Journal of Quality Engineering Society
Online ISSN : 2189-9320
Print ISSN : 2189-633X
ISSN-L : 2189-633X
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Volume 30, Issue 1
Displaying 1-8 of 8 articles from this issue
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  • A Study of Electric Power Evaluation of a Boring Process by Use of Interval Analysis
    Nobuyuki Gomi, Yasuhiro Takarayama, Hiroshi Yano
    2022 Volume 30 Issue 1 Pages 38-46
    Published: January 01, 2022
    Released on J-STAGE: August 14, 2023
    DOIhttps://doi.org/10.18890/qes.30.1_38
    JOURNAL FREE ACCESS
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    The application of interval analysis to parameter design for a boring process evaluated by use of electric power data is proposed. The purpose is to use interval analysis to obtain different findings. In contrast to the factor effects previously used in the analysis of electric power evaluation, the factor effects obtained by analysis during the boring process, at the start of the boring process, and at the end of the boring process were compared. As a result it became possible to analyze the variance over different intervals, and express the evaluation of the boring process in more detail according to the stage of the boring operation.
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  • Optimization of Printing Conditions in a 3D Printer by Parameter Design using Transferability
    Makoto Nakahara, Naomasa Ishii, Nobuyuki Gomi
    2022 Volume 30 Issue 1 Pages 47-53
    Published: January 01, 2022
    Released on J-STAGE: August 14, 2023
    DOIhttps://doi.org/10.18890/qes.30.1_47
    JOURNAL FREE ACCESS
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    This study was carried out to propose and optimize a method of evaluating a 3D printer used in an educational institution. It was proposed that the S/N ratio of transferability would be an effective evaluation technique. As an experiment, the parameter design method used in quality engineering was applied to a nominal-is-best characteristic, specifically, the ratio of product dimensions to drawing dimensions, using the Taguchi-Mahalanobis system with a single unit space. The possibility of obtaining more practical conditions by further optimization was confirmed.
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  • Functionality Evaluation and Virtual Parameter Design in Die Maintenance Welding
    Yasuhiro Takarayama
    2022 Volume 30 Issue 1 Pages 54-61
    Published: January 01, 2022
    Released on J-STAGE: August 14, 2023
    DOIhttps://doi.org/10.18890/qes.30.1_54
    JOURNAL FREE ACCESS
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    This case study presents an example of virtual design in relation to overlay welding for maintenance of a diecasting mold. Two departments were involved in the overlay welding process. Virtual design was used to evaluate the understanding of the welding conditions by the workers in both departments. This led to the isolation of factors with a major effect on overlay welding, but the two departments took diametrically opposite views of the effect of one of the factors. Test pieces that both departments thought would be affected by this factor were made by the two departments and evaluated in terms of electric power consumption during the welding process. Quality of the test pieces was also evaluated by a tension test. The results indicated which factor level was superior, and were shown to both departments. Evaluation by virtual design and functional testing thus led to a better understanding of the welding skills in the two departments.
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