The Research On Flatness Control Of Thin Strip With UCM Cold Rolling Mill And Finite Element Simulation

It is general considered that Cold-rolled thin strip has a major role in nationalinfrastructure, frankly speaking, they are widely used in automotive industry, electrical,precision instruments, food packaging, home appliances and so on. Due to difficulties ofcold-rolled strip shape control, it caused low yield and product quality, and could not meetbusiness and customer demand. So it is significant to research flatness control technologyand improve the accuracy of online flatness control to enhance the yield and productquality and reduce energy consumption and production costs. This topic is originated fromSteel Plant, which often made the edge-drop defects at the side of the plate-shaped regionsduring the production process of UCM cold mill thin strip production line. To solve theproblem of the plate-shaped defects and improve the quality of shape control, it conductedmuch research related to shape control, the research projects are as follows:1) Established calculation model coupling with strip and roll in ABAQUS, accordingto provided drawings of UCM Steel cold rolling mill from the iron plant. simulate therolling process successfully2)By finite element analysis, it researched the effect of different plate thickness、reduction ratio、the entrance width、front/back tension、Intermediate roll shifting、Workroll bending force、Intermediate roll bending force to the discipline of strip crown, edgedrop, strip and work roll contact stress distribution. The results showed that the reductionratio, the amount of intermediate roll shift, and bending force are major factors ofaffecting plate-shaped.3) Combined with the actual rolling conditions and the above simulation results, andthe shift of intermediate rolls and the amount of bending force, it suggested that theintermediate roll ends with roller-shaped curve and a certain amount of taper curve shapeon the work roll ends is the best policy for edge drop control strategy.