Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
Volume 232, Issue 7, Pages 1143-1155Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954405416666898
Keywords
Micro-endmilling; material microstructure; grain size effects; surface finish; surface defects; equal channel angular pressing; atomic force microscope; minimum chip thickness
Funding
- FP7 NMP program 'High Performance Production Line for Small Series Metal Parts' (HYPROLINE) [314685]
- FP7 NMP program 'High throughput integrated technologies for multi-material functional Micro Components' (HINMICO) [609110]
- EC [608843]
- EPSRC [EP/G03477X/1] Funding Source: UKRI
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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 mu m and ultrafine-grained Cu99.9E with an average grain size of 200nm, 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.
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