Measuring PPM Non‐conformities for Processes with Asymmetric Tolerances. (16th May 2012)

• Record Type: Journal Article
• Authors: Pearn, W. L.; Wu, C. H.
• Is Part Of: Quality and reliability engineering international. Volume 29:Number 3(2013:Apr.)
• Page Start: 431
• Page End: 435
• Publication Date: 2012-05-16
• Subjects: Reliability (Engineering) -- Periodicals; Quality control -- Periodicals; High technology -- Periodicals; 620.00452
• DOI: 10.1002/qre.1401
• Languages: English
• ISSNs: 0748-8017

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Process yield has been the most basic and common criterion used in the manufacturing industry for evaluating process capability. The <italic>C</italic>_{<italic>pk</italic>} index has been used widely in the manufacturing industry. In this note, we considered a generalization of <italic>C</italic>_{<italic>pk</italic>} index which handles processes involving a target <italic>T</italic> with asymmetric tolerances. Particularly, we established a formula for measuring the PPM non‐conformities for given ratios of the two‐side tolerances. We proved the validity of the established formula and tabulated the upper bounds on PPM non‐conformities for various given <italic>C</italic>_{<italic>pk</italic>} index values and ratios of the two‐side tolerances. Copyright © 2012 John Wiley &amp; Sons, Ltd.</p> </abstract>