Polish-mirror finish surfaces obtained by high precision turning Online publication date: Fri, 13-Feb-2009
by Alexis Gautier, Hatem Khanfir, Philippe Revel, Rene-Yves Fillit
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 4, No. 2/3, 2008
Abstract: Frequently, strict conditions are imposed on dimensions and surface quality of manufactured products. For revolution parts, High Precision Turning (HPT) machine with Single-Crystal Diamond (SCD) tools allows to dispense with successive operations of surface finishing such as grinding and polishing to attain an arithmetic roughness amplitude (Ra) of 6 nm on an aluminium alloy (2017). High part of this roughness amplitude is due to the interaction between diamond tool and precipitates included in the alloy. On pure aluminium Ra drops to 4 nm. To characterise integrity of surfaces machined by a high precision machine, only grazing X-rays can measure structural modifications such as variations of lattice parameter and dislocation density down to 1 µm depth. Moreover, the association of a powerful machine, an autofocus sensor and a SCD tool allows to obtain various and precise/accurate geometric forms with polish-mirror surfaces.
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