Study On Flexsible Machining Line And Workshop Planning Methods Based On Polychromatic Theory

Workshop planning is a very complicated issue which involves multi-subject-crossed technology, such as parameter designing, artificial intelligence, graphics, information processing, optimization and simulation. Traditional production line and workshop planning method becomes difficult to satisfy flexible multi-product machining production planning needs. This paper deals with the subject " Study on Flexible Machining Production Line and Workshop Planning Method Based on Polychromatic Set Theory" , on the basis of full research of conventional planning theory and technology and in association with practical needs of a new plant planning of Hefei Auto Axle Company, which is theoretically and practically significant for flexible multi-product machining production planning and helps to reduce manufacturing cost, increase production efficiency and corporate market competitiveness.This paper fully researches conventional planning theories and methods and understands the short points of conventional planning methods. By hierarchical planning concept and mathematical tools of polychromatic set theory, it systematically studies the workshop planning methods which involves classification of geometric features of products, determination and optimization of processes, selection and optimization of equipments and layout and optimization of production lines and workshops from very original information of geometric features for a product family. It builds up mathematical models and provides solution algorithms.By the similarity of products, it investigates the geometric features of a product family and their processing methods and establishes the relation matrix between the geometric features and processing methods by means of polychromatic set theory. Then it further optimizes the processing methods by the tact time of the production line, process constraining attributes and the relation matrix between the geometric features, obtains optimized a balancing rate of the production line, and generates a feasible equipment sequence.This dissertation establishes a production line layout model based on the "one-piece flow" concept, which increases human loading rate and utility rate of production area by optimizing the layout model with human loading rate and facility distance. It further puts forward a new workshop layout method based on product structure trees , builds the workshop layout model and gives a solution algorithm. Besides, it has evaluated and the layout of the production line and workshop resulting from the above theoretical method with the help of fuzzy comprehensive evaluation and improved AHP models and made the optimal choice.Meanwhile, this paper tesiifies the effectiveness and practicality of the theoretical models. It uses e-Mplant simulation software to establish the simulation model of an axle housing machining line and simulates and analyzes two feasible machining line layouts. It uses E-Factory simulation software to establish the simulation model of a rear axle workshop and simulates and analyzes two feasible workshop layouts and gets the better choice. The simulated results and an applied actual case show that Flexible Machining Production Line and Workshop Planning Method Based on Polychromatic Set Theory is effective and practical. This method is able to increase the production flexibility, equipment loading rate, production balancing rate, ground area utility rate and reduce transportation cost and investment.