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Abstract(s)
Um dos principais objetivos deste trabalho consistiu em estudar a potencialidade dos programas numéricos SOLIDCast e FLOWCast na previsão de defeitos de fabrico do processo de fundição.
Para cumprir tal objetivo, foram executadas simulações com diferentes parâmetros e formulações de fundição. Para cada um deles fez-se a análise do processo de solidificação e de enchimento, com o intuito de avaliar o seu comportamento e possibilidade de aparecimento de defeitos.
Na sequência do trabalho foi realizado um caso de estudo real, em que se pretendia determinar e corrigir as causas da ocorrência de um defeito de fabrico do tipo macrorechupe, que aparecia de forma aleatória numa peça fabricada na FAL. Nesse sentido, realizou-se uma primeira simulação, com os referidos programas numéricos, utilizando os parâmetros e formulação iniciais, correspondentes aos usados no fabrico do produto. Nesta primeira simulação verificou-se que uma possível causa para o aparecimento do rechupe seria a temperatura de vazamento das últimas ser muito baixa. Com o objetivo, de confirmar esse efeito realizaram-se várias simulações com diferentes parâmetros e formulações, tendo sido quantificado qual a importância de cada um deles para o aparecimento deste tipo de defeitos.
No final do trabalho são sugeridas algumas propostas para evitar ou minimizar o aparecimento do defeito ocorrido no caso de estudo. As propostas sugeridas foram previamente simuladas e verificada a sua eficiência na diminuição da formação de rechupes.
One of the most important goals of this work was to study the capability of the SOLIDCast FlowCast software to predict manufacturing defects of the casting process. To fulfil this aim, were performed simulations with different casting parameters and formulations. For each casting parameter and formulation was made an analysis of solidification and filling processes in order to evaluate their behaviour and potential defects manifestation. In the sequence of the work, was done a real case study, in which it was intended to determine and correct the causes of the occurrence of the manufacturing defect denominated macro shrinkage which have appeared randomly in some pieces manufactured in FAL. Accordingly, we carried out a first simulation, with the referred software using the initial parameters that correspond to the formulation used in the manufacture of the product. In this first simulation it was found that a possible cause for the appearance of shrinkage is due to the low temperature of the last patterns. With the aim of confirming this effect were implemented several simulations with different parameters and formulations, which have been quantified the importance of each to the appearance of such defects. At the end of the work are suggested and some proposals to avoid or minimize the appearance of the defect occurred in the case study. The proposals have been suggested previously simulated and verified its efficiency in reducing the formation of shrinkage.
One of the most important goals of this work was to study the capability of the SOLIDCast FlowCast software to predict manufacturing defects of the casting process. To fulfil this aim, were performed simulations with different casting parameters and formulations. For each casting parameter and formulation was made an analysis of solidification and filling processes in order to evaluate their behaviour and potential defects manifestation. In the sequence of the work, was done a real case study, in which it was intended to determine and correct the causes of the occurrence of the manufacturing defect denominated macro shrinkage which have appeared randomly in some pieces manufactured in FAL. Accordingly, we carried out a first simulation, with the referred software using the initial parameters that correspond to the formulation used in the manufacture of the product. In this first simulation it was found that a possible cause for the appearance of shrinkage is due to the low temperature of the last patterns. With the aim of confirming this effect were implemented several simulations with different parameters and formulations, which have been quantified the importance of each to the appearance of such defects. At the end of the work are suggested and some proposals to avoid or minimize the appearance of the defect occurred in the case study. The proposals have been suggested previously simulated and verified its efficiency in reducing the formation of shrinkage.
Description
Keywords
Fundição em areia Simulação numérica SOLIDCast FLOWCast