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Progress in Additive Manufacturing

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26.06.2021 | Full Research Article

Skeleton-based perpendicularly scanning: a new scanning strategy for additive manufacturing, modeling and optimization

verfasst von: Mostapha El Jai, Iatimad Akhrif, Nourddin Saidou

Erschienen in: Progress in Additive Manufacturing | Ausgabe 4/2021

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Abstract

Actually, additive manufacturing (AM) is considered as a major class of complex parts manufacturing technologies. Including a wide range of materials, a huge set of physico-chemical phenomena are involved and adapted to control and master the variety of materials processing. On the other side, AM still knows a low productivity rate, due to different reasons that are mainly related to the material-process interaction control. In this paper, the authors propose a novel 2D scanning strategy that could be adapted to AM processes such as Laser Beam Powder Bed Fusion of Metals (PBF-LB/M) and polymers (PBF-LB/P), Electron Beam Powder Bed Fusion for metals (PBF-EB/M), and Material Extrusion-based (MEx) (ISO/ASTM 52,900 standards). The novelty presented corresponds to a Skeleton Based Perpendicularly (SBP) scanning strategy that aims to reduce the scanning lengths, and thus the production time and processing energy. The competitiveness of the new technique is mainly discussed according to the hatch space distance and the dimensions of a rectangular shape that was selected for the proof of concept of this new scanning strategy. In other words, it is proposed to investigate the competitiveness of the new scanning technique compared to four classical scanning strategies that are widely used in AM in term of process productivity. A detailed benchmark analysis has been applied to the following strategies: chess, stripe, spiral, and contour scanning. An analytical mathematical modeling was developed leading to the evaluation of the performance of SBP scanning compared to the scanning benchmark strategies by means of two proposed geometrical indices: the “gain of length” and the “specific gain of length per surface unit”. These were exploited in two separate study cases. The simulation showed that the SBP scanning length exhibits an increasing quadratic dependence on rectangle dimensions and a decreasing hyperbolic behavior according to hatch space distance. The lengths of the benchmark scanning strategies also presented a hyperbolic decreasing behavior according to hatch space distance. After that, it was proved that the SBP strategy is absolutely competitive compared to chess and stripe scanning; the competitiveness fluctuates around 95%, but it is highly concentrated around 100%. Otherwise, for the contour and stripe strategies, it has been shown that the competitiveness is strongly affected by the hatch space distance and by the dimensions of the shape being scanned. A particular behavior of the feasibility percentage of decision variable combinations, was detected as power laws or polynomials of the hatch space distance in the case of SBP/spiral comparison. In this case, the competitiveness (feasibility) ranged from 20 to 98% while it ranged from 0 to 75% in the case of SBP/contour comparison. The results of this study could also constitute a major contribution to related scientific and technical fields concerned with optimal area or volume control.

Vorheriger Artikel Fracture testing of polymer materials processed via fused filament fabrication: a survey of materials, methods, and design applications

Nächster Artikel The effects of printing parameters on quality, strength, mass, and processing time of polylactic acid specimens produced by additive manufacturing

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Titel: Skeleton-based perpendicularly scanning: a new scanning strategy for additive manufacturing, modeling and optimization
verfasst von: Mostapha El Jai
Iatimad Akhrif
Nourddin Saidou
Publikationsdatum: 26.06.2021
Verlag: Springer International Publishing
Erschienen in: Progress in Additive Manufacturing / Ausgabe 4/2021
Print ISSN: 2363-9512
Elektronische ISSN: 2363-9520
DOI: https://doi.org/10.1007/s40964-021-00197-z

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