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Desenvolvimento da variante de processo: µ - WAAM
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Atualmente, o fabrico aditivo é alvo de grande interesse por parte da
indústria. O Wire and Arc Additive Manufacturing (WAAM) é uma variante do
fabrico aditivo de metais que se destaca pela elevada taxa de deposição.
Contudo apresenta desvantagens, como o fraco rigor dimensional e geométrico,
motivando desta forma o estudo de uma nova abordagem de WAAM para a
produção de peças de reduzidas dimensões.
No âmbito deste trabalho para reduzir a taxa de deposição e,
consequentemente, melhorar a precisão dimensional, foi desenvolvida a variante
µ - WAAM na qual foi reduzido o diâmetro do fio de alimentação.
Foi desenvolvido um protótipo funcional e otimizados os parâmetros de
processo para diferentes metais. Utilizando fio de alimentação com diâmetro
entre 200 – 300 µm foram produzidos provetes em forma de parede. Estes foram
posteriormente caracterizados geometricamente.
Os resultados obtidos comprovam a viabilidade da tecnologia
desenvolvida, constituindo um bom ponto de partida para trabalhos futuros. Foi
possível compreender a influência dos parâmetros de processo no
estabelecimento do arco e na geometria do cordão. Produziram-se paredes
consolidadas, no entanto, mesmo aquecendo o substrato, surgiram dificuldades
em garantir a adesão entre camadas.
Additive manufacturing is nowadays the target of great industry attention. The Wire and Arc Additive Manufacturing (WAAM) process is an additive manufacturing variant with metal that is highlighted by its high deposition rate. However, it has some disadvantages when it comes to its dimensional and geometrical precision and accuracy. Thus, motivating the study of a new approach to WAAM to produce small parts. In the scope of developing the work already done, a new variant has been developed, named µ - WAAM, in which the diameter of the feeding wire has been decreased to lower the deposition rate and consequently, to improve the dimensional accuracy. A functional prototype was developed, and the process parameters were optimized for different metals. A series of linear samples were built using a feeding wire with a diameter comprised between 200 – 300 µm. These samples were later geometrically characterized. The results obtained show the feasibility of the newly developed technology, establishing a good starting point for future work. It was possible to comprehend the influence of the process parameters in the geometry of the sample. Multi layered walls were built, however, even when the substrate was heated, the lack of adhesion between layers was noticeable.
Additive manufacturing is nowadays the target of great industry attention. The Wire and Arc Additive Manufacturing (WAAM) process is an additive manufacturing variant with metal that is highlighted by its high deposition rate. However, it has some disadvantages when it comes to its dimensional and geometrical precision and accuracy. Thus, motivating the study of a new approach to WAAM to produce small parts. In the scope of developing the work already done, a new variant has been developed, named µ - WAAM, in which the diameter of the feeding wire has been decreased to lower the deposition rate and consequently, to improve the dimensional accuracy. A functional prototype was developed, and the process parameters were optimized for different metals. A series of linear samples were built using a feeding wire with a diameter comprised between 200 – 300 µm. These samples were later geometrically characterized. The results obtained show the feasibility of the newly developed technology, establishing a good starting point for future work. It was possible to comprehend the influence of the process parameters in the geometry of the sample. Multi layered walls were built, however, even when the substrate was heated, the lack of adhesion between layers was noticeable.
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Palavras-chave
Fabrico aditivo Fabrico aditivo de metais Fabrico aditivo por arco elétrico Micro fabrico aditivo Micro fabrico aditivo por arco elétrico