The dynamic variable specification control process of hot rolling is described in detail, and the appropriate control method is selected. Starting from the composition and control principle of the looper height closed-loop system, combined with the dynamic variable specification process, the dynamic variable specification constant sleeve control of semi-headless hot rolling is realized by feedforward control, and simulation experiments are carried out and the results are given. The use of semi-headless rolling technology in thin slab continuous casting and rolling production represents the highest level of continuous casting and rolling production lines in the world today. It can not only avoid the instability of the head and tail strips during finishing rolling, greatly improve rolling stability and productivity, but also reduce the fluctuation of the temperature of the strip coil throughout the length, greatly improve the quality of hot-rolled steel plates; at the same time, it can realize the smooth production of ultra-thin specifications (below 1.2 mm) hot-rolled plates, and replace cold with heat in the case of very fierce market competition, reduce costs and increase benefits. To realize the production of ultra-thin strip steel in semi-headless rolling process, dynamic variable specification technology is adopted. At present, the research on dynamic variable specification technology is mainly concentrated in the field of cold rolling. There are few research reports and literature on hot rolling dynamic variable specification technology for hot rolled strip steel. The industrial application of dynamic variable specification technology for cold continuous rolling has been relatively successful. However, hot continuous rolling headless and semi-headless rolling technology is a new technology that has only been developed since the end of the last century, and special research on dynamic variable specification technology, one of its key technologies, is still rare.
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