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    Volume 50, Issue 1 (May 2021)

    Statistical Test of Two Taguchi Six-Sigma Quality Indices to Select the Supplier with Optimal Processing Quality

    (Received 9 January 2021; accepted 8 March 2021)

    Published Online: 14 May 2021

    CODEN: JTEVAB

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    Abstract

    Because of rapid changes in consumer needs, diverse and small-batch production has become a crucial strategy for companies progressing toward sustainability in intensely competitive industries. To swiftly meet the diverse needs of consumers using this production strategy, often manufacturers must outsource noncore processes to external contractors or purchase component parts from suppliers. The objective of this article was to develop a supplier selection model based on the processing quality of suppliers. Owing to the fact that the Taguchi Six-Sigma quality index for process with nominal-the-best specification (Qpm) can fully reflect product loss and the achieved quality level for the quality characteristic of the process in question, Qpm is employed as a tool to assess and compare the processing quality level of two-sided specification limits provided by each supplier. In practice, Qpm is based on the sample data collected from a stable process to estimate prior to the processing quality assessment. This can lead to misjudgment because of sampling error. To increase the reliability of supplier selection, we further propose hypothesis testing of the quality index Qpm for two suppliers. The applicability and effectiveness of the proposed model is validated using an example involving the double-sided grinding process of a bicycle disc brake.

    Author Information:

    Chang, Tsang-Chuan
    Department of Business Management, College of Intelligence, National Taichung University of Science and Technology, Taichung, Taiwan

    Chen, Kuen-Suan
    Department of Industrial Engineering and Management, National Chin-Yi University of TechnologyDepartment of Business Administration, Chaoyang University of Technology, TaichungTaichung, TaiwanTaiwan


    Stock #: JTE20210016

    ISSN:0090-3973

    DOI: 10.1520/JTE20210016

    Author
    Title Statistical Test of Two Taguchi Six-Sigma Quality Indices to Select the Supplier with Optimal Processing Quality
    Symposium ,
    Committee E11