Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Milling and Magnetic Abrasive Finishing of Directed Energy Deposited-316L Stainless Steels
Submission Author:
Adriel Magalhães Souza , SP
Co-Authors:
Adriel Magalhães Souza, Iago José Vasques, Eraldo Jannone da Silva, Reginaldo Coelho
Presenter: Adriel Magalhães Souza
doi://10.26678/ABCM.COBEM2021.COB2021-0053
Abstract
Additive Manufacturing (AM) technologies, commonly known as 3D printing, show high disruptive potential in current manufacturing industries, and Directed Energy Deposition (DED) is one of the most prominent in metal applications for the creation of near net shape components. Its processes combine material feedstock (powder or wire) and energy (e.g., laser, electron beam or electric arc) for layer by layer deposition, hence, formation of the metallic part. However, both dimensions and surface qualities of parts produced by DED are relatively poor, requiring post-processing operations. Traditional machining processes (e.g., milling) or even some advanced finishing processes (e.g., Magnetic Abrasive Finishing – MAF) are, therefore, necessary for the obtaining of the desired functional performance. This study evaluates the improvements achieved by milling and MAF operations in the surface quality of 316L stainless steels produced by DED, as well as the effects of post-processes on surface morphology and roughness. The roughness results showed 56.06 μm Ra and 242.80 μm Rz for the DEDed parts - such high values are due to the presence of adhered particles and bead profile. The irregularities of the outer layer and the non-fused powders on the surface were removed by milling, reducing Ra from approximately 56.06 μm to 0.08 μm and Rz from 242.80 μm to 0.56 μm. MAF produced smoother surfaces (0.03 μm Ra, and 0.24 μm Rz) free of milling marks and with mirror quality, indicating above 99.9% improvement. Milling proved efficient as an intermediate post-processing step between deposition and MAF in reducing the overall processing time in the manufacturing sequence of final components produced by AM technologies. Use of hybrid machines, association of deposition capabilities with machining and polishing in the same equipment, and only one gripping position can improve the manufacturing sequence, saving time, resources, and costs, and performing the whole sequence (AM+milling+MAF) in a same machine.
Keywords
Metal additive manufacturing, post-processing, Magnetic abrasive finishing, surface quality
DOWNLOAD PDF VIEW PRESENTATION
