Path smoothing and feed rate planning for robotic curved layer additive manufacturing

Xie, Fubao; Chen, Lufeng; Li, Zhaoyu; Tang, Kai

doi:10.1016/j.rcim.2020.101967

Cited by 57 publications

(19 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But some limitations are there in non-planar printing such as collision and nozzle orientation. These limitations can be removed by redesigning the extruder nozzle geometry, even adding an axis to gain motion flexibility [3], [41]. When viewing from this aspect, the planar slicing stays behind non-planar slicing in terms of surface quality and mechanical property.…”

Section: Discussionmentioning

confidence: 99%

Non-Planar Toolpath for Large Scale Additive Manufacturing

Eyerci̇oğlu

Aladağ

2021

International Journal of 3D Printing Technologies and Digital Industry

View full text Add to dashboard Cite

The parts produced by additive manufacturing are inherently subjected to discretization effects due to their layer-based addition. The stair-stepping effect on the surface quality is inevitable for most of the techniques and it becomes more dominant for the regions having small surface inclinations. The stair-stepping influences the mechanical properties as well as the aesthetic perception. Many researchers have been presented several approaches to overcome or minimize the stair-stepping effects and improve the surface quality of additively manufactured parts. One of these methods is non-planar slicing. The stair-stepping effect was significantly decreased by this method. The attempts have been made generally for the FDMprinted objects, however, there is no or fewer efforts have been made for parts of large-scale additive manufacturing (LSAM). Due to higher deposition rates and larger nozzle diameters (i.e. bead size), the discretization effect is more in large-scale additive manufacturing. In this paper, the presented methods to mitigate the stair-stepping effect and improving the surface quality of additive manufacturing are reviewed, and practicing in large-scale 3D printing is discussed. Moreover, a preliminary experimental study of 3D printing with a non-planar toolpath was carried out and the results were presented.

show abstract

Section: Discussionmentioning

confidence: 99%

Non-Planar Toolpath for Large Scale Additive Manufacturing

Eyerci̇oğlu

Aladağ

2021

International Journal of 3D Printing Technologies and Digital Industry

View full text Add to dashboard Cite

show abstract

“…A recurring problem is how to assure the stability and safety of the multiaxis motion, which greatly influences the depositing qualities. Researchers at The Hong Kong University of Science and Technology (China) presented a practical B-spline-based smoothing algorithm for removing sharp corners on the printing path and a feed rate scheduling strategy subject to the kinematic constraints of six robot arm joints (Xie et al, 2020). Dai et al (2018) and colleagues presented an algorithm for decomposing a volume into a sequence of accessible surfaces with nearly uniform thickness to guarantee accessibility for deposition.…”

Section: Multiaxis Motionmentioning

confidence: 99%

“…The combined use of multiaxis robot systems and AM technologies offer the possibility for multiaxis three-dimensional printing and the fabrication of complex geometries in different manufacturing environments (Urhal et al, 2019). However, the situation becomes particularly intricate in multiaxis fabrication, which motivates prompt development in multiaxis printing (Xie et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Multiaxis wire and arc additive manufacturing for overhangs based on conical substrates

Dai

Zhang²,

et al. 2021

RPJ

View full text Add to dashboard Cite

Purpose This paper aims to present a series of approaches for three-related issues in multiaxis in wire and arc additive manufacturing (WAAM) as follows: how to achieve a stable and robust deposition process and maintain uniform growth of the part; how to maintain consistent formation of a melt pool on the surface of the workpiece; and how to fabricate an overhanging structure without supports. Design/methodology/approach The principal component analysis-based path planning approach is proposed to compute the best scanning directions of slicing contours for the generation of filling paths, including zigzag paths and parallel skeleton paths. These printing paths have been experimented with in WAAM. To maintain consistent formation of a melt pool at overhanging regions, the authors introduce definitions for the overhanging point, overhanging distance and overhanging vector, with which the authors can compute and optimize the multiaxis motion. A novel fabricating strategy of depositing the overhanging segments as a support for the deposition of filling paths is presented. Findings The second principal component of a planar contour is a reasonable scanning direction to generate zigzag filling paths and parallel skeleton filling paths. The overhanging regions of a printing layer can be supported by pre-deposition of overhanging segments. Large overhangs can be successfully fabricated by the multiaxis WAAM process without supporting structures. Originality/value An intelligent approach of generating zigzag printing paths and parallel skeleton printing paths. Optimizations of depositing zigzag paths and parallel skeleton paths. Applications of overhanging point overhanging distance and overhanging vector for multiaxis motion planning. A novel fabricating strategy of depositing the overhanging segments as a support for the deposition of filling paths.

show abstract

“…The anisotropy of mechanical strength on models fabricated by FDM has been studied by experiments in prior work [Ahn et al 2002;Tam and Mueller 2017]. The fractographic analysis using scanning electron microscope (SEM) images [Riddick et al 2016] has shown that the weak adhesion between neighboring layers and also the incompletely filled area between filaments [Xie et al 2020] are the major reasons for tensile failure. This anisotropy in yield strength is also demonstrated in our experiment with tensile and compression tests on different specimens printed along different directions (see Fig.…”

Section: Anisotropic Strengthmentioning

confidence: 99%

Reinforced FDM

et al. 2020

View full text Add to dashboard Cite

The anisotropy of mechanical strength on a 3D printed model can be controlled in a multi-axis 3D printing system as materials can be accumulated along dynamically varied directions. In this paper, we present a new computational framework to generate specially designed layers and toolpaths of multi-axis 3D printing for strengthening a model by aligning filaments along the directions with large stresses. The major challenge comes from how to effectively decompose a solid into a sequence of strength-aware and collision-free working surfaces. We formulate it as a problem to compute an optimized governing field together with a selected orientation of fabrication setup. Iso-surfaces of the governing field are extracted as working surface layers for filament alignment. Supporting structures in curved layers are constructed by extrapolating the governing field to enable the fabrication of overhangs. Compared with planar-layer based Fused Deposition Modeling (FDM) technology, models fabricated by our method can withstand up to 6 . 35× loads in experimental tests.

show abstract

Path smoothing and feed rate planning for robotic curved layer additive manufacturing

Cited by 57 publications

References 24 publications

Non-Planar Toolpath for Large Scale Additive Manufacturing

Non-Planar Toolpath for Large Scale Additive Manufacturing

Multiaxis wire and arc additive manufacturing for overhangs based on conical substrates

Reinforced FDM

Contact Info

Product

Resources

About