Influence of roll with cone defect on shape in a six-high mill and its control model

Abstract

Cone defect in rolls may be caused by bad grinding. Cone defect leads to shape defect in unilateral waves of the finished strip. By using a six-high mill as example and by considering the features of the devices and technology, an influence model of roll with cone defect and a suitable shape control technology of a six-high mill was established to guarantee good shape. This model was then applied to a production practice of 1220 cold continuous rolling units. Quantitative analysis of different kinds of roll with cone defect and its effect on shape control shows that the additional shape caused by cone defect are unilateral waves. In conclusion, optimising the amount of tilt settings can effectively control the additional shape caused by cone defect, which provides enterprises with a useful reference for the high-precision control of shape.