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신보성(Bo-sung Shin),박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
It is well known that abrasive waterjet (AWJ) was developed a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However AWJ have still been some difficulties to improve the quality of thin workpiece. In this paper, we investigate the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance, of thin multi-layered materials. The experimental results show that AWJ have possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
나노 다공 구조를 가진 알루미나 재료의 UV 레이저 미세가공에 관한 실험적 기초 연구
신보성(Bo-Sung Shin),이정한(Jung-Han Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
Recently UV laser is widely used to process micro parts using various materials such as polymers, metals and ceramics because it has a very high intensity at the focused spot area. It is generally known that there are still some difficulties for alumina(Al₂O₃) ceramics to directly make micro patterns like holes and lines on the surface of working material using 355nm UV laser because the alumina has a very low absorption coefficient at that wavelength. But nowadays new alumna with nano-porous holes is developed and applied to advanced micro functional parts of IT, BT and BT industries. In this paper, we are going to show the mechanism of photo-thermal ablation for nano-porous ceramics. Inside hole there is a lot of multiple reflections along the depth of hole. Experimentally we can find the micro hole drilling and micro grooving on the surface of nano-porous alumina.