Product Capability Evaluation Models

• Main Authors: Huang Mei-Ling, 黃美玲
• Other Authors: Li, Rong-Kwei
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/45120578726224867886

博士 === 國立交通大學 === 工業工程與管理系 === 91 === Process capability indices (PCIs) can sum up in numbers what the manufacturing process capabilities reveals and have been used to monitor and improve product qualities meeting specifications. First, the existing process capability indices including unilateral, symmetric bilateral, and asymmetric bilateral are reviewed. Additionally, this work describes the existing methodologies assessing process capability for a multi-process product, and addresses the existed methodologies evaluating the integrated process capability for a product family with larger-the-better or larger-the-better specifications. This study includes two parts: (1) study on how to evaluate the integrated process capability of an entire product together with larger-the-better, smaller-the-better, and nominal-the-best specifications, (2) study on how to assess the integrated process capability of a product family with nominal-the-best specifications. The first part of the study aims to propose an integrated process capability index to precisely measure the integrated process capability for a multi-process product. A product capability analysis chart [PCAC] is introduced for practical application. The second part of the study proposes an integrated process capability index to evaluate a product family with nominal-the-best specifications. And the multi-model process capability analysis charts are introduced to compare the process capabilities of family members both for 100% inspections and sampling plans. As a whole, this study is to break the limitations of process capability indices on treat of a product with multi-process characteristics and a product family with nominal-the-best specifications.