Process capability – a surrogate measure of process robustness: a case study
International Journal of Quality & Reliability Management
ISSN: 0265-671X
Article publication date: 31 December 2015
Abstract
Purpose
The purpose of this paper is to obtain a better understanding on robust performance of a hardening and tempering process producing component worm shaft used in the steam power plant. This research is capable to explaining the variation of process capability in terms of robustness.
Design/methodology/approach
This paper proposed a methodology (a combination of simulation, regression modelling and robust design technique) to study robustness of a hardening and tempering process producing component worm shaft used in the steam power plant and process capability acts as a surrogate measure of robustness. In each experimental run, the values of responses and the corresponding multivariate process capability indices across the outer array are determined. The variation of process performance (process capability values) due to random noise variation is studied using a general purpose process control chart (R-chart).
Findings
The results provide useful information in term of insensitiveness of the process against the noise (raw material and process noise) variation where the process capability acts as a surrogate measure of process robustness and explains the variation of process capability in term of robustness.
Practical implications
This paper adds to the body of knowledge on robustness of a manufacturing process. This paper may be of particular interest to practicing engineers as it suggests what factors should be more emphasis to achieve robust (consistent) performance from the process.
Originality/value
The originality of this paper lies within the context in which this study is to address key relationships between process robustness and process capability in a manufacturing industry.
Keywords
Acknowledgements
The author gratefully acknowledges the kind support and cooperation provided by the case study plant. The author is also grateful to the learned reviewers for their comments and suggestions in improving the quality of the paper.
Citation
Mondal, S.C. (2015), "Process capability – a surrogate measure of process robustness: a case study", International Journal of Quality & Reliability Management, Vol. 33 No. 1, pp. 90-106. https://doi.org/10.1108/IJQRM-12-2013-0202
Publisher
:Emerald Group Publishing Limited
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