| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 104 === Mirror finishing is a high precision machining method with regard to quality of workpiece surface after process. It affects by structure rigidity of machine center, machining parameters, material properties, and cutting tools, especially the cutting tools and its grinding accuracy for cutting edges.
This thesis is aimed at when using end mill machining aluminum by side milling, the workpiece surface would bring different luster on it after machining, called dark-light line, is similar to the milling mark. Therefore this study analyzed and discussed the flatness of cutting edge and width of the round bar. The cutting edge is generated by grinding rake surface and relief surface. The cutting tools keep a trace of round bar on the relief surface, so the cutting edges become generated by grinding rake surface and round bar. Therefore the grinding parameters of cutting edge are rake grain size, rake spindle rpm, rake feed rate, and rake NC step. Chipping is the major performance index of grinding process. Using factorial experiment find the optimal parameters of grinding process, then analyze and discuss the trend. The width of round bar could be control by human, so this study discusses the suitable size of the width of round bar. Using those sizes of width of round bar to machine workpieces, and analyze the result of it.
The result of grinding accuracy of cutting edges shows that the rake feed rate is the main effect factor. By applying the optimal parameters of grinding process, the accuracy of cutting edge is 1.910 micrometer. The width of round bar has to equalize width, and the value should be between 15 micrometer and 40 micrometer. Experimental results show that the proposed approach can improve the grinding accuracy for cutting edges of end mills.
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