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Acoustic control of powder dispensing in open tubes

Acoustic control of powder dispensing in open tubes
Acoustic control of powder dispensing in open tubes
A multiple powder metering and dispensing device has been constructed to create functionally graded materials by the solid free-forming process known as selective laser sintering. The device makes use of vertical open tubes through which the flow rate of dry powder is controlled by the characteristics of acoustic vibration in the 20–200 Hz region. Flow is initiated by high amplitude ‘attack’ waveforms and stops when vibration ceases. This simple but effective device raises many questions about the factors that cause flow arrest. The effects of tube diameter, amplitude, mechanical damping and particle size distribution are investigated. By selecting optimum parameters for a metallic powder, the overflow (discharge from the open tube after silence) was brought below 1 mg.
powder flow, solid freeforming, powder metering
0032-5910
55-60
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, Julian R.G.
4eee463a-4dd3-4ef2-b9bc-784246b68ad2
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, Julian R.G.
4eee463a-4dd3-4ef2-b9bc-784246b68ad2

Yang, Shoufeng and Evans, Julian R.G. (2004) Acoustic control of powder dispensing in open tubes. Powder Technology, 139 (1), 55-60. (doi:10.1016/j.powtec.2003.10.008).

Record type: Article

Abstract

A multiple powder metering and dispensing device has been constructed to create functionally graded materials by the solid free-forming process known as selective laser sintering. The device makes use of vertical open tubes through which the flow rate of dry powder is controlled by the characteristics of acoustic vibration in the 20–200 Hz region. Flow is initiated by high amplitude ‘attack’ waveforms and stops when vibration ceases. This simple but effective device raises many questions about the factors that cause flow arrest. The effects of tube diameter, amplitude, mechanical damping and particle size distribution are investigated. By selecting optimum parameters for a metallic powder, the overflow (discharge from the open tube after silence) was brought below 1 mg.

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More information

Published date: 5 January 2004
Keywords: powder flow, solid freeforming, powder metering
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 165087
URI: https://eprints.soton.ac.uk/id/eprint/165087
ISSN: 0032-5910
PURE UUID: d513bb06-4fe6-4c16-9dd4-639368a7c68e
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 07 Oct 2010 15:12
Last modified: 06 Jun 2018 12:33

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