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- Title
Capability Analysis for a Multi-Process Product with Bilateral Specifications.
- Authors
Huang, M. L.; Chen, K. S.
- Abstract
Process capability indices (PCI) can be viewed as effective and excellent means of measuring product quality and performance. Several capability indices including Cp,Cpk, and Cpm are well accepted and the implementation of these techniques is successful. The indices Cpu ,Cpl , and Cpk have been used previously for evaluating a multi-process product with smaller-the-better, larger-the-better, and nominal-the-best specifications. For a multi-process product with only the nominal-the-best specifications, the evaluation method should be improved, as index Cpk cannot reasonably reflect the expected process loss. In this paper, index Cpmk is selected to replace Cpk and the application is extended to evaluate simultaneously a multi-process product with both symmetric and asymmetric tolerances. An integrated process capability index for a multi-process product with the nominal-the-best specifications is proposed. The relationship between the process capability index and the process yield is introduced. A multi-process capability analysis chart (MPCAC), reasonably reveals the status of the process capability for the entire product, is constructed for practical application. A case study of a Sea island micro-fiber product is provided as of a practical application.
- Subjects
PRODUCT quality; QUALITY control; INDEXES; TECHNICAL specifications; INDUSTRIAL design
- Publication
International Journal of Advanced Manufacturing Technology, 2003, Vol 21, Issue 10/11, p801
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-002-1396-x