Análise de defeito em peça de alumínio fundida sob pressão

• Autor(a) principal: Borkovski, Alessandra Maria Cordeiro
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UTFPR (da Universidade Tecnológica Federal do Paraná (RIUT))
• Texto Completo: http://repositorio.utfpr.edu.br/jspui/handle/1/29442
• topic: Fundição sob pressão; Alumínio; Ligas (Metalurgia); Porosidade; Die-casting; Aluminum; Alloys; Porosity; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA

The die casting process is a manufacturing process that allows the series production of parts with good mechanical properties and close dimensional tolerances. The main raw material used in this process is aluminum. Due to its versatility and low density, it has been increasingly used in the automotive industry to manufacture engine component parts. Lightness in vehicle manufacturing minimizes environmental impacts by reducing the use of fossil fuels and emission of polluting gases. In this sense, the SAE 306 alloy, composed of some elements that add enriching properties to aluminum, is widely used in the process under study. Like any manufacturing process, despite the pros, pressure casting has some disadvantages, one of them, intrinsic to the process, is the porosity in the castings. There are countless parameters that can cause such defect in the product, such as the solidification speed and the mold filling time. Currently there are some software, such as MAGMASOFT [trade mark] that can help predict defects in castings, but even so, it is difficult to accurately determine the origin of the porosity. In this work, the behavior of some process parameters with the addition of a new feed channel to the mold was observed. Through simulations developed in MAGMASOFT [trade mark], the possible causes of the appearance of the defect were analyzed, as well as the influence of the alloying elements present in the raw material used. Finally, some critical points were listed that possibly contributed to the high rate of scrap due to leakage of the part. Due to the positive results of the simulations obtained in the software, the project was carried out, and the extra feed channel added to the mold. This event had the consequence of a decrease in the reject index due to porosity of the part under study.