Influência do raio de ponta da ferramenta na rugosidade do ferro fundido nodular

Abstract

Industries in the field of parts manufacturing, automobile, among others that need to machine materials in general, seek to research and find ways to increase their profit, either by increasing revenue or decreasing costs. Cast iron has been a great alternative for cost reduction with repla- cement of raw materials, such as nodular cast iron, which has mechanical properties and good machinability that allows it to be used in parts that were previously made of different steels. In view of this great usability of nodular cast iron, the present work sought to analyze the influence of cutting parameters, mainly the tool nose radius, in the turning process of nodular cast iron, using carbide and ceramic cutting tools. This analysis comes from the need for parts that need low tolerances, that is, a low surface roughness. To verify the performance of the tools, two values of nose radius and chamfer of the cutting tool were used, in addition to two different materials for the tool, ceramic and carbide. The cutting parameters used were rotation (n) of 800 and 1600 rpm, feed (f) of 0.079 mm/rotation, depth of cut (ap) of 0, 5 mm and cutting speed (vc) ranging between approximately 110 and 250 m/min depending on the diameter of the specimen. The results showed that the ceramic had the lowest surface roughness, in addition to the lowest tool wear. The cutting parameters that performed best were high rotation and the smallest tool nose radius.