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CNC Milling of Medical-Grade PMMA: Optimization of Material Removal Rate and Surface Roughness

CNC Milling of Medical-Grade PMMA: Optimization of Material Removal Rate and Surface Roughness

Job Maveke Wambua, Fredrick M. Mwema, Buddi Tanya, Tien-Chien Jen
Copyright: © 2022 |Volume: 12 |Issue: 1 |Pages: 15
ISSN: 2156-1680|EISSN: 2156-1672|EISBN13: 9781683182283|DOI: 10.4018/IJMMME.293226
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MLA

Wambua, Job Maveke, et al. "CNC Milling of Medical-Grade PMMA: Optimization of Material Removal Rate and Surface Roughness." IJMMME vol.12, no.1 2022: pp.1-15. http://doi.org/10.4018/IJMMME.293226

APA

Wambua, J. M., Mwema, F. M., Tanya, B., & Jen, T. (2022). CNC Milling of Medical-Grade PMMA: Optimization of Material Removal Rate and Surface Roughness. International Journal of Manufacturing, Materials, and Mechanical Engineering (IJMMME), 12(1), 1-15. http://doi.org/10.4018/IJMMME.293226

Chicago

Wambua, Job Maveke, et al. "CNC Milling of Medical-Grade PMMA: Optimization of Material Removal Rate and Surface Roughness," International Journal of Manufacturing, Materials, and Mechanical Engineering (IJMMME) 12, no.1: 1-15. http://doi.org/10.4018/IJMMME.293226

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Abstract

This study evaluates CNC milling parameters (spindle speed, depth of cut, and feed rate) on medical-grade PMMA. A single objective analysis conducted showed that the optimal material removal rate (MRR) occurs at a spindle speed of 1250 rpm, a depth of cut of 1.2 mm, and a feed rate of 350 mm/min. The ANOVA showed that feed rate is the most significant factor towards the MRR, and spindle speed (11.83%) is the least contributing. The optimal surface roughness (Ra) occurred at spindle speed of 500 rpm, depth of cut of 1.2 mm, and feed rate of 200 mm/min. The milling factors were insignificant. A regression analysis for prediction was also conducted. Further, a multi-objective optimization was conducted using the Grey Relational Analysis. It showed that the best trade-off between the MRR and the Ra could be obtained from a combination of 1250 rpm (spindle speed), 1.2 mm (depth of cut), and 350 mm/min (feed rate). The depth of cut was the largest contributor towards the grey relational grade (54.48%), followed by the feed rate (10.36%), and finally, the spindle speed (4.28%).