Effects of rolling conditions on edge-drop of cold rolled strips - development of technology for reducing edge-drop of cold rolled strips by pair-cross mill Ⅳ

摘要

Effects of several rolling conditions on the thickness deviation of cold-rolled strips, the printing ratio of the roll crown to the strip crown and the crown transfer coefficient in cold rolling have been investigated using the 3-dimensional slab method. Strip thickness has an important effect on these characteristics, and normalized thickness deviation, which is defined as the inverse of rolling force per unit width, and the region in which edge drop occurs become large with increasing strip thickness. These findings indicate that Pair cross mill should be arranged in up-stream stands of tandem cold mills to reduce the edge drop of strips. The thickness deviation of strips predicted using the roll crown printing ratio and the crown transfer coefficient agrees with the one measured using the new commercial tandem cold mills, where Pair cross mills are introduced from the first to three stands.