Development Of A Production Planning System For Continuous Casting And Hot Rolling

In this paper, the problem of production planning of continuous casting and hot rolling is investigated. Based on this problem, the model of the production planning of continuous casting and hot rolling is constructed and then is solved by using the heuristic algorithm and the intelligent optimization algorithm. Moreover, the production planning system for continuous casting and hot rolling is designed and developed. The main contributions of this dissertation are as follows:1. The background of the production planning of continuous casting and hot rolling in a steel company in Jiangsu Province is described, including products, production lines, production capacity and system requirements. After collecting the related information and analyzing the given data, we obtain the key information and create some important tables for representing the data. According to the above results, the global mathematical model of the production planning of hot rolling and continuous casting is constructed with the objectives of minimizing the times of switching the rollers in the hot rolling period and the number of casting (ladles) in the continuous casting period. We also develop a simplified mathematical model of the production planning of hot rolling with the same objective as in the global model.2. A heuristic algorithm based on earliest due date and maximum production capacity rules is successfully applied to solve this problem. So we could get satisfactory results of production planning of hot rolling and continuous casting. In order to attain more optimal results, we utilize the particle swarm optimization (PSO) algorithm and genetic algorithm (GA) for the global and simplified mathematical models respectively. Finally, differences among the performances of the above three algorithms are analyzed and discussed.3. The production planning system for continuous casting and hot rolling is designed, which is consisted of three layers:the GUI layer, the Business Logic layer and the Database layer. Then, the functions of every layer are explicitly determined. Moreover, the environment of both developing and running this software is introduced. Lastly, the primary tables of five information data modules, i.e., user information data, demand information data, constraints information data, middle results information data and final results information data, are designed in details, based on which the logic relationship of these main tables is explained.4. The production planning system for continuous casting and hot rolling is developed step by step according to design of the three-layer structure. In the Database layer, the procedure of automatically transferring Excel orders into the corresponding table in Database is illustrated. In the Business Logic layer, the key static functions of this system is listed and the some design optimization methods are applied for better extension performance of the system. In the GUI layer, specific interfaces of five modules, i.e., user module, demand input module, industry constraint module, middle results module and results output module, are displayed and some key codes are also shown. Besides, the results of production planning of both hot rolling and continuous casting is conveyed in the form of excel by using the crystal report technique.