Parametric Selection and Optimization for the Drilling Of AZ91 Magnesium Alloys Using the Taguchi Method Incorporating Direct and Aspect Parametric Ratios
doi: 10.14456/mijet.2023.4
Keywords:
Aspect ratios, drilling, magnesium AZ91 alloy, optimisation, response tableAbstract
The central pursuit in drilling optimisation is to reduce, control and monitor the diverse process-oriented defects. However, in the drilling of AZ91 magnesium alloy, the optimisation approach adopted using the Taguchi technique still lacks complete capture of relevant data for the effective hole creation defect minimization. At present, the aspect ratios are completely ignored in the determination of optimal parametric settings using the factor-level response table evaluation route. This paper overcomes this shortcoming by introducing some aspect ratios into the computational framework of optimisation using the Taguchi method. Literature data regarding the drilling of AZ91 magnesium alloy was used to validate the proposed optimisation approach. The approach consists of defining the factor-level table to incorporate aspect ratio factors. Then, the orthogonal matrix, signal-to-noise ratios and the summarized signal-to-noise ratio (response) table are then declared. With the direct parameters of speed and feed considered in the literature sources for validating the method, aspect ratios were formulated to involve the ratios of speed to feed and vice-versa. Others are the square and reciprocals of speed and feed parameters. A total of eight alternatives were formulated and tested with each alternative consisting of the squares reciprocals or aspect ratios of the speed and feed parameters. Results showed that 41.67% of all the tested parameters significantly impact surface roughness during the drilling operation. These are the square and cube of feed rate, the reciprocals of the square and cube of speed and the ratio of the feed rate to speed. It is concluded that the study provides a useful route to analyzing the optimisation and performance potential of the drilling process for cost-effective drilling activities.
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