Diseño y Fabricación de Cavidades de Moldeo Obtenidas Mediante Impresión 3D Estereolitografía (SLA) para Inyección de Piezas Plásticas

In this work, moulding cavities were designed and manufactured using 3D printing, specifically stereolithography (SLA), to inject polypropylene (PP) parts. CAD/CAE systems were used to model the solids to be obtained and, based on these, to design the inserts. These were produced with VeroWhitePlus and integrated into a standard mould with insert-holder plates to adapt to different models. Simulations and calculations were carried out to determine the injection point and the design of the distribution and throttling channels to optimize the feeding system. The cooling system was sized based on the Bayer mould design manual. They were validated using a thermal simulation, analyzing the spread of the injection temperature in the insert and its response during cooling. The ejection system was calculated based on Shigley's mathematical models. The mechanical strength of the inserts was analyzed using a stress-strain simulation using ANSYSTM, obtaining a maximum deformation of 0.04 mm. This allowed the verification that the printed inserts with 7 mm walls could withstand deformations during the injection process.