Control Charts for One-sided Capability Indices

Control Charts for One-sided Capability Indices There are many industrial product characteristics are desired to be the bigger the best and the smaller the best. The two well-know processes capability indices C pl and C pu, which measure larger-the-better and smaller-the-better process capabilities. Obviously, the formulae for the two indices C pl and C pu are easy to understand and straightforward to apply. Thus, indices C pl and C pu have been utilized by a number of Japanese companies and the U.S. automotive industry by Ford Motor Company. Boyles (1991, Journal of Quality Technology. 23: 17–26) and Spring (1995, Total Quality Management 6(3): 427–438.) point out that as soon as $$\overline{X}$$ and S control charts are in statistical control, the control charts of process capability indices can be used to monitor the quality of process. In the previous, we know that if the process is not in control, the process capability index control chart can be used to monitor the differences of process capability, and as soon as the process is in control the stable process capability can be identified. Therefore, process capability index control chart not only can be used to monitor the stability of process’s quality but also can be used to monitor the quality of process. Since Boyles (1991, Journal of Quality Technology 23: 17–26.) and Spiring (1995, Total Quality Management 6(1): 21–33.) had had research about control chart of the bilateral specification index C pm., but there are many kinds of products, which meet unilateral quality specification. Therefore, we will construct the control chart of unilateral specification index C pl and C pu to monitor and evaluate the stability of process and process capability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quality & Quantity Springer Journals

Control Charts for One-sided Capability Indices

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2006 by Springer Science+Business Media, Inc
Subject
Social Sciences; Methodology of the Social Sciences; Social Sciences, general
ISSN
0033-5177
eISSN
1573-7845
D.O.I.
10.1007/s11135-006-9013-y
Publisher site
See Article on Publisher Site

Abstract

There are many industrial product characteristics are desired to be the bigger the best and the smaller the best. The two well-know processes capability indices C pl and C pu, which measure larger-the-better and smaller-the-better process capabilities. Obviously, the formulae for the two indices C pl and C pu are easy to understand and straightforward to apply. Thus, indices C pl and C pu have been utilized by a number of Japanese companies and the U.S. automotive industry by Ford Motor Company. Boyles (1991, Journal of Quality Technology. 23: 17–26) and Spring (1995, Total Quality Management 6(3): 427–438.) point out that as soon as $$\overline{X}$$ and S control charts are in statistical control, the control charts of process capability indices can be used to monitor the quality of process. In the previous, we know that if the process is not in control, the process capability index control chart can be used to monitor the differences of process capability, and as soon as the process is in control the stable process capability can be identified. Therefore, process capability index control chart not only can be used to monitor the stability of process’s quality but also can be used to monitor the quality of process. Since Boyles (1991, Journal of Quality Technology 23: 17–26.) and Spiring (1995, Total Quality Management 6(1): 21–33.) had had research about control chart of the bilateral specification index C pm., but there are many kinds of products, which meet unilateral quality specification. Therefore, we will construct the control chart of unilateral specification index C pl and C pu to monitor and evaluate the stability of process and process capability.

Journal

Quality & QuantitySpringer Journals

Published: May 25, 2006

References

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