Keywords and Phrases
Additive Manufacturing; Direct Metal Deposition; Disk feeder; Performance metric; Powder feeder
"In blown powder Direct Metal Deposition (DMD) process, parts are built by adding metal powder on the melt pool created by the laser system. At low feed rates powder feeder systems have perturbations. The study focused on relationship between the perturbation frequencies by inherent powder feeder designs and its impact on deposition quality. Performance metric determine the relation between perturbations in the powder flow and quality of the deposit. To determine performance metric, various powder feeder designs were analyzed. Perturbation frequencies were introduced to the disk feeder design. The quality of the deposit was determined by the surface roughness of the deposit. A laser displacement sensor was used to measure the surface roughness of the deposits. Experiments were carried out to determine the significance between measured surface roughness values of the deposits over theoretically calculated performance metric values. Validation tests were done to compare the data fit. The wheel feeder and newly developed disk feeder were compared for deposit quality. The results showed better performance metric for the disk feeder system under the same process parameters. Based on this metric, a feeder system can be chosen in the future to produce Functionally Graded Materials (FGM)"--Abstract, page iii.
Liou, Frank W.
Newkirk, Joseph William
Materials Science and Engineering
M.S. in Manufacturing Engineering
Missouri University of Science and Technology. Department of Manufacturing Engineering
Missouri University of Science and Technology
ix, 35 pages
© 2015 Venkata Sivaram Bitragunta, All rights reserved.
Thesis - Open Access
Manufacturing processes -- Research
Pulsed laser deposition
Electronic OCLC #
Bitragunta, Venkata Sivaram, "Performance metrics for powder feeder systems in additive manufacturing" (2015). Masters Theses. 7461.