Análise comparativa da usinagem do aço 4340 utilizando ferramentas de metal duro e ferramentas de cerâmica

• Autor(a) principal: Watanabe, Renato Brandão [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155424; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-05-08/000883032.pdf
• topic: Aço de alta resistência; Usinagem; Ceramica (Tecnologia); Steel, High strength

The machining processes have great importance in the modern world, it is fundamental in reducing costs and increasing life of the materials. Among the materials, the alloys have a consumption of around 1.4 billion tonnes, where a portion of these materials are intended for the manufacture of parts that make up the aerospace industries, aerospace, automotive and others. The objective of this work is the study of machining for steel turning ABNT / AISI 4340, without the use of cutting fluid using alumina ceramic tools (Al2O3) developed in the laboratory and a carbide tool commercially available for comparative analysis. The carbide tool has specified in accordance with ISO TNMG 160.404, while the Al2O3 tool has been rectified and polished in accordance with ISO 1832. The tests were performed on two CNC lathes, the first brand Romi with GL240M power of 18KW and other brand Litz-350-VEKER with power of 15KW. The tests were conducted using cutting speed (Vc) 200, 300 and 500m / min; advances to (f) 0.10, 0.20 and 0.15 mm / rev and depth of cut (ap) to 0.5mm alumina tool and cemented carbide tool with use of cutting fluid Vc = 200m / min, f = 0.2 mm / rev and ap 0.5 mm. The characterizations were carried out according to the flank wear, roughness, hardness and analysis chip using optical microscope Mark Wilson Instruments mod.401 MVD, roughness with roughness of MarSurf M300 model and hardness with microhardness brand Wilson Wolpert 401 model MVD. The results showed that the ceramic tool has potential for 4340 steel machining at high cutting speeds, with a better surface finish on Vc = 500m / min, f = 0.15 mm / rev. The results are promising for use of these tools in machining steel ABNT / AISI 4340, with substantial cost reductions possible