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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 8715340, 10 pages
https://doi.org/10.1155/2017/8715340
Research Article

Analysis of Startup Process and Its Optimization for a Two-Stand Reversible Cold Rolling Mill

1Heavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan University of Science and Technology, Taiyuan 030024, China
2Cold Rolling Plant, Jinan Iron and Steel Group Co. Ltd., Jinan 250101, China

Correspondence should be addressed to Guangming Liu; moc.621@8002uilthgirb

Received 20 May 2017; Accepted 28 August 2017; Published 10 October 2017

Academic Editor: Marco Rossi

Copyright © 2017 Guangming Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dynamic characteristic analysis of a two-stand reversible cold rolling mill in the startup process was carried out. The delay algorithm of the interstand thickness was proposed. A new method combined with the accelerated secant and the tangent methods was established to solve the simultaneous equations. The thickness and interstand tension transition processes with different static tension establishing processes were analyzed. Both mills were operated under constant rolling force control mode in the above process. The results show that the strip thickness in the rolling gap reduces in the static mill screwdown process. The entry stand runs inversely to establish the static interstand tension. This area becomes an abnormal thickness reduction area of the incoming strip. It results in 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.