Multi-objective optimization of rolling schedule based on cost function for tandem cold mill
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：陈树宗 ZHANG Xin(张欣) 彭良贵 张殿华 孙杰 LIU Yin-zhong(刘印忠)
文章页码：1733 - 1740
Key words：tandem cold mill; multi-object optimization; rolling schedule; cost function; simplex algorithm
Abstract: In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost function was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost functions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.
CHEN Shu-zong(陈树宗)1, ZHANG Xin(张欣)1, PENG Liang-gui(彭良贵)1, ZHANG Dian-hua(张殿华)1, SUN Jie(孙杰)1, LIU Yin-zhong(刘印忠)2
(1. State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China;
2. Wei’er Automation Co., Tangshan Iron & Steel Co., Hebei Iron & Steel Group, Tangshan 063020, China)
Abstract:In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost function was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost functions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.
Key words:tandem cold mill; multi-object optimization; rolling schedule; cost function; simplex algorithm
