Abstract: A deformation model of roll system in aluminum cold rolling mill applied to online control in the actual production， was established by elastic cantilever beam method and the influence function method processing ideas. The influences of working roll edge contact on the forces acting on the roll system and the cross-sectional shape of aluminum strip in the process of thin aluminum strip rolled by cold rolling mill were studied. The simulation study of different inlet strip thickness， bending force and the contact state of working roll were carried out. The results showed that the contact force of working roll edge increases with the increasing thickness of the entrance， and decreases with the increase of the bending force. When the working roll edge contacts with rolling mill， the difference between outlet strip crown and lateral thickness is less than the non-contact rolling， and this process is useful to reduce edge drop. However， as it reduces the regulatory capacity of the aluminum rolling mill for the edge plate， it should be avoided.

Key words: thin aluminum strip cold rolling, cantilever beam, influence function, working roll edge contact, roll system deformation, edge thinning