1993 Volume 79 Issue 3 Pages 332-338
This paper describes a new approach of pass schedule design for hot strip rolling. Recently theoretical optimization techniques have been applied to obtain the optimum schedule instead of the usual power curve. In this method, the pass scheduling is treated as a single objective programming problem. There are plural objectives in the pass design, which are to satisfy the thickness specification and the temperature specification, to attain the high productivity, and so on. The conflict of the objectives is not considered and the conflict can not be modified.
In order to solve these problems, the pass schedule is formulated as a multi-objective programming problem in which the objectives are thickness, temperature, flatness, productivity (rolling time) and cost (rolling energy). A multi-objective optimization technique is applied to obtain the Pareto optimum solution. The interactive fuzzy satisficing method is employed to reflect the pass designers preference and modify the conflicts.
Through the numerical simulation, it is confirmed that the interactive fuzzy satisficing for multi-objective programming problem can generate the reasonable pass schedule which has a small amount of scatter in the grade for each objective, compared with the usual approach.
