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Activity Number: 343
Type: Contributed
Date/Time: Tuesday, July 31, 2007 : 2:00 PM to 3:50 PM
Sponsor: Section on Quality and Productivity
Abstract - #309128
Title: Development of New Capability Indices for Multivariate Manufacturing Processes
Author(s): Jen-Nan Pan and Chun-Yi Lee*+
Companies: National Cheng Kung University and National Cheng Kung University
Address: Department of Statistics, Tainan, , Taiwan
Keywords: multivariate process capability indices ; modified engineering tolerance region ; multivariate manufacturing process
Abstract:

With the advent of modern technology, manufacturing processes become very sophisticated and merely a single quality characteristic cannot reflect the product quality. Normally, the abnormality of an industrial process is caused by the problems of several interrelated quality characteristics. In order to develop realistic multivariate process capability indices for multivariate manufacturing processes, the modified engineering tolerance region considering the correlation among multiple quality characteristics is proposed. The results of our simulation study show that the new NMCp and NMCpm capability indices perform better than the previous multivariate process capability indices, MCp and MCpm, etc. Finally, two numeric examples further demonstrate that the new NMCp and NMCpm indices can correctly reflect the true performance of a multivariate manufacturing process.

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Revised September, 2007