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Material microstructure effects in micro-endmilling of Cu99.9E

Elkaseer, AM and Dimov, SS and Pham, DT and Popov, KP and Olejnik, L and Rosochowski, A (2016) Material microstructure effects in micro-endmilling of Cu99.9E. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 232 (7). pp. 1143-1155. ISSN 2041-2975

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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.