| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 92 === Deflection of cutter occurred during machining process introduces errors to the machined workpiece. Cutting vibration due to Low stiffness of cutter will also deteriorate the surface roughness of the workpiece. Factors, such as diameter, number of flutes, and cutter length, influence the static/dynamic stiffness of a cutter. In this study, mathematical model of moment of inertia for end mills was developed to explore the relationship between cutter stiffness and cutter length. The analysis based on the developed model can provide the information for users to decide the allowed maximum cutter length for precise machining. In addition, because different cutter lengths give a cutter varying static/dynamic stiffness that can influence the occurrence of cutting vibration to affect the machined surface roughness, the influence of cutter length to surface roughness with different machining parameters were also studied in this thesis. To verify the simulated phenomenon, several cutting experiments in which different clamping cutter lengths incorporated with different machining parameters for the comparison of machining accuracy were conducted.
Keywords：End Milling、Deflection、Surface Roughness
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