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The milling process is one of the most important machining processes when it comes to the manufacture of molds and dies. The aspects such as high rate of material removal, as well as being a process with great flexibility, grant the milling a great employment in the industry. It's known that the mill's life state has direct effect in the mold's life. The effect of the interrupted cut, the friction between the workpiece and the tool, induce to an increase of the tool's wear. An almost dry condition, such as the application of MQL, has proven to decrease the friction, which leads to an increase of the tool's life. Also, using a coating film helps to increase the tool's life, by providing a higher mechanical resistance. In this context, this work presents a wear analysis of HSS AISI M2 mills coated with titanium nitride (TiN) in the machining with minimal quantity of lubricant (MQL).

The milling is one of the machining processes with greater employment in the today's industry, because of some aspects such as high rate of material removal and production of workpiece with surface and dimensional accuracy, as well as being a process of high flexibility, being used in the manufacture of flat surfaces, contours, slots and cavities, among others. Among the possible variations of the milling process, one of which has increased employment in the sectors of tooling is currently the top milling. The quality of the machined piece surface depends mainly on the geometry of the tool, of the cutting conditions and of the dynamic behavior of the machine tool. Were conducted tests showing a comparison of the integrity of the machined workpiece surface, with high-speed-steel HSS M2 mills, coated with titanium nitride (TiN), in the machining with minimal quantity of lubricant (MQL). The cut parameter varied was the axial depth of cut (ap), where were used 0.4 and 0.8 mm.