Análise da influência da velocidade de corte na usinagem do aço ABNT 1020 utilizando brocas de aço rápido com e sem revestimento de TiN

Abstract

The advancement of manufacturing processes has allowed the development of machining operations, from the design of machines with computer numerical control (CNC) to the creation of more wear-resistant tools, including the application of surface coatings. These factors allow the use of higher cutting speeds and accelerate the production process. For this reason, this work aims to analyze the influence of cutting speed on the wear of high speed steel twist drills with and without TiN coating and surface finish in the machining of ABNT 1020 steel. The following aspects were analyzed: electric current, temperature of the tools before and after the process, chip shape, average roughness of the holes, dimensional tolerance and microhardness around the holes, in addition to the flank wear of the tools. Through the analysis of the results, it was found that the increase in cutting speed did not contribute to a good surface finish, nor required electric current, chip formation or tool wear. The presence of coating on the tools led to a reduction in average roughness and maximum flank wear, but presented similar results to uncoated tools in other aspects.