Surface wrinkles of cold rolling strips on the uncoiler

In order to solve the problem of cold rolling strip surface wrinkles on the uncoiler, the stress distribution of a cold rolling strip on the uncoiler and its influencing factors were investigated by finite element method. The linkings of the uncoiler tension, strip thickness, adhesion degree and coil radius on the wrinkles were analyzed. Some measures to avoid the wrinkles were put forward by minishing the reverse bending degree of the strip on the uncoiler and the adhesion degree in the bell annealer. It is pointed that increasing the uncoiler tension can minish or avoid the wrinkles.