Construcción de un modelo de fundición mediante la utilización de tecnología de impresión 3D.

Abstract

To make a process of sand casting a model that is an exact replica of the piece to be obtained is needed, in our environment models are constructed of Wood and through a traditional process, because this occurs the lack of accuracy in their dimensions, the main problem of wood is moisture absorption. A model using technology fused deposition modeling (FDM) or 3D printing was constructed, this technology allows direct printing of models from a digital file. With the use of this technology the accuracy in dimensions and shape is achieved, the material employed was highly resistant ABS plastic which considerably increases the mechanical properties and minimized moisture absorption, the ABS plastic can be machined and supports surface coatings. The correct selection of contractions and departure angles ensured the final properties of the model and a good surface finish; the model with a slow speed, height of 0,2 mm and a density of 50% bee honeycomb shape was constructed. In printing buckling problems arose, the material cools, rose from the hot bed due to own contractions of ABS, it is recommended to raise the adhesion putting hairspray in the hot bed of the printer. The casting model obtained was used practically in the foundry workshop at Mechanics faculty, noting that printing parameters were properly selected in the modeling stage.