Abstract:
Industry, particularly aviation, has seen remarkable technological advancement in recent years.
More micro-scale manufacturing capabilities, notably micro-milling capabilities, are required for
high precision machined microparts with complex features in order to obtain the necessary yet
exact dimensional accuracy and surface finish. In this study, the influence of feed rate, cutting
velocity, depth of cut, and four various types of tools with (AlTiN-, TiSiN-, nACo-coatings, and
uncoated) on burr formation, tool wear and surface roughness during micromachining of Inconel
718 was investigated using digital microscope and statistical techniques. On a CNC milling
machine, machining experiments were carried out at high speed with a feed rate below the cuttingedge radius for a 10 mm cutting length with a carbide tool of 0.5 mm diameter. The depth of cut
was shown to be the most important element in burr creation, whereas cutting velocity was found
to be the most important component in surface roughness. Due to the difference in coefficient of
friction, cutting tool coating had no effect on either surface roughness or burr development. The
depth of cut and feed rate influenced the kinds of burr generated during micro-milling of Inconel
718 while cutting velocity had no effect. It was also determined that the surface finish achieved by
high-speed machining is equal to that achieved by transition and low-speed machining and that the
burr width discovered during high-speed machining confirmation trials was likewise within an
acceptable range.
