Masters Theses

Yu-Herng Pan

Abstract

"Laser Metal Deposition (LMD) has been used to not only make but also repair damaged parts in a layer-by-layer fashion. Parts made in this manner may produce less waste than those made through conventional machining processes. However, a common issue of LMD involves controlling the deposition's layer thickness. Accuracy is important, and as it increases, both the time required to produce the part and the material wasted during the material removal process (e.g., milling, lathe) decrease. The deposition rate is affected by multiple parameters, such as the powder feed rate, laser input power, axis feed rate, material type, and part design, the values of each of which may change during the LMD process. Using a mathematical model to build a generic equation that predicts the deposition's layer thickness is difficult due to these complex parameters. In this thesis, we propose a simple method that utilizes a single device. This device uses a pyrometer to monitor the current build height, thereby allowing the layer thickness to be controlled during the LMD process. This method also helps the LMD system to build parts even with complex parameters and to increase material efficiency"--Abstract, page iii.

Advisor(s)

Liou, Frank W.

Committee Member(s)

Kinzel, Edward C.
Newkirk, Joseph William

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Manufacturing Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2013

Pagination

x, 57 pages

Note about bibliography

Includes bibliographical references (pages 136-140).

Rights

© 2013 Yu-Herng Pan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Manufacturing processesPulsed laser depositionPowder metallurgyFeedback control systems

Thesis Number

T 10411

Electronic OCLC #

870650578

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Included in

Manufacturing Commons

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