| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 90 === In recent years, IC industry in Taiwan has made great advancement. Microdrills manufacturing industry has been playing a key role. To keep up the progression pace needs not only to improve precision but also quality and life of microdrills. There are two issues in microdrills fabrication, one is the determination of grinding wheel section based on drillflute geometry, the other is quality of cutting edge. This thesis provides necessary analyses and strategies for the respective issues.
This thesis has been given into three major parts: firstly, a solution constructed by transformed mathematical mode, with MATLAB program and CATIA as tools to determine true section of grinding wheel; secondly, the previous solution is used to improve drilling efficiency by modifying drillpoint geometry; finally, study of ductile machining mode of microdrills is investigated. The experiments on brittle-ductile transition region of microdrill machining and the relations between critical cutting depth, critical material removal rate and surface quality of workpiece are conducted. The results provide an effective working range in ligh
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