Influência dos compostos na manufatura por impressão 3Dprinter no comportamento mecânico biomodelos
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Data
2017-08-31
Autores
Sales, Nicolas Coelho [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Na medicina atual, uma técnica destaca-se cada vez mais, a biomodelagem. Esta técnica consiste na construção de um biomodelo físico a partir de imagens bidimensionais (de tomografias, ressonâncias, ultrassom), que são tratadas e através de softwares transformadas em um biomodelo virtual que por fim torna-se um biomodelo físico, impresso por uma impressora tridimensional, possibilitando a equipe médica, a percepção de detalhes dificilmente observados apenas através de imagens bidimensionais. Porém o material importado utilizado na biomodelagem é de custo elevado. Neste trabalho o objetivo foi através de uma formulação tida como ideal, publicada no artigo de (Meira), variar as porcentagens de sua composição, o ligante utilizado, o método de mistura, as granulometrias dos pós e adicionar um novo constituinte (sulfato de magnésio), e assim, adquirir um material mais barato e observar qual a influência da composição e granulometria em propriedades fundamentais para a qualidade de um pó para manufatura aditiva, tais como fluidez para distribuição homogênea, alto empacotamento das partículas para maximizar a densidade das peças, espessura da camada maior que as dimensões dos aglomerados e bom acabamento superficial após a camada ser depositada. Posteriormente, foram produzidos corpos de prova com diferentes composições, granulometrias e submetidos a ensaios de compressão e flexão três pontos. Após estes ensaios, médias e desvios padrões foram calculados para cada composição e granulometria. Por fim, a composição que apresentou os melhores resultados foi comparada ao material importado atualmente utilizado. O novo material, com custo de produção por volta de dez vezes menor, atendou às necessidades mecânicas que um biomodelo exige, como por exemplo, resistência mínima ao manuseio.
In modern medicine, a technique that stands out increasingly is biotemplating. This technique involves the construction of a physical biomodel from two-dimensional images (tomography, resonance, ultrasound) which are handled and by software processed in a virtual biomodel which eventually becomes a physical biomodel printed by the 3D printer, allowing the medical team, the perception of details hardly observed through two-dimensional images. However the material used in the imported biotemplating is relatively expensive. In this work the aim was through regarded as optimum formulation published in the article (Meira, 2013) vary the percentages of composition (and adding a new constituent, magnesium sulfate), the binder used, the mixing method and granulometry of powders, and thus acquire a more inexpensive material and understand which influences the composition and granulometry properties essential to the quality of a powder additive manufacturing, such as flowability for homogeneous distribution, higher packing of the particles to maximize the density of manufactured, thickness of the layer higher than the dimensions of the agglomerates and good surface finish after the layer is deposited. Later, produced specimens with different compositions and particle sizes, and subjected them to compression tests and bending three points. After these tests, averages and standard deviations were calculated for each composition and grain size. Finally, the best results were compared to the imported material currently used. The new material, with a cost around ten times lower, meets the mechanical requirements that a biomodel requires, for example, minimum handling strength.
In modern medicine, a technique that stands out increasingly is biotemplating. This technique involves the construction of a physical biomodel from two-dimensional images (tomography, resonance, ultrasound) which are handled and by software processed in a virtual biomodel which eventually becomes a physical biomodel printed by the 3D printer, allowing the medical team, the perception of details hardly observed through two-dimensional images. However the material used in the imported biotemplating is relatively expensive. In this work the aim was through regarded as optimum formulation published in the article (Meira, 2013) vary the percentages of composition (and adding a new constituent, magnesium sulfate), the binder used, the mixing method and granulometry of powders, and thus acquire a more inexpensive material and understand which influences the composition and granulometry properties essential to the quality of a powder additive manufacturing, such as flowability for homogeneous distribution, higher packing of the particles to maximize the density of manufactured, thickness of the layer higher than the dimensions of the agglomerates and good surface finish after the layer is deposited. Later, produced specimens with different compositions and particle sizes, and subjected them to compression tests and bending three points. After these tests, averages and standard deviations were calculated for each composition and grain size. Finally, the best results were compared to the imported material currently used. The new material, with a cost around ten times lower, meets the mechanical requirements that a biomodel requires, for example, minimum handling strength.
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Palavras-chave
Impressão tridimensional, 3Dprinter, Biomodelgem, Composição, Granulometria, Three-dimensional printing, Biomodeling, Composition, Granulometry