Numerical Simulation and Parameter Design of Strip Cold Rolling Process of 301L Stainless Steel in 20-Roll Mill

With the rapid development of rail vehicles, 301L strip has become the main material of the rail vehicles, and its flatness quality has got much attention. Meanwhile, 20-roll mill becomes the most important cold rolling equipment for 301L strip forming, because of its high precision and wide application. To study the flatness control theory of cold rolling 301L strip in 20-roll mill, a finite element model is established based on elastoplastic theory. The stress–strain field is used to characterize the strip flatness under different rolling parameters. After analysis, the results show that the front and back tension have the most obvious effects on strip flatness. The friction coefficient and rolling speed are beneficial to the control of the strip flatness when they increase within a certain range.