Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Dimensional Accuracy for Additive Manufacturing
Submission Author:
Tiago Alves , DF
Co-Authors:
Tiago Alves, Alexandre Crepory Abbott de Oliveira, Andrea Cristina Santos
Presenter: Tiago Alves
doi://10.26678/ABCM.COBEM2019.COB2019-2460
Abstract
The Additive Manufacturing (AM) processes were developed to be a faster and easy way to prototype designs. Based on recent studies the layered based techniques are starting to become more predictable and their use for end parts is being developed along the academic researches and also being used in the industry for low volume productions. Nowadays the main goal of many studies is to provide knowledge of the process, to implement quality control of pieces and develop guidelines for design with additive manufacturing technologies. One of the issues in using additive manufacturing for final user products is the lack of control over dimensional accuracy. The standards for Geometric Dimensioning and Tolerancing (GD&T) are focused on materials that present uniformity of characteristics and based in bi-dimensional annotations, is not feasible to AM. This paper presents an evaluation of GD&T techniques, its limitations for AM and the proposed works to solve it. The study also presents an evaluation of accuracy for 3D printers, using an approach based on former studies for printers evaluation and analyzing the geometric accuracy for different process characteristics. Statistical methods are used to evaluate the influence of manufacturing parameters for AM in the final piece geometry, in an attempt to optimize settings according to the dimension precision obtained in each test specimen.
Keywords
Additive manufacturing, Geometric Dimensioning and Tolerances, Design for additive manufacturing
