An approach to partition workpiece CAD model towards 5-axis support-free 3D printing

Liu, Hao; Liu, Lei; Li, Dawei; Huang, Renkai; Dai, Ning

doi:10.1007/s00170-019-04495-3

Cited by 17 publications

(6 citation statements)

References 38 publications

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“…Based on the 3+2-aixs configuration, Bhatt et al [24] developed an algorithm to print accurate thin-shell parts with no support. Similar research can also be found in [25][26][27][28][29][30][31]. Nonetheless, all these improvements are based on the 3+2-axis configuration, which become less effective for freeform parts with complex features and thus lack generality.…”

Section: Introductionmentioning

confidence: 65%

Multi-Axis Support-Free Printing of Freeform Parts with Lattice Infill Structures

Tang

et al. 2021

Computer-Aided Design

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Section: Introductionmentioning

confidence: 65%

Multi-Axis Support-Free Printing of Freeform Parts with Lattice Infill Structures

Tang

et al. 2021

Computer-Aided Design

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“…Support-free or multi-axis printing is usually dependent on model segmentation path planning, which generally has five categories based on segmentation methods: i) Separate identification of overhanging structures [23] ; ii) Guidance with model skeletons [24,25] ; (iii) Establishment of objective optimization patterns under constraints of support structure minimization and no collision at junctions [26,27] ; iv) Model voxelization [28,29] ; and (v) Distinction of surface and internal structure. [30][31][32] The segmentation model path planning algorithm is well suited to complex structures, but the mechanical strength of model joints may be an Achilles heel.…”

Section: Discussionmentioning

confidence: 99%

Whole Model Path Planning‐Guided Multi‐Axis and Multi‐Material Printing of High‐Performance Intestinal Implantable Stent

Wang

Huang

et al. 2023

Adv Healthcare Materials

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The problems of step effects, supporting material waste, and conflict between flexibility and toughness for 3D printed intestinal fistula stents are not yet resolved. Herein, the fabrication of a support‐free segmental stent with two types of thermoplastic polyurethane (TPU) using a homemade multi‐axis and multi‐material conformal printer guided with advanced whole model path planning is demonstrated. One type of TPU segment is soft to increase elasticity, and the other is used to achieve toughness. Owing to advancements in stent design and printing, the obtained stents present three unprecedented properties compared to previous three‐axis printed stents: i) Overcoming step effects; ii) Presenting comparable axial flexibility to a stent made of a single soft TPU 87A material, thus increasing the feasibility of implantation; and iii) Showing equivalent radial toughness to a stent made of a single hard TPU 95A material. Hence, the stent can resist the intestinal contractive force and maintain intestinal continuity and patency. Through implanting such stents to the rabbit intestinal fistula models, therapeutic mechanisms of reducing fistula output and improving nutritional states and intestinal flora abundance are revealed. Overall, this study develops a creative and versatile method to improve the poor quality and mechanical properties of medical stents.

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“…Several research investigations have been focused on the improvement of AM processes and overcoming the limitations and challenges imposed by several factors and key parameters, such as the mechanical proprieties of raw materials [17][18][19][20], dimensional and geometrical tolerances [21,22], non-assembly mechanisms [23], build orientation [24][25][26][27], thermal behavior [20,28], and microstructural characterization [28].…”

Section: Related Workmentioning

confidence: 99%

Minimizing Dimensional Defects in FFF Using a Novel Adaptive Slicing Method Based on Local Shape Complexity

Elayeb,

Tlija,

Eltaief

et al. 2024

JMMP

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Additive Manufacturing (AM) has emerged as an innovative technology that gives designers several advantages, such as geometric freedom of design and less waste. However, the quality of the parts produced is affected by different design and manufacturing parameters, such as the part orientation, the nozzle temperature and speed, the support material, and the layer thickness. In this context, the layer thickness is considered an important AM parameter affecting the part quality and accuracy. Thus, in this paper, a new adaptative slicing method based on the cusp vector and the surface deviation is proposed with the aim of minimizing the dimensional defects of FFF printed parts and investigate the impact on the dimensional part tolerancing. An algorithm is developed to automatically extract data from the STL file, select the build orientation, and detect intersection points between the initial slicing and the STL mesh. The innovation of this algorithm is exhibited via adapting the slicing according to the surface curvature based on two factors: the cusp vector and the surface deviation. The suggested slicing technique guarantees dimensional accuracy, especially for complex feature shapes that are challenging to achieve using a uniform slicing approach. Finally, a preview of the slicing is displayed, and the G-code is generated to be used by the FFF machine. The case study consists of the dimensional tolerance inspection of prototypes manufactured using the conventional and adaptive slicing processes. The proposed method’s effectiveness is investigated using RE and CMM processes. The method demonstrates its reliability through the observed potential for accuracy improvements exceeding 0.6% and cost savings of up to 4.3% in specific scenarios. This reliability is substantiated by comparing the resulting dimensional tolerances and manufacturing costs.

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An approach to partition workpiece CAD model towards 5-axis support-free 3D printing

Cited by 17 publications

References 38 publications

Multi-Axis Support-Free Printing of Freeform Parts with Lattice Infill Structures

Multi-Axis Support-Free Printing of Freeform Parts with Lattice Infill Structures

Whole Model Path Planning‐Guided Multi‐Axis and Multi‐Material Printing of High‐Performance Intestinal Implantable Stent

Minimizing Dimensional Defects in FFF Using a Novel Adaptive Slicing Method Based on Local Shape Complexity

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