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The process quality index (PQI) system and quality-oriented statistical tolerancing have been discussed based on three PQIs, which provides a standardized interface between process quality requirements and control chart design. An integrated statistical approach to specification, production, process monitoring and inspection can be realized via using quality-oriented statistical tolerancing. By adding...
Current SPC charts are process monitoring tools for keeping process in stable status, and cannot assure a desired process quality without additional requirements. To develop a quality-oriented SPC approach, a standardized interface between process quality indices and the parameter design of control charts, i.e., quality-oriented statistical tolerance (QOST), is needed. QOST can be determined based...
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