However, a limiting factor in AM is the as-built quality of surfaces. A key advantage to AM over formative (e.g., casting) or subtractive (e.g., milling) methods is the ability to produce highly complex shapes.

Once the layer is melted, the build platform lowers, new powder is spread across the build platform, and the process repeats until the build is complete. Laser Powder Bed Fusion (L-PBF), for example, will fabricate a part by spreading a thin layer of powder (20 µm to 100 µm) across a build platform and using a high power laser to selectively melt regions of that layer.

This is accomplished by slicing the model into layers to create 2-D cross sections that the equipment can use as build instructions. Introduction Additive manufacturing (AM) is a layer by layer process that fabricates parts directly from a 3-D digital model. Peer-review under responsibility of the scientific committee of the 3rd CIRP Conference on Surface Integrity (CIRP CSI) Keywords: Selective Laser Melting (SLM) Roughness Overhangsġ. This by is an open access Peer-review under responsibility of the scientific committee of the 3rd CIRP Conference on Surface Integrity (CIRP CSI) (). article under the CC BY-NC-ND license Published byAuthors. It was found that the analysis of surface roughness metrics, such as Rpc, Rsm, and Rc, can indicate a shift between surfaces dominated by partially melted powder particles and surfaces dominated by material from the re-solidified melt track. Analysis of the surface roughness was then performed to determine a relationship between process parameters, angle of the overhanging surface, and surface roughness. In order to optimize surface roughness in these structures, samples covering a range of overhang angles and process parameters were built in a laser powder bed fusion system.

However, a limiting factor of additive manufacturing is the as-built surface quality as well as the difficulty in maintaining an acceptable surface roughness in overhanging structures. E-mail address: Ībstract The development of additive manufacturing has allowed for increased flexibility and complexity of designs over formative and subtractive manufacturing. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20886, USA Available online at ScienceDirect Procedia CIRP 45 (2016) 131 – 134ģrd CIRP Conference on Surface Integrity (CIRP CSI)Įffect of process parameters on the surface roughness of overhanging structures in laser powder bed fusion additive manufacturing Jason C.

Markup pdf on surface