ANÁLISE DA USINABILIDADE DA LIGA AL-7%SI SOLIDIFICADA EM UM SISTEMA UNIDIRECIONAL HORIZONTAL

Abstract

Machining is one of the most widely used manufacturing processes, with metals and alloys forming a large percentage of machined materials. During machining, a significant amount of energy is converted into heat, making the cutting temperature a crucial factor. However, few studies assess the influence of the workpiece structure on the cutting temperature. In this context, the relationship between processing, structure, and material properties is critical, as the solidification structure directly affects machinability. This study investigates the influence of thermal parameters and secondary dendritic arm spacing (λ2) of an Al-7wt%Si alloy solidified in a horizontal directional solidification system on cutting temperatures obtained during turning. A significant increase in cutting temperature was observed in all tests, followed by a slight decrease at the end of the process. Furthermore, experimental power function laws relating cutting temperature with cooling rate, solidification rate, and secondary dendrite arm spacing were developed.