Direct fabrication of unsupported inclined aluminum pillars based on uniform micro droplets deposition

Zhang, Daicong; Qi, Lehua; Luo, Jun; Yi, Hao; Hou, Xianghui

doi:10.1016/j.ijmachtools.2017.01.001

Cited by 43 publications

(19 citation statements)

References 26 publications

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“…As shown in Fig. 4(d 15,19 . Therefore, we expect that 3 slides are enough to enable printing of slender structures with arbitrary angles.…”

Section: Introductionmentioning

confidence: 78%

“…Droplets of wax 4 , solder 5,6 , aluminium 7 , gold 8 , copper 9,10 , and nano-particle suspension formulation 11,12 have been utilized to print structures with thin-walls and high aspect ratios 13 . Already, thin horizontal lines 5 , vertical 14 and inclined pillars 15 , slender walls 13,16 , and programmable 3D shapes 17 have been demonstrated to illustrate the droplet printing ability. However, up to now, building parts with overhangs without support is still exceedingly complex, since droplets deposited from a nozzle are typically aligned with gravity and can only be stacked up to a ~40 o angle 15 .…”

Section: Introductionmentioning

confidence: 99%

“…Already, thin horizontal lines 5 , vertical 14 and inclined pillars 15 , slender walls 13,16 , and programmable 3D shapes 17 have been demonstrated to illustrate the droplet printing ability. However, up to now, building parts with overhangs without support is still exceedingly complex, since droplets deposited from a nozzle are typically aligned with gravity and can only be stacked up to a ~40 o angle 15 . Changing the impact angle by rotating the nozzle is far from trivial, since current droplet ejection methods are sensitive to acceleration (gravitational or rotational acceleration).…”

Section: Introductionmentioning

confidence: 99%

“…3(c), (d)). The spacing between these beads is known to depend on the initial droplet temperature 15 , and was measured to be 0.28mm based on ten measurements along the centre axis. The joints formed by these low-temperature-slide guided droplets are quite weak.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Omnidirectional 3D printing of metal micro-architectures via droplet sliding over curved surfaces

Luo¹,

Cheng²,

Dong³

et al. 2021

Preprint

Self Cite

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As a simple, fast, and green 3D printing method, droplet-based manufacturing is suitable to print various materials to manufacture structures. However, up to now, it has hardly been capable of manufacturing omnidirectional designs with slender horizontal or upside-down sections, since the required rotation of the nozzle or workpiece negatively affects printing performance. Here, we employed a novel slide-guided droplet deposition method for printing parts with arbitrary-angle overhangs up to 180o. Arc-shaped slides with metallophobic surfaces are used to smoothly deflect droplets and provide a full control of droplets’ impact angle onto the workpiece. We show that gently curved impact surfaces prevent droplet bouncing, and quantitatively describe the transition from sliding to bouncing by measurements, simulations, and theory that predict our process window. Furthermore, the temperature of the slides is controlled to modify the temperature of droplets after they leave the generator, enabling fabrication of horizontal pillars with locally tunable morphology and optimization of drop-to-drop adhesion. The versatility of the slide-guided deposition is highlighted by fabricating structures with high aspect ratios and free-standing branches in arbitrary angles including hung sections where droplets are deposited from a fully reversed direction. Since the proposed slide-guided deposition uniquely facilitates fabrication of slender metal structures from arbitrary angles without rotating the workpiece or nozzle, it helps advance the development of many other research fields, such as antennas, branch-like heat sinks, and metal micro-lattices, where complex structures are needed.

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“…As shown in Fig. 4(d 15,19 . Therefore, we expect that 3 slides are enough to enable printing of slender structures with arbitrary angles.…”

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Omnidirectional 3D printing of metal micro-architectures via droplet sliding over curved surfaces

Luo¹,

Cheng²,

Dong³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Understanding the underlying physics of droplet solidification and controlling its process are of both fundamental and practical importance. Substantial studies have been reported regarding the solidification of metallic [252,253], non-metallic (e.g., wax [254], silicon [206]) and water droplets [255,256] on cold solid substrates.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

Zhang¹

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Thermal process simulation of droplet based metal printing with aluminium

Himmel

Rumschöttel

Volk

2018

Prod. Eng. Res. Devel.

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Direct fabrication of unsupported inclined aluminum pillars based on uniform micro droplets deposition

Cited by 43 publications

References 26 publications

Omnidirectional 3D printing of metal micro-architectures via droplet sliding over curved surfaces

Omnidirectional 3D printing of metal micro-architectures via droplet sliding over curved surfaces

Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

Thermal process simulation of droplet based metal printing with aluminium

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