Machinability of different part materials in micromilling


Mechanical micromachining such as micromilling, microturning and microdrilling has been increasingly required mainly for biotechnological and optical applications. Meanwhile, as machining scale is reduced, tool dimensions, greater precision and repeatability of the machine-tool are demanded. Additionally, part microstructure also affects decisively on micromachining performance since tool feed reaches the same size of the tool edge radius and part material grains. This paper quantifies the influence of cutting direction and part microstructure on workpiece finishing, burr and chip formation when micromilling AISI 1045 steel, VP100 steel and ultrafine-grained aluminum RSA 6061-T6. The milling tests were carried out using the CNC machining centre Kern Evo25 without fluid application. Carbide endmill tools with TiNAl coating, 2 flutes and 1.0 mm diameter from Seco Tools were used. Cutting parameters of 3.0 mm/tooth tool feed, 160 m depth of cut, 60 m/min cutting speed and 1.0 mm cutting width were fixed. The results indicate that the micromilling can be highly an anisotropic process since cutting direction transversal to microstructure minimized the burr formation. Roughness and chip formation depends on grain size of the part material and on their mechanical properties.

RODRIGUES, Alessandro Roger; RAMOS, Luciana Wasnievski da Silva de Luca. Usinabilidadede diferentes materiais da peça no microfresametro. In: CONGRESSO BRASILEIRO DE ENGENHARIA DE FABRICAÇÃO, 8., 2015, Salvador. Anais…. 10 p.

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