Abstract
This article presents an investigation of the machining response of metallurgically and mechanically modified materials at the micro-scale. Tests were conducted that involved micro-milling slots in coarse-grained Cu99.9E with an average grain size of 30 µm and ultrafine-grained Cu99.9E with an average grain size of 200 nm, produced by equal channel angular pressing. A new method based on atomic force microscope measurements is proposed for assessing the effects of material homogeneity changes on the minimum chip thickness required for a robust micro-cutting process with a minimum surface roughness. The investigation has shown that by refining the material microstructure the minimum chip thickness can be reduced and a high surface finish can be obtained. Also, it was concluded that material homogeneity improvements lead to a reduction in surface roughness and surface defects in micro-cutting.
Original language | English |
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Number of pages | 13 |
Journal | Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture |
Volume | 232 |
Issue number | 7 |
DOIs | |
Publication status | Published - 22 Sept 2016 |
Keywords
- Micro-endmilling
- material microstructure
- grain size effects
- surfcae finish
- surface defects
- equal channel angular pressing
- atomic force microscope
- minimum chip thickness