Estudo da influência da geometria da cunha da ferramenta de aço rápido na usinagem do aço ABNT 1045 em diferentes condições lubri-refrigerantes

• Autor(a) principal: Reis, Roberto
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/15003; https://doi.org/10.14393/ufu.di.2015.487
• topic: Geometria da cunha cortante; Teste de faceamento rápido de Brandsma; Condições lubri-refrigerantes; Ferramentas de HSS; Aço ABNT 1045; Usinagem; Fluidos de corte; Ferramentas para cortar metais; Tool wedge geometry; Brandsma rapid facing test; Lubri-cooling conditions; HSS tools; ABNT 1045 steel; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA

Currently companies working with the transformation of raw materials into finished products had to redo their general planning and adequate to a new reality to become competitive. They undergo considerable change in production environments, driven by the dynamic behavior of the market, primarily by customer demand and due to increased competitiveness. Faced with this new scenario, it has become even more necessary to reduce production costs, working whereever possible, since the purchase of raw materials, tools and machinery up to in increasing the efficiency of the manufacturing processes. In this work, two important machining fartores were considered, the geometry of the cutting tool wedge and cutting fluids. The geometry of the cutting wedge, particularly the angles measured in the orthogonal plane (side rake angle, wedge angle and side clearance angle) has a key role for a successful operation, since it determines the resistance of cutting tool wedge and the amount of heat generated by friction between the chip-tool-workpiece system. Although some machining operations occur without a cutting fluid, sometimes it does not need fluid or it hinders the process, sometimes because of environmental and economic issues, the cutting fluid can be vital in certain processes. The lubricant and cooling functions are often crucial to ensure necessary conditions for the cutting tool to perform machining. When the machining occurs with the use of a cutting fluid, it can be applied in the form of jet (flooding) or the formo f a spray, technically called MQF Minimum Quantity of Fluid. The objective of this work is to develop an experimental study to optimize the wedge geometry of high-speed steel - HSS tools, using the Brandsma rapid facing method in ABNT 1045 steel, evaluating the influence of lub-cooling conditions. The output parameter considered was the diameter of collapse of the tool, which determines the critical cutting speed. The results found allowed comparisons between the lub-cooling conditions and check the influence of rake and clearance angles in the in diameter of collapse of the tool. The values of the side rake and side clearance angles of the tool that maximizes the diameter of collapse depend on the lubri-cooling system used. In general, the combination of a side clearance angle of 9° with a side rake angle also of 9° when using flood cooling system (90 l / h) gave the best result. These results are important to contribute to the knowledge of the process, enabling cost savings, because it indicates the best tool wedge geometry and lubri-cooling condition that can be applied for part production in companies / industries.