile, it is important to consider mechanical transmission and safety requirements of the production line to ensure stable production operation. To minimize axial force, Lu et al [ 7 ] designed a three‐time CVC roll profile and analyzed the roll gap control principle of the CVC roll.…”