TAILIEUCHUNG - Nondestructive Evaluation and Quality Control (1998) Part 16

Tham khảo tài liệu 'nondestructive evaluation and quality control (1998) part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | those manufactured in Japan The warranty cost bars shown in Fig. 5 have been plotted at the extremes of the two distributions of the critical dimensions to depict the relative costs associated with variability. It is clear that for the . transmissions the cost associated with repair and replacement is significantly larger than that for their Japanese counterparts. This comparison of the economic data associated with the two transmissions would suggest that there exists a definite relationship between variability and cost in terms of loss incurred due to functional variation. One could think of the warranty costs as literally mapping out the loss function. Fig. 5 Loss function interpretation of the engineering specifications in Fig. 4 in terms of warranty costs Robust Design Approach to Quality Design The design process in general and the design manufacturing interface in particular have received considerable attention over the past 20 years. Computer-aided design and manufacture has dealt primarily with the computerization of the design and manufacturing processes and in particular with the translation of design specifications into manufacturing procedures and activities. The computer has greatly facilitated this translation and as a result lead times have been reduced. Design modeling and analysis have been strengthened and extended. Standardization and rationalization of both design characteristics and manufacturing process characteristics have been advanced and the efficiency of the interactive process at the design manufacturing interface has been improved. The concepts of design for manufacturability and design for assembly have been the subject of considerable research and development. Numerous specific models have been proposed and refined and will not be discussed here. This work is aimed at overcoming the difficulties precipitated by the traditional over-the-wall design philosophy. The magnitude of the problem with the over-the-wall approach to design .

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