Direct laser deposition is a solid freeform fabrication process that is capable of producing fully dense components with full structural integrity and is greatly enhanced by the use of an omnidirectional coaxial powder nozzle to supply the build material. In order to optimize the technique, accurate control of the two critical operational parameters of material feed rate and incident laser power intensity is necessary. Both parameters are affected by the axial powder stream concentration between the nozzle and the deposition point. In this work, a mathematical model for the powder concentration distribution is developed and the results from it compared with an experimental investigation using optical and image analysis techniques. The two show good agreement. The application of the model to the evaluation of nozzle geometry and the calculation of laser beam attenuation are demonstrated.
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February 2004
Technical Papers
Modelling Powder Concentration Distribution From a Coaxial Deposition Nozzle for Laser-Based Rapid Tooling
Andrew J. Pinkerton,
e-mail: a.pinkerton@umist.ac.uk
Andrew J. Pinkerton
Laser Processing Research Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, UMIST, Manchester M60 1QD, United Kingdom
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Lin Li
Lin Li
Laser Processing Research Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, UMIST, Manchester M60 1QD, United Kingdom
Search for other works by this author on:
Andrew J. Pinkerton
Laser Processing Research Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, UMIST, Manchester M60 1QD, United Kingdom
e-mail: a.pinkerton@umist.ac.uk
Lin Li
Laser Processing Research Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, UMIST, Manchester M60 1QD, United Kingdom
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received June 2003. Associate Editor: Y. Lawrence Yao
J. Manuf. Sci. Eng. Feb 2004, 126(1): 33-41 (9 pages)
Published Online: March 18, 2004
Article history
Received:
June 1, 2003
Online:
March 18, 2004
Citation
Pinkerton, A. J., and Li , L. (March 18, 2004). "Modelling Powder Concentration Distribution From a Coaxial Deposition Nozzle for Laser-Based Rapid Tooling ." ASME. J. Manuf. Sci. Eng. February 2004; 126(1): 33–41. https://doi.org/10.1115/1.1643748
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