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Navegando EMC - Trabalhos de Conclusão de Curso por curso "Engenharia Mecânica (RMG)"
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Item A inspeção técnica veicular e seu impacto no comércio de veículos usados(Universidade Federal de Goiás, 2023-08-14) Libório, João Pedro Neri; Oliveira, Ademyr Gonçalves de; Oliveira , Ademyr Gonçalves de; Figueiredo, Kleber Mendes de; Franco, André Luiz CarneiroThe present work aims to present the Vehicle Technical Inspection (ITV) alongwith all its technical standards regarding vehicle safety and emission of gases, anddemonstrate how the lack of standardization and regulation by the State leads to aprecarious aging of the Brazilian vehicle fleet, resulting in incalculable damagesdirectly and indirectly to the population. According to the Federal Highway Police, asignificant portion of vehicular accidents occurring in the country today are caused bymechanical defects and lack of maintenance. This explanation illustrates how thistype of accident ends up burdening the Brazilian public healthcare system throughhospitalizations and medical procedures. Additionally, the project also aims toanalyze how the ITV can impact the trade and maintenance of used vehicles in thecountry, highlighting the lack of reliability perceived by a considerable portion of thepopulation, including dealers, intermediaries, mechanical workshops, and the finalcustomer, regarding second-hand automobiles, as it is notorious that a large numberof vehicles with numerous mechanical and structural defects are licensed and solddaily. Lastly, it also seeks to understand and compare how the ITV is practiced inother developed countries, including its standards and obligations, as well as itsperiodic implementation at workstations, in order to explore possible new solutionsand improvements for Brazilian regulations and standards, by adapting successfulexperiences from other global contexts.Item Adequação de uma ferramenta off-line para a programação de um robô manipulador dedicado ao processo de manufatura aditiva por deposição a arco(Universidade Federal de Goiás, 2023-11-08) Matos, Giovana Andrade de; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Fonsceca, João Paulo da Silva; Lopes, Gustavo de CastroThe Wire Arc Additive Manufacturing (WAAM) process has great potential for the manufacture of metallic parts. However, although the procedures are similar to those used in polymer 3D printing, which is already established as an industrial process, WAAM still faces several challenges to become mature enough to be applied on a large scale in industry. One of the ways to carry out the WAAM process is through manipulator robots, which play a significant role in this technique. Deposition trajectories can be generated in two main ways: by "teach" mode or by "Offline" programming. This project adapted a commercial off-line programming tool for the application of the WAAM process through the development of a virtual workstation identical to the one available at the Laboratory of Materials and Manufacturing Processes, programming of the robotic cell using the RoboDK software and the Teach programming mode, and the manufacture of a part with a complex shape (airfoil NACA 04) by the WAAM process.Item Análise de sistemas de ventilação e ar-condicionado utilizando técnicas de Dinâmica dos Fluidos Computacional com software livre(Universidade Federal de Goiás, 2023-08-14) Gratão, Gustavo Gonçalves; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Nascimento, Andreia Aoyagui; Vilela, Carlos Alberto de AlmeidaIn this work, the importance of indoor air quality for people's health was emphasized, highlighting the relevance of an adequately ventilated and air-conditioned environment for the well-being and comfort of occupants. Analyzes of different ventilation and air-conditioning systems were carried out using computational fluid dynamics techniques with free, open source and free software. Simulations of internal air flows in an enclosure were conducted using OpenFoam, while the data obtained were processed using Paraview. The computational experiments results were promising, with the model employed providing satisfactory results. These results demonstrate the potential application of the methods used in other analyzes and provide valuable information for the optimization of ventilation and air conditioning systems in different environments.Item Avaliação de parâmetros e utilização do tempo de parada na qualidade construtiva de uma peça de alumínio fabricada por manufatura aditiva por deposição a arco(2023-08-14) Silva, Felipe Cardoso Tavares; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Rodrigues, Thales Marcelo Pereira; Kihara, Eliane Alves; Souza, DanielAn aspect of the Additive Manufacturing (AM) manufacturing process that has been widespread in the Biomedical, Automobile and Aerospace industries is the Wire Arc Additive Manufacturing (WAAM). WAAM consists in the manufacture of metallic components from the deposition of multilayers of weld beads on a substrate, that is, from a three-dimensional model, the object is divided into layers, defining the trajectory in which the addition of metal, performing it by means of a robotic manipulator. The AM has advantages when compared to other manufacturing processes, such as conventional machining, such as a high deposition rate, less material waste, and the possibility of manufacturing complex parts of large proportions. However, it has been facing some challenges to become sufficiently mature and to be applied on a large scale in the industry, thus demanding a series of studies and research for its consolidation and maturation. The objective of this work was to contribute to this maturation through the evaluation of the influence of the parameters used in the manufacture by the WAAM process of an aluminum part with a relatively complex profile and the evaluation of the influence of the use of stop between layers in the manufacture of this part. For this, a pulsed GMAW (Gas Metal Arc Welding) welding system was used coupled to a Yaskawa Motoman HP20D-A80 robotic manipulator, with ER4043 aluminum wires of 1.2 mm in diameter. After programming the trajectories, preliminary tests were carried out in the format of an airfoil, having as standardized parameters the Contact Tip to Work Distance (CTWD) in 18 mm and the rise GAP in 0.5 mm and as varied parameters the deposition velocity (cm/min), the welding current in synergic mode (A) and the pure argon gas flow rate (L/min). Next, two airfoils were manufactured with 100 layers each, the first without stopping and the second with a 30-second stop between each layer, to perform a dimensional analysis and compare the time spent in the manufacture, height, thickness, porosity, and surface finish.Item Avaliação do efeito da trajetória na fabricação de roldana de FeCrC-Nb pelo processo de manufatura aditiva por deposição a arco(Universidade Federal de Goiás, 2023-09-15) Carvalho, Lúcio Mateus Santana; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Alves, Renata Rodrigues; Marques, Vitória Ferreira de OliveiraThe welding process with flux cored wire (FCAW), using FeCrC+Nb alloy, made it possible to produce high hardness parts. This project evaluated the use of different weld patterms to analyze hardness values in different areas of the part, along the bead and weld layers. Two sheaves were made by different welding patterns, weaving and concentric circles (CC). The presence of the primary carbides M7C3 and NbC was found to affect hardness. The weaving pattern presented higher hardness than the CC pattern, which is justified by the strong presence of hard carbides.Item Estudo do uso da escória ferro-níquel no processo de soldagem utilizando o processo MIG/MAG adaptado para arco submerso(Universidade Federal de Goiás, 2023-08-16) Machado, Yago de Moraes; Figueiredo, Kléber Mendes de; Figueiredo, Kléber Mendes de; Alves, Renata Rodrigues; Alves, Fleide Wilian Rodrigues; Ferreira Filho, DemostenesThis study aimed to investigate the feasibility of utilizing ferro-nickel slag as a flux for submerged arc welding by incorporating carbon into its composition to enhance the hardness of the weld bead. The experimental process was conducted in collaboration with Anglo American, a mining company, which provided the slag for research purposes. The initial phase involved the adaptation of the MIG/MAG welding machine for submerged arc welding. This adaptation included the development of a 3D-printed support for the welding torch and a flux feeder. Subsequently, the welding parameters were systematically tested and adjusted, resulting in the production of a uniform weld bead. Subsequently, hardness and metallography tests were performed on various samples of weld beads on steel plates. A sample was used with pure CO 2 in the MIG/MAG process to serve as a reference for comparison with the submerged arc welding process results. In the submerged arc samples, experiments were conducted both with and without the removal of the mill scale. Additionally, an experiment was conducted with 1% carbon in the flux composition to explore the potential of increasing the coating hardness during the welding process. The metallography results exhibited promising outcomes with minimal fluctuations in hardness values.Item Influência da rugosidade superficial na molhabilidade de cordões de solda(Universidade Federal de Goiás, 2023-08-10) Mateus, Lucca Castro Gonçalves de; Ferreira Filho, Demostenes; Souza, Daniel; Alves, Renata Rodrigues; Marques, Vitória Ferreira de Oliveira; Souza , DanielWettability in weld beads is related to the convexity of the bead and the contact angle with the base material surface. This is an important parameter for weld quality since beads with high convexity can create stress concentrators in parts subjected to cyclic stresses and lack of fill in coating operations. Therefore, the objective of this study is to evaluate whether the surface finish of the base material will influence the wettability of weld beads on carbon steel sheet using the MIG/MAG process. The method used involved generating different levels of roughness through machining processes. The roughness was then measured, and weld beads were performed on each of the surfaces. Welding tests were conducted using two shielding gases to verify if the same behavior would be observed for each of them. The criterion used was the measurement of the contact angle of the bead edges from cross-sectional cuts analyzed by macrographs. The results showed that it was not possible to observe a noticeable change in the contact angle as a function of roughness using the method employed, which proved to be limited for the proposed objective