Estudo experimental do microfresamento do aço AISI 316L

• Autor(a) principal: Gomes, Milla Caroline
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/25279; http://dx.doi.org/10.14393/ufu.di.2019.27
• topic: Microusinagem; Microfresamento; Aço Inoxidável; Desgaste; Monitoramento; Micromaching; Micromilling; Stainless Steel; Wear; Monitoring; Engenharia mecânica; Microusinagem; Aço inoxidável; Desgaste mecânico; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::PROCESSOS DE FABRICACAO

The advancement of technologies associated with manufacturing has made it possible to obtain miniaturized components, which are being increasingly used in many areas. The micromilling process stands out in obtaining these components for manufacturing surfaces with high dimensional precision and desirable finish, besides making possible the manufacture of microcomponents with complex geometry in various materials. Considering the importance of micromilling in obtaining the miniaturized components, it is fundamental to carry out investigations on this process. In order to contribute to these investigations, this work has as objectives: analyze the influence of the cutting length of the microtools in the micromilling of the AISI 316L stainless steel and evaluate the vibration and sound signals to monitor the wear condition of the microtools. The influence of the cut length was evaluated from the wear of the microtools, the formation of burrs, the roughness of the machined surface and the calculation of the deflection of the microtools using the Euler Bernoulli beam model. The analysis of the signals was performed in the frequency domain, being possible to identify statistical parameters that differentiate the condition of the new microtool from the worn one. The obtained results showed the wear of the microtools as a function of the machined length is similar to the wear of the tools used in the conventional machining processes. By means of the determination of the Taylor equation it was obtained that for the microtool to have a life of one minute, in the analyzed condition, it must be machined at 30.52 m/min. The top burrs presented larger dimensions. With respect to roughness, it was found that the average roughness (Ra) varied from 0.141 μm to 0.3206 μm for all the cutting conditions used. In the analysis of the deflection of the microtools it was observed that the cutting section was the one that contributed the most to the total deflection of the microtool of greater cut length. Finally, by analyzing the signals, it was possible to differentiate the wear condition of the microtools by means of the vibration and sound signals.