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Volume 4 (1996)
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Volume 4, Issue 2
Displaying 1-5 of 5 articles from this issue
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Quadratic Expansion and Adjoint MatricesGenichi Taguchi1996 Volume 4 Issue 2 Pages 2-8
Published: April 01, 1996
Released on J-STAGE: December 24, 2016
JOURNAL FREE ACCESSThe mathematics used for Quality Enginearing is not the one based on statistical mathematics but the one called quadratic expansion.
The degree of freedom is defined as the rank of adjoined matrix of each quadratic term of the expansion. The reason that the writer used the name of degree of freedom is also explaned in this article. Quadratic expansion is related with Hermitian expansion in a complex domain in mathematical form and is related with power spectral expansion from the viewpoint of communication theory.
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Yoshitaka Sugiyama, Kazuhito Takahashi, Hiroshi Yano1996 Volume 4 Issue 2 Pages 28-38
Published: April 01, 1996
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSThe application of on-line quality engineering methods in manufacturing processesis very important since the results directly contribute to the economic gain of a company. However, few case studies have been published. This study discusses the concept of on-line quality engineering concept using the results of collected samples which were taken at certain intervals, followed by the measurement of the samples. This study was conducted with collaboration from several mechanical component parts manufacturing companies. In the study, the following issues were discussed: (1)When a component parts manufactures estimates the functional limit, △0 , and the average loss,A0, in the Loss Function, the results may not reffect the actual situation. lt is important to well understand the concept of the Loss Function such as the functional limit. (2)Sometimes the existing tolerance is looser than the one determined from the functional limit, △0 ,and the average loss, A0, resulting in a wrong tolerance. For this purpose, the standards for the determination of appropriate tolerances are useful. (3)Discussion of appropriate control systems for measurement. (4)How to minimize the total loss due to on-line quality engineering.View full abstractDownload PDF (2687K) -
Shinichi Kazashi, Kenji Kanasashi1996 Volume 4 Issue 2 Pages 39-48
Published: April 01, 1996
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSIn many cases, the strength of material after welding is used to show the quality of spot welding. But this type of evaluation leads to reliance on destructive tests and is difficult to observe the situation after the welding is completed. Therefore, evaluation is made either by using some substitute characteristics or by periodical checks during production. ln this study, a welding process was optimized for the reduction of maintenance costs for a welding process by evaluating the function of the welded parts.View full abstractDownload PDF (2712K) -
Takashi Kamoshita, Takeharu Hirose, Tetsuo Nakamura, Hiroshi Yano1996 Volume 4 Issue 2 Pages 49-57
Published: April 01, 1996
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSIn order to study the calibrating method and the error after calibration for a measuring system, the method to determine the dimensional measuring error of a component part through experimentation was discussed. The procedures of this method followed the guidelines described in JIS Z9090, measurement-General rules for calibration system, a standard established based on the concepts of quality engineering. The calibration was conducted by such new concepts. Up to present, the determination of measurement error has been ambiguous. But from this study, it was concluded that error can be rationally determined by one of the three practical cases of picking up the sources of error. lt is also stated in this paper that quality engineering approaches can be applied to determine the expanded uncertainty which is included in ISO Guide of the Expression of Uncertainty in Measurement.View full abstractDownload PDF (2030K) -
Koji Manabe, Kenji Yao, Shigeo Hoshino, Akio Aoki1996 Volume 4 Issue 2 Pages 58-64
Published: April 01, 1996
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSA power MOSFET has been used as a reliable switching device in automotive electronics. The increasing applications of electronics system in the car requires a lower "ON-resistance", the resistance when the system is in use. Normally, reduction of On-resistance is achieved by miniaturizing the unit. ln this paper, however, On-resistance was minimized through the improvement of the drain electrode process. As a result, the drain contact- resistance was reduce by a factor of eight, showing the potential of miniaturizing the device increasing the functional capacity and reducing manufacturing cost. ln addition, the drain contact-resistance become less sensitive to atmospheric temperature test and thermal cycles. The technology developed in this study can be applied to a wide range of similar devices.View full abstractDownload PDF (1506K)
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