A carregar...
Publicação
Hot-Forging WAAM de Aço de Baixa Liga
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.54 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
Os processos de fabrico aditivo têm um lugar cada vez mais importante na indústria atual uma vez que dão resposta às necessidades impostas pela mesma. Na área dos metais esta tecnologia tem por designação Wire Arc Addictive Manufacturing (WAAM), para processos com matéria prima na forma de fio e arco elétrico como fonte de energia, depositando seletivamente camadas para formar as geometrias desejadas. O Hot-Forging WAAM (HF-WAAM) é uma variante do processo WAAM que visa forjar a elevadas temperaturas o material dos componentes produzidos assim que este é depositado, melhorando as propriedades do mesmo. Tal acontece devido à ação de um martelo oscilante que induz, através de movimentos lineares verticais, deformação plástica.
O estudo efetuado nesta dissertação teve como objetivo verificar os efeitos que o HF-WAAM tem nas propriedades estruturais e mecânicas dos espécimes produzidos em aço de baixa liga, recorrendo a esta variante do WAAM.
Na sequência do mesmo estudo foram produzidos espécimes de diferentes dimensões e parâmetros, foram analisadas as alterações quer morfológicas quer estruturais que as variáveis em estudo induzem, tendo em vista a verificação da sua influência no comportamento mecânico do material.
Concluiu-se que existe uma melhoria evidente de propriedades estruturais dos espécimes produzidos por HF-WAAM face aos produzidos via WAAM convencional, observou-se a influencia dos parâmetros de processo nestas tecnologias de fabrico, assim como se verificou uma menor sensibilidade a erros de parametrização no processo HF-WAAM comparativamente ao WAAM.
The addictive manufacturing processes have established its place in the current industry since it presents answers to said industry needs. In the metallic field this technology is called Wire Arc Addictive Manufacturing (WAAM), to processes that use raw material in the wire form and an electric arc as the heat source, being that this is transformed in ways that it could be deposited selectively in order to form the desired geometries. The Hot-forging WAAM (HF-WAAM) is a variant to the WAAM process that intents to forge the material at high temperatures as soon as the material is deposited, improving its properties. Just like what happens with an oscillating hammer, with linear vertical movement, causing plastic deformation. The study had as the major focus to verify the effects of the HF-WAAM in the structural and mechanical properties of the specimens produced with this WAAM variant. In the sequence of the same study, there were manufactured different size and parameters specimens and it was analyzed the alterations, thus being morphological and structural observed in the study variables, in order to verify its influence in the mechanic behavior of the material. As the main inferences of this essay, it is pointed the improvement of the specimens’ structural properties manufactured by HF-WAAM. It was also observed the influence of the process parameters in this manufacturing technologies, thus we can elicit the evident smaller sensibility to parameters changes in the HF-WAAM process.
The addictive manufacturing processes have established its place in the current industry since it presents answers to said industry needs. In the metallic field this technology is called Wire Arc Addictive Manufacturing (WAAM), to processes that use raw material in the wire form and an electric arc as the heat source, being that this is transformed in ways that it could be deposited selectively in order to form the desired geometries. The Hot-forging WAAM (HF-WAAM) is a variant to the WAAM process that intents to forge the material at high temperatures as soon as the material is deposited, improving its properties. Just like what happens with an oscillating hammer, with linear vertical movement, causing plastic deformation. The study had as the major focus to verify the effects of the HF-WAAM in the structural and mechanical properties of the specimens produced with this WAAM variant. In the sequence of the same study, there were manufactured different size and parameters specimens and it was analyzed the alterations, thus being morphological and structural observed in the study variables, in order to verify its influence in the mechanic behavior of the material. As the main inferences of this essay, it is pointed the improvement of the specimens’ structural properties manufactured by HF-WAAM. It was also observed the influence of the process parameters in this manufacturing technologies, thus we can elicit the evident smaller sensibility to parameters changes in the HF-WAAM process.
Descrição
Palavras-chave
Fabrico Aditivo WAAM HF-WAAM Aço de Baixa Liga Ensaios de Tração