Análise das características superficiais da liga Ti-15Mo após torneamento com ferramentas de diferentes geometrias

Abstract

It is consolidated that the machining of titanium alloys poses obstacles due to their low machinability, which is related to the maintenance of mechanical resistance at high temperatures, the low thermal conductivity, the chemical affinity with various tool materials and the low elastic modulus. Due to these difficulties, surface and subsurface problems are recurrent in components of titanium subjected to machining processes, compromising their operation in different applications. Such components are often subjected to severe working conditions and, as a result, require adequate surface integrity parameters for their applications. In order to better understand the influence of tool geometry on the surface integrity of a given titanium alloy and enable the use of different types of tool to increase part quality at the expense of changes in cutting parameters, which affect the productivity of the process, the present work aims to determine correlations between the geometry (clearance angle and nose radius) of uncoated cemented tungsten carbide cutting inserts and the surface characteristics of the Ti-15Mo alloy after turning process. After the tests, according to the results obtained for most of the measured roughness parameters, the small effect of the clearance angle, as well as the significant geometric contribution of the nose radius, whose increase reduced the roughness values, became clear.