Volumetric covering print-paths for additive manufacturing of 3D models

Ezair, Ben; Fuhrmann, Saul; Elber, Gershon

doi:10.1016/j.cad.2018.02.006

Cited by 50 publications

(27 citation statements)

References 17 publications

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“…This method moved the path along a curved layer to improve the printed surface qualities. Similarly, Ezair et al [ 21 ] also proposed a curved layer path planning strategy that could improve the surface quality, using volumetric covering print paths for material extrusion AM. Jensen et al [ 22 ] proposed two path planning methods (path projection and parent–child approach) for five degrees of freedom (5DOF) and 6DOF material extrusion AM, respectively.…”

Section: Path Planning Strategiesmentioning

confidence: 99%

Path Planning Strategies to Optimize Accuracy, Quality, Build Time and Material Use in Additive Manufacturing: A Review

Jiang

2020

Micromachines

216

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Additive manufacturing (AM) is the process of joining materials layer by layer to fabricate products based on 3D models. Due to the layer-by-layer nature of AM, parts with complex geometries, integrated assemblies, customized geometry or multifunctional designs can now be manufactured more easily than traditional subtractive manufacturing. Path planning in AM is an important step in the process of manufacturing products. The final fabricated qualities, properties, etc., will be different when using different path strategies, even using the same AM machine and process parameters. Currently, increasing research studies have been published on path planning strategies with different aims. Due to the rapid development of path planning in AM and various newly proposed strategies, there is a lack of comprehensive reviews on this topic. Therefore, this paper gives a comprehensive understanding of the current status and challenges of AM path planning. This paper reviews and discusses path planning strategies in three categories: improving printed qualities, saving materials/time and achieving objective printed properties. The main findings of this review include: new path planning strategies can be developed by combining some of the strategies in literature with better performance; a path planning platform can be developed to help select the most suitable path planning strategy with required properties; research on path planning considering energy consumption can be carried out in the future; a benchmark model for testing the performance of path planning strategies can be designed; the trade-off among different fabricated properties can be considered as a factor in future path planning design processes; and lastly, machine learning can be a powerful tool to further improve path planning strategies in the future.

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Section: Path Planning Strategiesmentioning

confidence: 99%

Path Planning Strategies to Optimize Accuracy, Quality, Build Time and Material Use in Additive Manufacturing: A Review

Jiang

2020

Micromachines

216

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“…For a proper implementation of Powder Bed Fusion technology, and in particular Selective Laser Sintering/Melting, besides the control of the laser energy and parameters, also the control of the path followed by the laser beam is very important; it is still a research issue [15]. As a matter of fact, to properly fuse the powder within the desired cross section, the laser beam must move along a path, filling the cross-section itself.…”

Section: Laser Beam Controlmentioning

confidence: 99%

Driving Technologies for the Design of Additive Manufacturing Systems

Righettini

Strada²

2021

HighTech. Innov. J.

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The Additive Manufacturing (AM) technology, belonging to the most comprehensive Net Shape Forming family, has in recent years a growing trend due to the increasing quality of the built product. These results may open the application of the AM to the industrial field, moving the application from laboratories to the plant floor. This step requires machines capable of executing the technology process of AM with the requirements of the industrial environment, concerning as example the production speed, reliability, robustness, and process stability. The design of such type of machinery requires a systematic and multidisciplinary approach for reaching these industrial targets. Indeed the AM process involves several design technological issues, like temperature control of the material to be processed, characteristics of the energy source for material transition, control of the power transferred to the material, scanning system’s head control, 3D model’s layer definition, generation of the laser point’s trajectories. The final product’s quality strongly depends on all these aspects synergically linked each other, as well as on the technical solutions to realize them. The paper presents an interdisciplinary approach to the design of machines for AM, based on the Powder Bed Fusion process, and targeted to the industrial field. The technological platforms discussed in the paper are essential for such type of machines. The strategy proposed constitutes a base reference point for the definition of a methodological approach to the design of AM machinery. Doi: 10.28991/HIJ-2021-02-01-03 Full Text: PDF

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“…Reference [28] defines a slicing function that travels along a parametric curve (which the authors name streamline). References [29,30] fit B-Spline surfaces to the mesh.…”

Section: Non-parallel-planes Mesh Slicingmentioning

confidence: 99%

“…The computation of critical 0-manifold points is performed in lines[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], where each vertex is tested as a local minimum (or maximum). (4) Finally, lines 31-40 perform the computation of closed and oriented contours, including degenerate and non-degenerate saddle points.…”

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confidence: 99%

Level Sets of Weak-Morse Functions for Triangular Mesh Slicing

et al. 2020

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In the context of CAD CAM CAE (Computer-Aided Design, Manufacturing and Engineering) and Additive Manufacturing, the computation of level sets of closed 2-manifold triangular meshes (mesh slicing) is relevant for the generation of 3D printing patterns. Current slicing methods rely on the assumption that the function used to compute the level sets satisfies strong Morse conditions, rendering incorrect results when such a function is not a Morse one. To overcome this limitation, this manuscript presents an algorithm for the computation of mesh level sets under the presence of non-Morse degeneracies. To accomplish this, our method defines weak-Morse conditions, and presents a characterization of the possible types of degeneracies. This classification relies on the position of vertices, edges and faces in the neighborhood outside of the slicing plane. Finally, our algorithm produces oriented 1-manifold contours. Each contour orientation defines whether it belongs to a hole or to an external border. This definition is central for Additive Manufacturing purposes. We set up tests encompassing all known non-Morse degeneracies. Our algorithm successfully processes every generated case. Ongoing work addresses (a) a theoretical proof of completeness for our algorithm, (b) implementation of interval trees to improve the algorithm efficiency and, (c) integration into an Additive Manufacturing framework for industry applications.

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Volumetric covering print-paths for additive manufacturing of 3D models

Cited by 50 publications

References 17 publications

Path Planning Strategies to Optimize Accuracy, Quality, Build Time and Material Use in Additive Manufacturing: A Review

Path Planning Strategies to Optimize Accuracy, Quality, Build Time and Material Use in Additive Manufacturing: A Review

Driving Technologies for the Design of Additive Manufacturing Systems

Level Sets of Weak-Morse Functions for Triangular Mesh Slicing

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