| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === Laser machining has always been one of the mainstream manufacturing techniques with the advantages of noncontact process and high machining precision. By shortening the time duration, the degree of precision in laser machining could be higher than ever before. Femtosecond laser machining（fs = 10-15 s）,which is getting more attention in removing materials by photolysis process, excels other techniques for its high machining precision, minimal burrs, negligible heat-affected-zone, and the feasibility for machining on any engineering materials. Femtosecond laser machining is also promising for its ability to nanomachining the size which is smaller than the light wavelength for the potential optical applications. However, femtosecond laser is still not widely adopted in industry as its system cost is high and its machining characteristics have not been fully studied.
The main theme of this thesis is to quantify machining precision of femtosecond laser machining by multi-pulse (50~3000) laser irradiation of the common industrial materials SUS 304 stainless steel and polymethylmethacrylate (PMMA). Often major focuses include a qualitative discussion of the relation between machining parameters and its microstructures. Meanwhile, a machining principle and material removing mechanism is resulted in this study, and its machining characteristics and advantages were clearly demonstrated. It is found to be useful and beneficial for the precision manufacturers as a result of development and application of femtosecond laser machining.
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