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Analysis and optimization of start-up process of two stand reversible cold rolling mill

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Document pages: 10 pages

Abstract: The dynamic characteristics of start-up process of double stand reversible cold rolling mill are analyzed. The delay algorithm of interlayer thickness is proposed. A new method for solving simultaneous equations is established by combining accelerated secant method and tangent method. The thickness and interlayer tension transition processes under different static tension establishment processes are analyzed. In the above process, both mills operate in constant rolling force control mode. The results show that the strip thickness in the rolling gap decreases during static rolling. The inlet rack runs in reverse to establish static inter rack tension. This area becomes the abnormal thinning area of the feed strip steel. It led to several abnormal interstand tension increases in the subsequent startup process. The tension increase leads to an impact force on the strip that is the main reason of the strip breakage in the startup process. So the static tension establishing process was optimized, and the interstand tension fluctuation and the strip breakage accidents both reduced significantly. The results are beneficial to the startup process of the two-stand reversible cold rolling mill.

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