Research On The Capacity Flexibility Of Manufacturing Process And Its Quality Control

With the acceleration of the process of economic globalization and new technological development, the living environment of enterprises have changed enormously, the requirements of individuality and diversification of the customers have been increased, and the competition of the market is more and more severe. As the adjustment and adaptive capacity of the enterprises facing the ever-changed and uncertainty of environment, capacity flexibility is an important guarantee for enterprises to accomplish quick reaction capability of market and obtain the maximum benefits. In the thesis, it focused on capacity flexibility and its'quality control technologies in discrete manufacturing process for manufacturing enterprise. The main research works are as follows:(1) In order to meet the uncertain environment for enterprises, the characteristics of discrete manufacturing enterprise and capacity during manufacturing process were analyzed and studied, the concept of capacity flexibility of manufacturing process was summarized and analyzed; based on the analysis of the influencing factors of capacity flexibility, quantitative analysis of capacity flexibility was accomplished, and the key technologies of capacity flexibility were determined.(2) Based on the understanding of general quality and quality control, the concept model and quantitative analysis methods of capacity flexibility were combined, and then the influence of quality control during manufacturing process on estimation indicators of capacity flexibility was researched, the relational model between capacity flexibility and quality control was established, through analyzing the relational model, quality control of manufacturing process is an important way to realize capacity flexibility, and capacity flexibility is integrated representation of quality control.(3) As an important constitution for productive and technical preparation of manufacturing process, design of process specification of product has great influence on the product quality, manufacturing cost and production cycle. In order to achieve the overall optimization of flexible manufacturing capacity and accomplish the minimum of process time and cost, multi-objective optimization model of parts'process specification on condition of general constraint condition for manufacturing process was established. Based on the complication of optimization design of process specification, the optimization strategies of process specification were studied by means of improved genetic algorithms. And taking the multi-objective optimization of process specification of big modulus gear as the object, and application example was given. (4) Aim at the problem that general control chart doesn't meet quality control of multi-varieties and small batch for discrete manufacturing, the technique of quality preventive and control based on part'individual-moving range process was investigated; the technique based on the effective integrated ideas of quality analysis and control of Six Sigma and Lean-production was improved, the integration system of quality control was established and the function and operational process of main module were analyzed and described. At last the system established was proved to valid by the application example in manufacturing enterprise.