| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 95 === Recently, many product designers of various industries, such as automobile, semiconductor, electronic parts, and mold industries tend to design products featured with complex surface. Request for the efficiency, accuracy and machining of these complex surface, it is the important way to achieve competition advantage by developing high efficiency, accuracy, and quality five-axis machining techniques. This paper attempts to develop key technology used in die machining with spherical surface by application of the CAD/CAM software and 5-axis machining center. The goal of the study is to find the optimal machining parameters for better surface finish, and thus significantly reduce time, cost, and error in further bench working. In this study, a commercial CAD/CAM Software is used to plan and generate the multi-axis tool path, and a table rotating/tilting type five-axis machining center is used to perform the experimental machining operation. The material of the die studied is NAK 80 die tool steel, and the geometries are modeled as concave and convex spherical surfaces. Milling parameters considered are spindle speed, feed rate, and different types of cutting tool path. The experimental results show that the surface roughness for concave spherical surface is about 0.247 μm and roundness is about 0.0283 mm and the surface roughness for convex spherical surface is about 0.250 μm and spherical roundness is about 0.0551 mm under the cutting conditions mentioned in this study. It is believed that the results and methods presented in the thesis give a good reference for industry.
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