Precise and Efficient Plate Rolling Technology on Pair Cross Mill

摘要

The world's first PC plate mill introduced at Kimitsu Works of Nippon Steel Corporation has contributed greatly to remarkable improvements in yield, product quality and productivity. This paper has described the outline of the PC plate mill and its control system, and the results of its practical application. The large capacity of crown control of the PC plate mill has performed best with the new on-line control system consisting of theoretical plate shape and crown model. The most salient feature of the PC plate mill is that the number of passes can be reduced by applying high reduction rate rolling. The fewer the number of passes, the higher the rolling efficiency. This has been achieved by constructing the new draft scheduling logic which enables high reduction even in the final stage of finishing rolling. Results of practical application of the PC plate mill have shown remarkable improvement in plate shape, crown and in rolling efficiency.