Influências do revestimento no desgaste da ferramenta no processo hobbing

Abstract

The high demand of the industries, together with the need for high efficiency, promotes technological advances in the area of machining. Machining tool coverings come to meet this need, increasing the durability, and reliability of the tools. This work analyzed the effect of three different machining tool coatings (TiN, TiAlN and CrAlN) on the wear of the tool in the process of generating gears by hobbing. For this, experimental tests were performed using a single hob tool, which after undergoing a sharpening process received the different coatings. The tests consisted in measuring the maximum flank wear (Vbmax) of the tool after machining a test piece of a total of five, these specimens underwent thermal treatment of austenitization in order to accelerate wear. In addition, the texture and roughness of the specimens were analyzed at different stages of tool life. The results indicated that the TiAlN coating had the lowest wear values, statistically equal to CrAlN, and higher than TiN. The CrAlN presented the lowest values of roughness, and together with the TiAlN were the ones that presented greater stability for this greatness. In addition, the TiAlN and CrAlN in an economic comparison were the lower cost per machined test specimen.