Study on quarter-wave control of DP980 steel based on a bending force linear combination strategy

The high-order flatness defect of DP980 dual phase steel in the tandem cold rolling process has a great influence on the stability of strip production and the stable production of the following process. In this paper, a multipass simulation model based on ABAQUS was used to study the bending force of the S1 to S4 stands on the strip elongation deviation of DP980 in the process of cold rolling. The simulation results show that the work roll bending force (WRB) and the intermediate roll bending force (IRB) have different effects on strip elongation deviation. After fitting the regulation curve of the strip profile with the sixth-order polynomial and tenth-order polynomial, a bending force linear combination control strategy was established, which could only control the thickness of the quarter-wave defect position. The experimental results show that this strategy can reduce quarter-wave flatness defects from 18.22 to 10.87 IU.