Loading...
Publication
Otimização de componentes mecânicos produzidos por fabrico aditivo para contacto alimentar
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 16.66 MB | Adobe PDF |
Advisor(s)
Abstract(s)
O fabrico aditivo tem vindo a ser cada vez mais implementado na indústria, independentemente
do setor desta. O tempo de produção reduzido para componentes, de pequeno a medio porte, é
um dos fatores que mais influencia nesta aplicação, assim como, a sua capacidade de produção de
componentes com geometrias complexas.
Esta dissertação foi devolvida no âmbito de um estágio na empresa LaniRobotics e teve como
principal objetivo o fabrico de componentes mecânicos por manufatura aditiva para utilização na
indústria alimentar.
O objetivo surgiu devido a uma limitação da tecnologia FDM. Esta tecnologia produz as suas peças
camada-a-camada deixando na sua interface pequenas fissuras onde se podem alojar colónias de
bactérias e/ou fungos.
Foram fabricados provetes em PETG por FDM com diferentes alturas de camada e preenchimento
(infill). Alguns provetes também foram revestidos com uma resina de epóxido isenta bisfenol A. A
partir de uma inspeção visual foi possível constatar que os provetes não apresentavam defeitos
superficiais notáveis como, por exemplo fissuras e descoesão entre camadas, após a sua produção.
Através do mesmo tipo de inspeção, foi possível observar, no caso dos provetes revestidos com
epóxido, a existência de uma boa adesão deste revestimento à superfície do provete.
Os provetes foram submetidos a um ensaio microbiano, de forma a poder analisar qual seria o
melhor tipo superfície, com ou sem revestimento para a utilização na indústria alimentar.
Através da análise dos resultados obtidos do ensaio, foi possível perceber que a solução estaria na
utilização de uma camada baixa e que a utilização de revestimento melhora significativamente a
qualidade superficial.
Additive manufacturing has been increasingly implemented in industry, regardless of the sector. The reduced production time for small to medium-sized components is one of the most influential factors in this application, as is its ability to produce components with complex geometries. This dissertation was returned as part of an internship at the company LaniRobotics and its main objective was the manufacture of mechanical components by additive manufacturing for use in the food industry. The objective arose due to a limitation of FDM technology. This technology produces its parts layer by layer, leaving small cracks at the interface where colonies of bacteria and/or fungi can lodge. PETG specimens were manufactured by FDM with different layer heights and infills. Some specimens were also coated with a bisphenol A-free epoxy resin. A visual inspection showed that the specimens did not have any noticeable surface defects, such as cracks or disconnections between layers, after production. The same type of inspection showed that the epoxy-coated specimens adhered well to the surface of the specimen. The specimens were subjected to a microbial test in order to analyze which type of surface, with or without coating, would be best for use in the food industry. By analyzing the test results, it was possible to see that the solution would be to use a low layer and that the use of a coating significantly improves surface quality.
Additive manufacturing has been increasingly implemented in industry, regardless of the sector. The reduced production time for small to medium-sized components is one of the most influential factors in this application, as is its ability to produce components with complex geometries. This dissertation was returned as part of an internship at the company LaniRobotics and its main objective was the manufacture of mechanical components by additive manufacturing for use in the food industry. The objective arose due to a limitation of FDM technology. This technology produces its parts layer by layer, leaving small cracks at the interface where colonies of bacteria and/or fungi can lodge. PETG specimens were manufactured by FDM with different layer heights and infills. Some specimens were also coated with a bisphenol A-free epoxy resin. A visual inspection showed that the specimens did not have any noticeable surface defects, such as cracks or disconnections between layers, after production. The same type of inspection showed that the epoxy-coated specimens adhered well to the surface of the specimen. The specimens were subjected to a microbial test in order to analyze which type of surface, with or without coating, would be best for use in the food industry. By analyzing the test results, it was possible to see that the solution would be to use a low layer and that the use of a coating significantly improves surface quality.
Description
Keywords
Fabrico aditivo FDM Contacto alimentar Resina Epóxi Revestimento Revestimento de superfície