Efeito das dimensões na precisão dimensional de peças fabricadas por impressão 3D utilizando PLA

Abstract

Additive Manufacturing (AM) works on the premise of adding layers of material until reaching the final product, while traditional manufacturing processes work by removing material from a raw part, modeling the object until reaching the desired result. With it, it is possible to optimize the process, eliminating losses and significantly reducing the time required for manufacturing. Fusion and Deposition Modeling (FDM), one of the methods used in 3D printing, is the most used AM technique with high growth potential. One of the challenges faced in any manufacturing process, as well as in additive manufacturing, is related to the metrological reliability of the manufactured product, since the dimensional accuracy of the printed part is of paramount importance in a highly competitive and globalized market. Therefore, the objective of this work is to analyze the dimensional accuracy of parts manufactured by 3D printing, verifying the influence of dimensions on the error produced in manufacturing, in order to obtain results that contribute to the choice of corrections to be applied when printing. After selecting the geometry, modeling and printing the specimens, measurements were taken at pre-determined points of the PCs of all chosen sizes. Therefore, it was possible to analyze, with the help of Analysis of Variance (ANOVA), the influence of part size on the dimensional accuracy of the process. Through the results obtained, it was possible to conclude that the size of the printed part directly influences the dimensional accuracy of the final product, given that the higher the CP, the greater the error obtained. Furthermore, the error curve for the process was drawn, allowing the maximum error point to be observed, in addition to the point of greatest dispersion (random error).