Slab design method for medium and heavy plates oriented to yield rate control and optimization

To improve the slab yield rate in the production of medium and heavy plates in iron and steel enterprises, and address issues such as excessive unplanned material feeding and over-reliance on the experience of planners, this paper, based on the actual production condition of medium and heavy plates at Xiangtan Iron and Steel Co., Ltd., analyzes the whole-process mathematical model for the slab design of medium and heavy plates, and studies and constructs a set of medium and heavy plate slab design methods and systems oriented to yield rate control and optimization. Based on the idea of hierarchical modularization, this method establishes a standardized slab design rule model, introduces additional large-slab design rules to supplement the large-slab design and arrangement system, optimizes the selection logic of rolling directions, the margin reservation strategy for slab feeding, and the dimension correction method, and constructs an intelligent slab design algorithm. This algorithm, which incorporates mutually independent slab design constraints, is developed on the basis of mixed integer programming (MIP) and constraint programming (CP) theories, and yields results oriented toward multi-objective optimization. This system has been put into operation, and operational results indicate that it has enhanced the flexible adaptability between the enterprise′s slab design methods and business operations, reduced the generation of residual materials, improved the slab yield, while the yield control strategy has increased the plan fulfillment rate of slab production, and the intelligent slab design algorithm has reduced employees′ workload and improved the quality of production plans, thereby demonstrating favorable application value and promotion potential overall.