Reconsidering Control Charts in Japan

Ken Nishina (), Kazuyoshi Kuzuya () and Naru Ishii ()
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Ken Nishina: Nagoya Institute of Technology, Department of Techno-Business Administration
Kazuyoshi Kuzuya: SQC Consultant
Naru Ishii: Nagoya Institute of Technology, Department of Techno-Business Administration

A chapter in Frontiers in Statistical Quality Control 8, 2006, pp 136-150 from Springer

Abstract: Summary In this paper, the role of control charts is investigated by considering the practice of using Shewhart control charts from the following viewpoints: 1) Which rules should be used for detecting an assignable cause? 2) What should be considered as chance cause? 3) What should be selected as control characteristics? Woodall (2000) indicated that it is very important to distinguish between the use of control charts in Phase 1 and Phase 2. Considering the different aims of control charts in Phase 1 and Phase 2, we suggest how to use a set of eight pattern tests specified in ISO 8258: Shewhart control charts The improved machine performance by advanced production engineering results in a reduction of variability within a sub-group and a relatively high process capability. Despite, there are frequently alarms when using Shewhart control charts and this is one of the reason why control charts are not used in Japanese industry. For decreasing the false alarm rate, we propose to include a part of the variability between sub-groups into the variability due to chance causes. The complexity of quality characteristics to be assured has grown with the complexity of products. On the other hand, the advances in measurement technology enable to monitor almost every characteristics. Based on a case study we show that the characteristic to be assured must not necessarily be similar to the characteristic to be monitored.

Keywords: Control Chart; False Alarm Rate; Process Capability; Process Capability Index; Cusum Chart (search for similar items in EconPapers)
Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-7908-1687-7_8

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DOI: 10.1007/3-7908-1687-6_8

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