Design and Application of Variable Contact Backup Roll Contour and Configuration with Work Roll Contour in a Hot Wide Strip Mill

摘要

Within more than one years production alter 2250 mm riot btrip Mill of Qian'an Iron and Steel Company of Shougang Steel Corporation was commissioned in the end of 2006, roll spalling and Hroken accidents had happened many times even more seriously on the second stand of roughing mill (R2) , and resulted to enormous economical lost. In addition, there was also another issue of lower control precision for strip shape to be solved. Not only for solving the roll spalling and broken problems but also raising the control precision of strip shape, one kind of variable contact back-up roll contour curve (VCR) with a six order of polynomials and negative crown contour were designed and applied respectively on back-up rolls of all mill stands and work rolls of roughing mill stand Rl and R2 instead of conventional flat roll contour. After the application, roll spalling, crown and wedge quality of the transfer bar and strip shape quality were all improved.