Research On Several Key Issues In Quality Cost For Automakers

This dissertation discusses the three key issues in the research field in China and abroad on quality cost i.e. quality cost optimization model, quality cost measurement and quality cost control system,and make a practical research for automakers.The quality cost optimization model mainly reflects the correlation between the product quality level and the product quality cost. It also identifies the composing elements of quality cost and determines the relationship between them. It is an important item in quality cost management. Based on the analysis on the traditional quality cost optimization model and that under zero-defect, the dissertation points out the limitations exist in these two models. Finally, the author establishes a new quality cost optimization model under the guideline of 6 sigma quality management theory by introducing the"Learning Curve"effect and recognizing the significance of the implicated quality cost.The dissertation makes a summary of the major methods in quality cost measurement used in China and overseas namely PAF method, Process Cost Method, Operation Cost method and Quality Loss Function method. A comparison study is also made between these methods. Then it focuses on the study of the hidden quality cost which is one of the main components in quality cost. On the basis of analyzing the value theory of the enterprise, the dissertation presents the standard analysis form and estimation model to estimate the hidden quality cost using the enterprise value variation. At the end of the chapter, Mitsubishi Motor Corporation is used for a case study.This dissertation analyzes the traditional quality cost control system which is orientated by cost control, i.e. determining quality cost by the established quality level and controlling it with the target cost control principle. This paper points out its limitations and brings forward the quality cost control system oriented by quality control. This quality cost control system is under the guideline of the quality cost optimization model with zero-defect. That means the product quality does not need to be determined since it is already set with zero-defect or six-sigma pursued. Therefore, the quality cost of the enterprise is the best of all when zero-defect or six-sigma is realized.