Research And Application On Production Planning Of Free Hot Rolling Mode For Heavy Plate In Steel Industry

By the impact of the growing global demand and intense market competition, the iron and steel industry is facing a series of serious challenges. Lack of energy supply and intensive market competition require to reduce the cost in the production as much as possible, which means more advanced methods in production planning are necessary. The batch planning in hot rolling production is an important function of production and management of steel enterprise, which gives a direct influence on production quality, due date and the economical benefit of steel enterprise. The effective methods of batch planning in hot rolling production are crucial for production efficiency, production cost and economical benefit. The technology of heavy plate hot rolling is the one of important processes in steel enterprises, whose progress accompanies with the rolling technology development. The related scheduling methods for hot free-rolling mode also have a constant changing and improvement.The Practical production process of ShouGang Group is taken into account. The production process of heavy plate hot rolling strip, scheduling constraints and rules are illustrated firstly. The VRPTW (Vehicle Routing Problem with Time Windows) model is suggest that is suitable to resolve the problems of the production lot planning in hot rolling process is suggested. All hot rolling constrains have been considered and the objectives of the model are to assign slabs into less plans and to increase the hot charge ratio. An evolutionary algorithm combined with expert system is proposed for solving this model. The simulation with real production data shows that the model and algorithms are feasible.Based on the above-mentioned methods, a hot rolling heavy plate production planning and scheduling system has been developed using C# and Oracle 10g database. Testing with a large number of production data shows that the rolling scheduling system is feasible and reliable, the production cost is reduced and the hot charging ratio is increased.