Process Capability Analysis for Simple Linear Profiles in Two-stage Process

Document Type : Research Paper

Authors

1 PhD student of Industrial Engineering, Department of Industries, Faculty of Industrial Engineering, University of Science and Technology, Tehran, Iran

2 Professor of Industries Department, Faculty of Industrial Engineering, University of Science and Technology, Tehran, Iran

Abstract

When a process is statistically in-control, one may be interested in assessing the process performance based on the process capability analysis. Although an extensive literature exists on process capability analysis when quality characteristic of interest is continuous or discrete but the existing methods are not applicable to the case when a process or product is represented by a linear profile. A profile is a relationship between a response variable and one or more independent variables. Manufacturing operations are often involved with multistage processes, in which the output of a stage is the input of its subsequent stage. This property is known as the cascade property. Using common indices to assess the capability may lead to incorrect results as the cascade effect is ignored. This study presents a method to conduct process capability analysis in a two-stage process when quality of a product or process can be characterized by a simple linear profile. A numerical simulation evaluates the performance of the proposed method for a two-stage process. The results indicate effective performance of the proposed method.

Keywords

References

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Journal of Industrial Engineering Research in Production Systems
Volume 10, Issue 20
January 0
Pages 183-191

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