Influence of the lathe rotation and structural parameters in the machinability of an Al-3.0wt% si alloy / Influência da rotação do torno e parâmetros estruturais na usinabilidade de uma liga Al-3%si

Abstract

The metal alloys structures resulting from the solidification process can influence the machinability of these materials, however, few studies have attempted to establish relationships between microstructure and machining properties. This study aimed to verify the influence of lathe rotation and secondary dendritic arm spacing, λ2, on the maximum flank wear (Vbmax) of an Al-3.0wt.%Si alloy solidified in a horizontal directional device under unsteady-state conditions. After the analysis of the results it can be observed that for the same rotation, the variation of Vbmax as a function of λ2 can be expressed through a power-type function, , where “a” and “b” are constants, denoting, therefore, that bigger secondary dendritic arm spacing contributes to greater tool wear. It was also been found that, for the same dendritic arm spacing, higher rotations contribute to greater tool flank wear.