Improvement on edge drop in cold rolling of silicon steel

Since silicon steel is used in a laminated form, thickness profile in the width and the rolling directions should be accurately controlled. It is well known that the phenomenon of edge drop is one of very serious problems in cold rolling of silicon steel. In order to determine one of the better methods for reducing edge drop, a computer simulation was carried out in this study under various rolling conditions. It was found that the better way to reduce edge drop was to use a tapered work roll. A table was given for the optimal taper crown depending upon the diameter of work roll and the width of strip. The optimal condition was applied for actual cold rolling of silicon steel. As a result, edge drop was significantly alleviated.