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

To address issues with saturated work roll bending force (WRB), maximum contact pressure between the work roll and intermediate roll (QWI), and challenging flatness lifting in a four-stand, six-high tandem cold mill with a 1340 mm width, the density-based spatial clustering of applications with noise algorithm and the non-dominated sorting genetic algorithm II are used for optimal design and online application research of a five-segment work roll profile. When compared to a flat roll and a parabolic roll profile with a maximum crown of 15 & mu;m, the optimized roll profile decreases the secondary crown of the roll gap (CW2) by 5.99 and 1.055 & mu;m, respectively, and the fourth crown of the roll gap (CW4) by 0.21 and 0.39 & mu;m, respectively. Additionally, QWI in the field of roll gap crown adjustment decreases by 1.04 and 0.445 kN mm(-1). Industrial testing shows that the average integrated value of flatness in rolling the four extreme specifications of 1340 mm tandem cold-rolling mills lowers by 2.65 IU following the application of the new roll profile, and the average reduction of WRB in the last stand is 2.215 MPa.