Stable micro-feeding of fine powders using a capillary with ultrasonic vibration

Qi, Lehua; Zeng, Xianghui; Zhou, Jiming; Luo, Jun; Chao, Yanpu

doi:10.1016/j.powtec.2011.08.015

Cited by 29 publications

(7 citation statements)

References 17 publications

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“…In terms of the powder feeding nozzle geometry, according to Qi's study [23], the angle of the orifice between 30 and 60 could generate good flows and the feeding can be accurately controlled with a ratio of 3-8 between the orifice diameter and the maximum powder size. Therefore, the orifice angle was 30 0 in the experiments.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

An Integrated Dual Ultrasonic Selective Powder Dispensing Platform for Three-Dimensional Printing of Multiple Material Metal/Glass Objects in Selective Laser Melting

Zhang

Wei

Chueh

et al. 2018

Journal of Manufacturing Science and Engineering

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In this paper, we present a new approach of combining point-by-point selective powder delivery with powder bed fusion for multiple material (metal/glass) components printing. Dual ultrasonic vibration was used to achieve stable flowrates of both 316 L steel and soda-lime glass powders which were dispensed selectively and separately. The effects of the stand-off distance and the scanning speeds on the quality of the formed layers were investigated. The results showed that the ratio between the stand-off distance and the powder size (h/d) should be lower than 3 for accurate selective material deposition. However, in practical processing, for preventing the nozzle from being damaged by the parts, the stand-off distance was larger than three times of the powder size. Different laser processing parameters were developed for processing the metal and glass due to material property differences. The interfaces between 316 L and soda-lime glass were examined. A number of 3D objects consisting of metal and glass were printed using this method.

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Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

An Integrated Dual Ultrasonic Selective Powder Dispensing Platform for Three-Dimensional Printing of Multiple Material Metal/Glass Objects in Selective Laser Melting

Zhang

Wei

Chueh

et al. 2018

Journal of Manufacturing Science and Engineering

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“…[8][9][10] Acoustic actuation is an emerging approach to deposit powders. Acoustic wave enables particles or liquids to flow out from a small nozzle [11,12] and has been previously applied in liquid atomization, [13][14][15][16] particle feeding, [17][18][19][20][21] and AM. [22][23][24][25][26] Compared with primary deposition approaches used in powder-based AM, such as roller spreading [27,28] and gas blowing, [29,30] implementing acoustic waves enables depositing a wide range of powders and avoids complex instrumentations for feeding.…”

Section: Introductionmentioning

confidence: 99%

Acoustic‐Modulated, Selective Particle Deposition for Muti‐Material Additive Manufacturing

Scott

Bangel

Song

et al. 2023

Adv Materials Technologies

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Powder‐based additive manufacturing (AM) is an important technology in fabricating complex 3D products. In powder‐based AM, a powder deposition system plays a key role in determining the resolution, density, and properties of printed parts. An acoustic‐actuated particle deposition approach, which utilizes acoustic waves to actuate a glass nozzle, enables the deposition of particles in a cost‐effective way. However, the capability to programmably deposit different particles using acoustic waves has yet to be fully demonstrated. Herein, a selective particle deposition approach via acoustic modulation for muti‐material AM is demonstrated. Sequential and parallel depositions of two types of particles by modulating the signal inputs and resonant frequencies of piezo transducers are demonstrated. An AM process is demonstrated by integrating this acoustic‐actuated particle deposition approach with a heat‐curing mechanism. Several products from this system are produced as well. It is expected that this particle deposition approach can be used in a wide spectrum of applications, such as direct manufacturing of multi‐functional materials/devices.

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“…An agitating device [9], an oscillating sieve [10], or vibrations were applied to dose the desired amount of powder. To avoid bridging and blocking, feeding through capillaries was performed using vibrations either via acoustic or ultrasound generation [11][12][13][14][15]. The feed rate is controlled by the orifice diameter and the frequency and amplitude of the oscillation.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of a Novel Micro-feeder and Loss-in-weight Feeders

2021

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Purpose Accurate and reliable feeding of small quantities of powder is crucial in many industries. It is particularly true in the case of pharmaceutical manufacturing. First, the exact dosage of highly potent active pharmaceutical ingredients (APIs) is essential. Second, due to the shift towards continuous manufacturing, processing agents must be supplied continuously. Last, with regard to personalized medicine products, small doses of API have to be processed with high flexibility. In all these applications, a few grams of powder or less per hour have to be fed, which makes processing very challenging. The common route of pre-blending causes additional effort in processing and quality control compared to direct continuous feeding, while material properties influence the performance of conventional feeders with conveying screw elements. Methods In this study, a novel micro-feeding system based on active volumetric displacement is investigated and compared to commercial LIW feeders of various scales. In the micro-feeder, the powder is filled into a cylindrical cartridge and pushed towards the process by a piston in a controlled manner. Tests are carried out with a free-flowing grade of lactose and croscarmellose sodium as an example of cohesive powder. Results At feed rates of a few grams per hour, for the investigated materials, the system has at least the same performance as conventional feeders at significantly higher feed rates. Especially at low feed rates, less fluctuations are obvious and accuracy and precision of the micro-feeder are at the same level as for the established feeding technology at rates ten times higher. Conclusion For the two types of investigated materials (free-flowing and cohesive), the micro-feeding system shows similar or better performance than conventional and commercially applied LIW feeders. The technology offers the potential for highly accurate, continuous feeding in the low-dose range.

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Stable micro-feeding of fine powders using a capillary with ultrasonic vibration

Cited by 29 publications

References 17 publications

An Integrated Dual Ultrasonic Selective Powder Dispensing Platform for Three-Dimensional Printing of Multiple Material Metal/Glass Objects in Selective Laser Melting

An Integrated Dual Ultrasonic Selective Powder Dispensing Platform for Three-Dimensional Printing of Multiple Material Metal/Glass Objects in Selective Laser Melting

Acoustic‐Modulated, Selective Particle Deposition for Muti‐Material Additive Manufacturing

Comparative Study of a Novel Micro-feeder and Loss-in-weight Feeders

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