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.
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