Application of Mahalanobis-Taguchi system and design of experiments to reduce the field failures of splined shafts
International Journal of Quality & Reliability Management
ISSN: 0265-671X
Article publication date: 27 May 2014
Abstract
Purpose
The purpose of this paper is to develop a methodology to reduce the field failures of splined shafts. The paper also demonstrates the application of Mahalanobis-Taguchi system (MTS) for identifying the optimum hardness profile to avoid failures.
Design/methodology/approach
Through the usage profile analysis and comparison between the failed and good shafts, the major reason for shaft failure was identified as hardness variation. Then MTS approach was used to identify the optimum hardness profile for the shafts. An experiment was designed with power, feed and the gap between inductor and quench ring representing the heat transfer rate, heat removal rate and the time between heat transfer and removal of induction hardening process as factors. Based on experimental results, the optimum combination factors that would reduce the variation around the optimum hardness profile were identified.
Findings
The study showed that the shaft failures can be reduced by optimizing the hardness profile of the shafts rather than warning customers on overloading, changing the raw material or investing on machining operation to achieve better shaft finish. The study suggested heat transfer rate, heat removal rate and the time between heat transfer and removal had significant impact on the shaft's hardness profile. The study resulted in reducing the field failures from 0.32 to 0.029 percent.
Practical implications
This study provides valuable information on how to identify optimum hardness profile using MTS methodology to reduce shaft failures and how to minimize the variation around the optimum hardness profile using design of experiments.
Originality/value
To the best of author's knowledge, no study has been conducted to identify optimum hardness profile using MTS methodology. The study also provides an approach to minimize the variation around a non-linear hardness profile using design of experiments.
Keywords
Citation
John, B. (2014), "Application of Mahalanobis-Taguchi system and design of experiments to reduce the field failures of splined shafts", International Journal of Quality & Reliability Management, Vol. 31 No. 6, pp. 681-697. https://doi.org/10.1108/IJQRM-10-2012-0134
Publisher
:Emerald Group Publishing Limited
Copyright © 2014, Emerald Group Publishing Limited