A methodology for cost and quality optimization in a design system by linking quality methods

摘要

A fierce competition and high customer expectations force manufacturing business to improve quality, to lower selling prices and to shorten delivery time. This also pressures into introducing new products in the market. This paper highlights linkages among QFD, SPC and Taguchi’s methods for a complete design process to be achieved; a global and integrative methodology is presented. Weaknesses of QFD is bottleneck engineering and optimization. The five-step model of QFD (as a customer-driven product design, the process starts with customer analysis) are extended by extra tools: SPC and Taguchi. The impacts of SPC and Taguchi on QFD have been studied and recorded. QFD provides with the customer’s input and Taguchi provides with the process to determine the best parameters of a robust design of SPC combinations. The voice of the customer is prioritized and expressed by functions, demanded quality, performances measures, failure modes, concepts and manufacturing. This synergy among QFD, SPC and Taguchi’s methods becomes an ideal design process able to perform concurrent engineering and integrated design. A methodological view is focused on here and particularly an integrated tool for cost and quality optimization within a design system.