Multi-objective optimization of rolling schedule based on cost function for tandem cold mill

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.