Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP16-0045
An Experimental Investigation of Deep-Hole Micro-Drilling of Pure Mg for Biomedical Applications
1Department of Mechanical Engineering, Politecnico di Milano, Italy
2Department of Chemistry, Materials and Chemical Engineering Politecnico di Milano, Italy
3MgShell S.r.l, Milano, Italy
ABSTRACT
The mechanisms of deep-hole micro-drilling of pure Mg material were studied experimentally in order to find a suitable setup for a novel intraocular drug delivery device prototyping. Micro-drilling tests were performed with 0.20 mm and 0.35 mm micro-drills, using a full factorial design in which cutting speed vc and feed fz were made to vary over two levels. Therefore, diameter, burr height and surface roughness of the hole were examined. The results showed that the burr height is not uniform along the circumference of the holes. In particular, the maximum burr height increases with higher cutting speed, due to the thermal effect that plasticizes Mg. Hole entrance diameters are larger than the nominal tool diameters due to tool runout, and their values are higher for high vc and fz. In addition, the roughness of the inner surface of the holes increases as fz increases.
Keywords: Micro-Drilling, Magnesium, Burr, Roughness.
1Department of Mechanical Engineering, Politecnico di Milano, Italy
2Department of Chemistry, Materials and Chemical Engineering Politecnico di Milano, Italy
3MgShell S.r.l, Milano, Italy
ABSTRACT
The mechanisms of deep-hole micro-drilling of pure Mg material were studied experimentally in order to find a suitable setup for a novel intraocular drug delivery device prototyping. Micro-drilling tests were performed with 0.20 mm and 0.35 mm micro-drills, using a full factorial design in which cutting speed vc and feed fz were made to vary over two levels. Therefore, diameter, burr height and surface roughness of the hole were examined. The results showed that the burr height is not uniform along the circumference of the holes. In particular, the maximum burr height increases with higher cutting speed, due to the thermal effect that plasticizes Mg. Hole entrance diameters are larger than the nominal tool diameters due to tool runout, and their values are higher for high vc and fz. In addition, the roughness of the inner surface of the holes increases as fz increases.
Keywords: Micro-Drilling, Magnesium, Burr, Roughness.
