Access the full text.
Sign up today, get DeepDyve free for 14 days.
D. Hu, R. Kovacevic (2003)
Sensing, modeling and control for laser-based additive manufacturingInternational Journal of Machine Tools & Manufacture, 43
JiChang Liu, Lijun Li (2004)
In-time motion adjustment in laser cladding manufacturing process for improving dimensional accuracy and surface finish of the formed partOptics and Laser Technology, 36
Xinhua Wu, J. Mei (2003)
Near net shape manufacturing of components using direct laser fabrication technologyJournal of Materials Processing Technology, 135
Gary Lewisa, E. Schlienger (2000)
Practical considerations and capabilities for laser assisted direct metal depositionMaterials & Design, 21
JiChang Liu, Lijun Li (2007)
Effects of process variables on laser direct formation of thin wallOptics and Laser Technology, 39
JiChang Liu, Lijun Li (2005)
Effects of powder concentration distribution on fabrication of thin-wall parts in coaxial laser claddingOptics and Laser Technology, 37
J. Mazumder, D. Dutta, N. Kikuchi, Amit Ghosh (2000)
Closed loop direct metal deposition : art to partOptics and Lasers in Engineering, 34
M. Griffith, M. Schlienger, L. Harwell, M. Oliver, M. Baldwin, M. Ensz, M. Essien, J. Brooks, C. Robino, J. Smugeresky, W. Hofmeister, M. Wert, D. Nelson (1999)
Understanding thermal behavior in the LENS processMaterials & Design, 20
A. Pinkerton, Lin Li (2004)
The significance of deposition point standoff variations in multiple-layer coaxial laser cladding (coaxial cladding standoff effects)International Journal of Machine Tools & Manufacture, 44
G. Bi, A. Gasser, K. Wissenbach, A. Drenker, R. Poprawe (2006)
Characterization of the process control for the direct laser metallic powder depositionSurface & Coatings Technology, 201
Purpose – The purpose of this paper is to investigate the influencing rule of the standoff distance variations between the nozzle outlet and the powder deposition point on forming dimensional accuracy. Design/methodology/approach – The thin‐wall parts were built with three different standoff distances: 1 mm more than the powder focus length, equal to the powder focus length and 1 mm less than the powder focus length. Based on the experimental results, the steady standoff distance can be acquired and the difference between the building height and the ideal height of thin‐wall parts can be compensated automatically in several layers by theoretical calculation. Findings – The experimental results show that the top surface unevenness of thin‐wall parts can be compensated automatically on the consequent successive layers when the standoff distance is less than the powder focal length from the nozzle outlet to the powder focal point, and the poorer results are obtained when the standoff distance is equal to or more than the powder focal length in the deposition of stainless steel 316L under open‐loop control. Practical implications – The shape of parts affects the self‐regulation effect in practical applications, so the self‐regulation effect is useful when the single contour of parts is continuous straight faces and the surface of parts is perpendicular to the build platform, and will be useless for parts with holes. Originality/value – According to the requirements under different process conditions in practical applications, one should first find out the relationship between the standoff distance and the building height of single‐trace cladding layer, and then use regression algorithm to obtain the stable standoff distance by simple theoretical calculation. The uniform building height, layer thickness and smooth surface can be obtained at the stable standoff distance under open‐loop control.
Rapid Prototyping Journal – Emerald Publishing
Published: Mar 8, 2011
Keywords: Metals; Powders; Formed materials
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.