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Advisor(s)
Abstract(s)
A versatilidade e rigor da maquinagem, fazem deste um dos processos de fabrico mais utilizados na indústria metalomecânica. Com a expansão da utilização de aços inoxidáveis duplex, a maquinagem destes é cada vez mais frequente, contudo, este processo não é fácil. O corte destas ligas é caraterizado por vários mecanismos de desgaste na ferramenta, que trazem impacto negativo na qualidade do trabalho produzido. Ao longo dos anos, tem-se assistido a uma otimização deste processo, assim como ao desenvolvimento de novas ferramentas com revestimentos que melhoram a tribologia do corte e métodos de controlo do desgaste que visam a otimização dos parâmetros. O presente trabalho visa avaliar o comportamento de ferramentas com variação de parâmetros de corte na fresagem deste tipo de ligas. Para tal, foram utilizadas ferramentas de geometria e composição semelhantes, produzidas por empresas distintas. A análise comparativa recaiu sobre a qualidade da superfície gerada por maquinagem, através de perfilometria, registo do desgaste por microscopia eletrónica e análise das forças e binário de corte durante a maquinagem. As experiências realizadas mostram que os parâmetros de corte indicados pelos fabricantes são muito eficazes no equilíbrio entre desgaste, forças de corte e rugosidade. A velocidade de avanço pode ser reduzida, de modo a melhorar a rugosidade, ou aumentada, de modo a otimizar tempos de maquinagem.
The versatility and quality of the machining make this one of the most used manufacturing processes in the metalworking industry. With the expansion in the use of duplex stainless steels, its machining is more and more frequent, however, this process is not easy. The cutting of these alloys is characterized by several tool wear mechanisms whose have a negative impact on the quality of the work produced. Over the years, there has been an optimization of this process, development of new tools, with coatings that improve the cutting tribological features, and wear control methods that look to optimize the parameters. The present work aims to evaluate the behavior of tools with variation in cutting parameters when milling this type of alloys. For this purpose, tools produced by different companies, with similar geometry and composition were used and analysed. Comparative analysis focused on the quality of the surface generated by machining has been made through profilometry, evaluation of the wear by scanning electron microscopy and analysis of cutting forces and torque during machining. The performed work has shown that the cutting data indicated by tool manufacturers are very effective in balancing wear, cutting forces and roughness. Cutting feed can be reduced to improve roughness or increased to optimize machining times.
The versatility and quality of the machining make this one of the most used manufacturing processes in the metalworking industry. With the expansion in the use of duplex stainless steels, its machining is more and more frequent, however, this process is not easy. The cutting of these alloys is characterized by several tool wear mechanisms whose have a negative impact on the quality of the work produced. Over the years, there has been an optimization of this process, development of new tools, with coatings that improve the cutting tribological features, and wear control methods that look to optimize the parameters. The present work aims to evaluate the behavior of tools with variation in cutting parameters when milling this type of alloys. For this purpose, tools produced by different companies, with similar geometry and composition were used and analysed. Comparative analysis focused on the quality of the surface generated by machining has been made through profilometry, evaluation of the wear by scanning electron microscopy and analysis of cutting forces and torque during machining. The performed work has shown that the cutting data indicated by tool manufacturers are very effective in balancing wear, cutting forces and roughness. Cutting feed can be reduced to improve roughness or increased to optimize machining times.
Description
Keywords
Maquinagem Fresagem Aços Inoxidáveis Duplex DSS 2205 Forças de Corte Desgaste de Ferramentas Rugosidade de Superfícies Machining Milling Duplex Stainless Steels Cutting Forces Tool’s Wear Surface Roughness