A carregar...
Publicação
Projeto de gabaritos produzidos por FDM para o controlo dimensional e de resistência mecânica de peças injetadas
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 15.39 MB | Adobe PDF |
Orientador(es)
Resumo(s)
A presente dissertação aborda o desenvolvimento de gabaritos e sistemas de fixação fabricados
por impressão 3D, com recurso ao processo Fused Deposition Modeling para posterior aplicação
em ensaios mecânicos, nomeadamente ensaios de tração e compressão e para controlo
dimensional de peças poliméricas injetadas. A crescente utilização de materiais poliméricos na
indústria e na necessidade de soluções ágeis e adaptáveis, económicas e personalizadas
justificam a investigação de métodos alternativos de fabrico de dispositivos de suporte
metrológico e acessórios para equipamentos de ensaios mecânicos.
A metodologia baseou-se, em primeiro lugar, na pesquisa de conceitos teóricos para auxiliar
todo o projeto, na conceção de modelos de Computer Aided Design, no fabrico dos mesmos
modelos com um equipamento da Prusa e posterior avaliação de resultados de alguns gabaritos
que diferiram na conceção geométrica, no tipo de preenchimento, na densidade de
preenchimento e nos materiais utilizados. Esta avalização foi realizada através da aplicação
direta dos gabaritos no equipamento de tração com as respetivas peças a ensaiar para o
primeiro caso e para o segundo caso através de medição de peças a controlar com recurso a
uma máquina de medição por coordenadas e posterior comparação de resultados com os
métodos já implementados. Foram ainda impressos provetes para realização de ensaios para
caracterização mecânica e tentativa de estabelecer uma relação matemática entre o aumento
da densidade de preenchimento e a variação de algumas propriedades como o módulo de
elasticidade e a tensão de cedência.
This dissertation addresses the development of jigs and fixtures systems manufactured through 3D printing, using the Fused Deposition Modeling process for subsequent application in mechanical testing, specifically tensile and compression tests, as well as in the dimension control of injection molded polymer parts. The growing use of polymeric materials in industry, along with the demand for agile, adaptable, cost-effective and customized solutions, justifies the investigation of alternative manufacturing methods for metrological support devices and accessories for mechanical testing equipment. The methodology was initially based on theoretical research to support the entire project, followed by the design of Computer Aided Design models, the fabrication of these models using a Prusa printer and the subsequent evaluation of the results from various jigs that differed in geometric design, infill pattern, infill density and the materials used. This evaluation was carried out by directly applying the jigs in a tensile testing machine with the respective test specimens in the first case and using a coordinate measuring machine to measure parts for dimensions control in the second case, with the results being compared to existing established methods. Additionally, test specimens were printed for mechanical relationship between the increase in infill density and variations in properties such as the Young’s modulus and yield strength.
This dissertation addresses the development of jigs and fixtures systems manufactured through 3D printing, using the Fused Deposition Modeling process for subsequent application in mechanical testing, specifically tensile and compression tests, as well as in the dimension control of injection molded polymer parts. The growing use of polymeric materials in industry, along with the demand for agile, adaptable, cost-effective and customized solutions, justifies the investigation of alternative manufacturing methods for metrological support devices and accessories for mechanical testing equipment. The methodology was initially based on theoretical research to support the entire project, followed by the design of Computer Aided Design models, the fabrication of these models using a Prusa printer and the subsequent evaluation of the results from various jigs that differed in geometric design, infill pattern, infill density and the materials used. This evaluation was carried out by directly applying the jigs in a tensile testing machine with the respective test specimens in the first case and using a coordinate measuring machine to measure parts for dimensions control in the second case, with the results being compared to existing established methods. Additionally, test specimens were printed for mechanical relationship between the increase in infill density and variations in properties such as the Young’s modulus and yield strength.
Descrição
Palavras-chave
3D printing FDM Polymers Mechanical testing Metrology Dimensional Control Impressão 3D FFF Polímeros Ensaios mecânicos Metrologia Controlo dimensional