Abstract:
The objective of this research was to propose a methodology for designing and
developing a vehicle shock absorber by integrating the design for Six Sigma and quality standard
ISO/TS 16949. The research began with studying the current product design processes of the case
study company. In step 2, the methodology for designing and developing the product was
developed employing the DMADV process of the design for Six Sigma and quality standard
requirement of ISO/TS 16949. In step 3, the application of the methodology to the vehicle shock
absorber was performed including Advanced Product Quality Planning (APQP), Design Failure
Mode and Effects Analysis (DFMEA), Prototype control plan, Measurement System Analysis
(MSA), Statistical Process Control (SPC), and Production Part Approval Process (PPAP). Result
of this study showed that the methodology enhanced the robustness of the product design process.
From the MSA analysis including equipment variation (EV), appraiser variation (AV),
repeatability and reproducibility (GRR) for the testing equipment, the variation was lower than
10%. For the attribute measurement system, the kappa statistic was 0.97 with 95% effectiveness
which was which was acceptable for the measurement system. For the process capability and
performance, Cpkและ Ppk were upper 2 which indicated that the design process for vehicle shock
absorber was within six sigma level.