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The milling process is one great versatile process and brings severe mechanical and thermal behavior in the cutting region, generating effects under the machined surface part, which can lead to a premature failure. Microhardness variation, heat-affected zone, are examples of many metallurgical changes that may happen due to interaction of the severe behaviors. The effects of each behavior, such as the mechanical, concerning the forces actuating during the chip removal mechanism, or the thermal behavior, which influence the heat generated in the interface between tool/chip/workpiece, can help to understand the effect of the machining parameters. In this context, this study aims to analyze the effect of the machining parameters, ap and ae, on the surface integrity, during the machining of AISI P20 mold steel. For the tests, the cutting section and cutting speed was kept constant, as axial and radial depth parameters changed.

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).