Journal of Korean Society of Industrial and Systems Engineering (산업경영시스템학회지)

Society of Korea Industrial and System Engineering (한국산업경영시스템학회)
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Evaluation Method for Measurement System and Process Capability Using Gage R&R and Performance Indices

게이지 R&R과 성능지수를 이용한 측정시스템과 공정능력 평가 방법

  • Ju, Youngdon (Department of Industrial & Systems Engineering, Kongju National University) ;
  • Lee, Dongju (Department of Industrial & Systems Engineering, Kongju National University)
  • 주영돈 (공주대학교 산업시스템공학과) ;
  • 이동주 (공주대학교 산업시스템공학과)
  • Received : 2019.05.27
  • Accepted : 2019.06.20
  • Published : 2019.06.30
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Abstract

High variance observed in the measurement system can cause high process variation that can affect process capability badly. Therefore, measurement system analysis is closely related to process capability analysis. Generally, the evaluation for measurement system and process variance is performed separately in the industry. That is, the measurement system analysis is implemented before process monitoring, process capability and process performance analysis even though these analyses are closely related. This paper presents the effective concurrent evaluation procedure for measurement system analysis and process capability analysis using the table that contains Process Performance (Pp), Gage Repeatability & Reproducibility (%R&R) and Number of Distinct Categories (NDC). Furthermore, the long-term process capability index (Pp), which takes into account both gage variance and process variance, is used instead of the short-term process capability (Cp) considering only process variance. The long-term capability index can reflect well the relationship between the measurement system and process capability. The quality measurement and improvement guidelines by region scale are also described in detail. In conclusion, this research proposes the procedure that can execute the measurement system analysis and process capability analysis at the same time. The proposed procedure can contribute to reduction of the measurement staff's effort and to improvement of accurate evaluation.

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References

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