"Milling is an operation, to remove undesired metal from a part, that is used in many industries, especially aerospace. Studying the operation to improve the material removal process includes studying the behavior of the tool and the workpiece during milling. In this paper, the tool and workpiece in end milling operations are analyzed as beams to study their dynamic vibrations. The tool is analyzed as a cantilever beam with one end clamped and force is applied at the other end. The workpiece is analyzed as a clamped plate. The equation to analyze the workpiece with both ends clamped is combined with the equation system of the tool. Solving this combined equation system yields more satisfactory results as compared with the equation considering the tool only.
A method to select spindle speed and the axial depth of cut to reduce vibrations in end milling is presented. Natural frequencies of the workpiece are obtained from SDRC I-DEAS. Combining the transfer functions of the structure at the cutter-workpiece contact zone, static cutting force coefficients, number of teeth of the cutter, and radial immersion, the stability model is constructed. The chatter free axial depth of cut and spindle speed are calculated from the set of linear analytic expressions.
Various stability charts are constructed, based on the experiments that were performed on one particular CNC milling machine. These charts show the safety regions to remove metal at different spindle speeds. When compared with analytical methods, this method yields exceptional results"--Abstract, page iii.
Liou, Frank W.
Le, Vy Khoi
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
National Science Foundation (U.S.)
University of Missouri--Rolla
x, 59 pages
© 2002 Chau Nguyen, All rights reserved.
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b4824444~S5
Nguyen, Chau, "High-speed machining of thin-walled structures" (2002). Masters Theses. 2149.
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