Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
TENSILE STRENGTH SPECIMENS FOR NON-SOLID BLOCK SUPPORT STRUCTURES MANUFACTURED BY LASER POWDER BED FUSION: A PRELIMINARY STUDY
Submission Author:
Dan Gallego , SC
Co-Authors:
Dan Gallego, Henrique Oliveira, Neri Volpato
Presenter: Dan Gallego
doi://10.26678/ABCM.COBEM2023.COB2023-0828
Abstract
Metal Laser-based Powder Bed Fusion (L-PBF) is a prominent category within Additive Manufacturing (AM), offering numerous advantages over traditional manufacturing techniques, including the ability to create complex geometries, produce items on demand, consolidate parts, improve energy efficiency, and reduce lead time. However, L-PBF also faces challenges, such as low productivity, inferior surface roughness, limited dimensional accuracy, and the need for support structures for overhang surfaces. Support structures in L-PBF are essential for enhancing heat dissipation, anchoring the part to the substrate, and reducing residual stress during printing. Despite their significance, limited research has been conducted on this subject. This paper provides an overview of different types of support structures and design aspects. The feasibility of manufacturing samples for tensile strength testing of non-solid block-type support structures based on the ASTM E8/E8M--16a standard was studied. Then, the impact of laser power and scanning speed on the consolidation interface between part and support was also investigated. Understanding and optimizing the processing of support structures can increase productivity, reduce manufacturing costs, minimize printing risks, and guarantee the repeatability of the designs. This research contributes to further advancements in designing support structures in L-PBF, making it a more efficient and reliable technique.
Keywords
Additive manufacturing, Selective laser melting, directed metal laser sintering, support structure, AISI 316L stainless steel
