Synergistic optimization of shape-force and dynamic coupling effect in bending roll systems during accelerated...

During the acceleration phase of continuous cold rolling mill production, transient transitions in rolling speed can lead to dynamic imbalance in the rolling force field. This imbalance induces fluctuations in strip thickness and shape distortions (such as edge waves, center waves, and other defects), which have become critical bottlenecks restricting the quality of high-end cold-rolled products and production line efficiency. Based on the ABAQUS platform, this study constructs a three-dimensional elastoplastic finite element model of a six-roll continuous cold rolling mill, systematically revealing how Work Roll Bending (WRB) and Intermediate Roll Bending (IRB) couple to affect the dynamic response of strip thickness distribution, flatness evolution, cross-sectional crown, and rolling force field. The results demonstrate that increasing WRB shifts the strip thickness distribution from "thick center, thin edges" to "thin center, thick edges," significantly improving secondary wave defects. Increasing IRB promotes more uniform thickness distribution, but its control capability over quaternary wave defects is relatively weaker. Bending force effectively suppresses shape fluctuations by adjusting rolling force distribution and inter-roll pressure. For the acceleration process, a composite control strategy integrating dynamic bending force compensation and tension cooperative control is proposed, and a segmented speed interval optimization model is established. Simulations show that through segmented speed interval optimization and dynamic compensation, edge wave defects during the acceleration phase are reduced, and thickness uniformity is improved. Optimizing the strip production process during acceleration can effectively enhance production efficiency and reduce production losses. The research outcomes, by establishing a multi-objective coordinated dynamic shape control system, provide theoretical support and engineering implementation pathways for the intelligent process optimization of continuous cold rolling mills during acceleration.