Article2013

Capability performance analysis for processes with multiple characteristics using accuracy and precision

Tsang-Chuan Chang · Kung‐Jeng Wang · Kuen‐Suan Chen

38 citations0/0 files storedProceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture

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Advanced Statistical Process Monitoring Management and Optimization Techniques Management Systems and Quality Improvement

Abstract

Process capability indices have been widely used in the manufacturing industry to provide numerical measures for process potential and process performance. However, from the perspective of improving process quality, there is a significant amount of process information that cannot be conveyed with a single index. Therefore, a single index does not have the ability to represent distinct problems in process performance or to provide the production department with sufficient information to make improvements. Thus, we applied an accuracy index [Formula: see text] and a precision index [Formula: see text] capable of reflecting the degree of deviation from target values and the degree of variance and incorporated the quality-level concept of the six-sigma model to develop a process quality-level analysis chart capable of analyzing the process capabilities of multiple quality characteristics. In addition to being able to directly identify the quality levels for various quality characteristics, the process quality-level analysis chart also provides recommendations for improvement of all quality-level regions to serve as a reference for production departments. Mathematical programming was used to develop a statistical hypothesis testing model to assist production departments in confirming the effectiveness of implemented improvements. This was achieved through derivation of a joint confidence interval for [Formula: see text] and [Formula: see text] from Boole’s inequality. From this, we obtained the upper and lower limits of the [Formula: see text] for [Formula: see text] and [Formula: see text]. Finally, we also applied the proposed approach to a case study of a five-way pipe process.

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References

1986Process Capability Indices 1995Process Capability Indices.1988A New Measure of Process Capability:Cpm 1992Distributional and Inferential Properties of Process Capability Indices 1991The Taguchi Capability Index 2008An overview of theory and practice on process capability indices for quality assurance 1994Brocess capability with asymmetric tolerances 2001Process capability analysis for an entire product

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