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Desenvolvimento da Tecnologia Friction Stir Channeling com Base Refrigerada
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O Friction Stir Channeling é uma tecnologia inovadora de processamento no estado só-lido. Esta permite a abertura de canais internos e contínuos em componentes monolíticos, numa única passagem. Durante o processo de abertura de canais, por se realizar no estado sólido, dá-se um aquecimento do componente e da ferramenta. Com isto, dependendo da base onde se realiza o processo, pode dar-se a sua perda de estacionariedade, o que leva ao aparecimento de descontinuidades e defeitos nos canais.
Este trabalho pretende contribuir para o desenvolvimento desta tecnologia utilizando uma base de cobre refrigerada para controlar as temperaturas do processo. Foram realizados diversos ensaios com parâmetros diferentes, de modo a avaliar a janela de parâmetros e per-ceber como é que a base afeta os canais produzidos.
Os resultados de cada ensaio foram avaliados e concluiu-se que a base de cobre refri-gerada permite uma taxa de condução de calor significativamente superior, quando compa-rada a uma base de aço, impedindo o componente a processar de aquecer demasiado e que se dê a perda de estacionariedade do processo. Com isto, foi possível a produção de canais numa gama mais alargada de parâmetros.
Friction Stir Channeling is an innovative process within solid-state manufacturing tech-nologies. It allows the production of continuous internal channels in monolithic components, in a single step. While processing, due to it being a solid-state process, the component and the tool warm up. Because of that, the process loses its stationarity, which consequently leads to discontinuities and defects in the channels. This thesis aims at contributing to the development of this technology using a refriger-ated copper backing plate to control the process temperatures. Several tests were carried out with different parameters in order to evaluate the range of process parameters and to under-stand how the backing plate affects the produced channels. The results from each test were evaluated and it was possible to conclude that the re-frigerated copper backing plate allows a remarkably greater rate of heat conduction, when compared to a steel backing plate, preventing the component being processed from overheat-ing and the loss of process stationarity. This way, it was possible to produce channels in a wider range of parameters.
Friction Stir Channeling is an innovative process within solid-state manufacturing tech-nologies. It allows the production of continuous internal channels in monolithic components, in a single step. While processing, due to it being a solid-state process, the component and the tool warm up. Because of that, the process loses its stationarity, which consequently leads to discontinuities and defects in the channels. This thesis aims at contributing to the development of this technology using a refriger-ated copper backing plate to control the process temperatures. Several tests were carried out with different parameters in order to evaluate the range of process parameters and to under-stand how the backing plate affects the produced channels. The results from each test were evaluated and it was possible to conclude that the re-frigerated copper backing plate allows a remarkably greater rate of heat conduction, when compared to a steel backing plate, preventing the component being processed from overheat-ing and the loss of process stationarity. This way, it was possible to produce channels in a wider range of parameters.
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Canais Estado Sólido Temperatura Estacionariedade Refrigeração