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Abstract(s)
Portugal é um dos grandes produtores de moldes para injeção de plástico a nível mundial, sendo reconhecido pelas várias patentes registadas. Portanto, esta área é um enorme pilar da metalomecânica nacional, o que, consequentemente, resulta num pesado impacto na economia do país, pois não envolve só os próprios produtores de moldes, mas também todas as grandes empresas fornecedoras de metais no país. A projeção e produção de um novo molde é sempre um desafio, devido à sua unicidade individual ser uma característica latente. Cada molde é um novo desafio, pois não existem dois moldes iguais, e a sua complexidade pode variar com o mesmo intervalo que existe entre construir uma simples casa familiar e construir o maior arranha céus do mundo. Esta dissertação descreve o desenvolvimento de um molde de bi-injeção para uma peça exclusiva com uma geometria exigente, que envolve movimentos mecânicos complexos, possui dois polímeros distintos na sua constituição e necessita de cumprir um nível de qualidade elevado e irrepreensível. Na indústria dos moldes para injeção de plástico, o cliente está apenas interessado em obter um molde o mais económico possível, que produza a(s) peça(s) com a qualidade pretendida e com um tempo de ciclo de injeção o mais baixo possível, uma vez que isso é diretamente refletido numa peça de menor custo. Muitas vezes, obter um tempo de ciclo mais baixo que o da concorrência, para aquele molde em específico, é o maior desafio para o engenheiro envolvido. A peça que foi produzida necessitou apenas de ajustes mínimos, o que demonstrou uma certa experiência na criação do um modelo virtual da mesma por parte do cliente final. Como resultado final, o molde foi produzido sem necessidade de alterações ao orçamento final, o que aumenta a satisfação do cliente final e, após ensaios de injeção e ajustes realizados, a peça final foi concretizada com a excelente qualidade requerida, sendo aprovada pelo mesmo.
Portugal is one of the biggest injection mold producers in the world, being recognized as such, for all the patents that it has. The industry of molds is essential for the national metalworking industry, so that results in a major impact in the country´s economic, not only because it involves the productors of molds, but also, other big companies which provide steels and other metals in the country. All the process of making a mew mold it’s always a challenge, due to its individual singularity being a latent feature. Each mold it’s a challenge, because there are no two alike and its complexity can change whit the same gap that exists between building a simple family home and building the largest skyscraper in the world. This master's degree dissertation describes the development of a bi-injection mold for a piece with a big demanding geometry, that involves complex mechanical movements, two distinguished polymers in its constitution and it needs to accomplish highest and faultless quality level. In the injection mold industry, the customer is only interested in getting the most economical mold possible, which produces the part(s) of the desired quality whit the shortest possible injection cycle time, because this is directly reflected in a lower production cost. Often, getting a lower cycle time than the competition, for that particular mold, is the biggest challenge for the engineer involved. The piece that was produced has required only minimal adjustments, which demonstrated a certain experience in creating a virtual model of it by the final client. As a result, the mold was produced without alterations in the final quotation, which increases the customer satisfaction and, after injection tests and adjustments, the final piece was finished with excellent quality, it meets the final customer expectations, so it was approved by him.
Portugal is one of the biggest injection mold producers in the world, being recognized as such, for all the patents that it has. The industry of molds is essential for the national metalworking industry, so that results in a major impact in the country´s economic, not only because it involves the productors of molds, but also, other big companies which provide steels and other metals in the country. All the process of making a mew mold it’s always a challenge, due to its individual singularity being a latent feature. Each mold it’s a challenge, because there are no two alike and its complexity can change whit the same gap that exists between building a simple family home and building the largest skyscraper in the world. This master's degree dissertation describes the development of a bi-injection mold for a piece with a big demanding geometry, that involves complex mechanical movements, two distinguished polymers in its constitution and it needs to accomplish highest and faultless quality level. In the injection mold industry, the customer is only interested in getting the most economical mold possible, which produces the part(s) of the desired quality whit the shortest possible injection cycle time, because this is directly reflected in a lower production cost. Often, getting a lower cycle time than the competition, for that particular mold, is the biggest challenge for the engineer involved. The piece that was produced has required only minimal adjustments, which demonstrated a certain experience in creating a virtual model of it by the final client. As a result, the mold was produced without alterations in the final quotation, which increases the customer satisfaction and, after injection tests and adjustments, the final piece was finished with excellent quality, it meets the final customer expectations, so it was approved by him.
Description
Keywords
Molde Injeção Polímero Bi-matéria Bi-injeção Polipropileno (PP) Polietileno de alta densidade (HDPE) Simulação Dimensionamento Desenho Montagem Mold Structure Injection Polymer Bi-Matter Bi-Injection Polypropylene (PP) High Density Polyethylene (HDPE) Simulation Dimensioning Drawing Assembly