Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling
by
Luca Giorleo
Luca Giorleo
Department of Mechanical and Industrial Engineering, University of Brescia, 25136 Brescia, Italy
Micromachines 2019, 10(12), 838; https://doi.org/10.3390/mi10120838
Received: 31 October 2019 / Revised: 26 November 2019 / Accepted: 28 November 2019 / Published: 30 November 2019
(This article belongs to the Section D：Materials and Processing)
A technique to reduce burr height in titanium micro-drilling is presented: a poly (methyl methacrylate) coating was applied before machining on the upper and lower surfaces of a titanium specimen (0.5-mm thick). After drilling, a cleaning process (acetone bath) was executed to eliminate the coating, and holes with less burr were obtained. The coating process was executed with a spin-coating machine. To test the efficacy of the technique, two different coating thicknesses (7.9 and 5.4 μm) and two drill bits (0.25- and 0.5-mm diameter) were evaluated. Qualitative and quantitative analyses of the holes obtained were performed with scanning electron microscopy and three-dimensional microscopy, respectively. The results highlight the efficacy of the technique to reduce the burr height by 70% in coated titanium relative to that in an uncoated titanium sheet.
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Keywords:
micro-drilling; burr reduction method; spin coating
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MDPI and ACS Style
Giorleo, L. Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling. Micromachines 2019, 10, 838.
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