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| Calculation Method of Flatness Index in Cold Rolling |
| BAO Ren-ren1, ZHANG Jie1, LI Hong-bo1, GONG Gui-liang2, JIA Sheng-hui2, LIU Hai-jun2 |
1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. General Cold Rolling Plant, Wuhan Iron and Steel Co., Ltd., Wuhan 430083, Hubei, China |
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Abstract Most of the tandem cold rolling mills are equipped with one or two flatness measurement device used for real-time control and flatness assessment of the strips. Distribution of transducers is different and uneven. Flatness index is an important parameter to characterize cold-rolled strips, which is provided by the automatic flatness control system and usually presented by IU (I-Unit). In order to express the flatness of strips exactly, the calculation method of an actual flatness control system provided by SIEMENS was analyzed, and the effect of uneven distribution of the transducers was considered. On this basis, linear interpolation was introduced to build an even and transverse elongation distribution model, and the formal flatness index calculation method was modified. Verified by actual flatness data, the new method was independent of the distribution of transducers, which improves the comparability of flatness of strip produced by different cold rolling mills.
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Received: 29 April 2014
Published: 02 December 2014
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2014, Vol. 49 
