Análise da qualidade de furos não passantes em liga de alumínio AA 6063-T6 com o uso de fluido de corte a alta pressão.

Abstract

. AA 6063-T6 aluminum alloy is commonly used in various industrial sectors such as civil construction, automobile industry, among others, due to its excellent mechanical properties and corrosion resistance. However, it has a low machinability index in drilling operations due to its ductility, it is characterized by long chips that can lead to drill breakage. The present work aims to analyze the quality of the holes, through the geometric deviations and surface roughness. The drilling process uses a 6.5 mm diameter uncoated polished carbide drill with a cylindrical shank and straight flutes for chip exit and the possibility of applying high pressure internal lubrication and cooling. We propose 2 independent variables with 3 factors, which are: cutting speed (200 and 240 m/min); advance (0.2 and 0.3 mm/rev) and application of cutting fluid at high pressure (35 and 60 Kgf/cm2). The holes were drilled continuously without chip breaking strategy for a length of 18 mm, all tests were replicated. Through ANOVA analysis of variance using interaction graphs to determine if there is a difference between the means of each cutting condition, Pareto graphs were obtained to analyze the effects of the cutting parameters (Vc, f and Pressure) in the machining of non-through holes with better quality in terms of rq roughness, roundness, cylindricity, hole diameter, chip and burr analysis.