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전해방전 가공 시 방전 피크의 제어를 통한 유리의 미세 가공성 향상에 관한 연구
장인배(I. B. Chang),김남혁(N. H. Kim),김대용(D. Y. Kim),김병희(B. H. Kim),김헌영(H. Y. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Electrochemical discharge machining is a very recent technique for non-conducting materials such as<br/> ceramics and glasses. ECDM is conducted in the NaOH solution and the cathode electrode is separated from<br/> the solution by H2 gas bubble. Then the discharge is appeared and the non-conductive material is removed by<br/> spark and some chemical reactions. In the ECDM technology, the H2 bubble control is the most important<br/> factor to stabilize the discharging condition. In this paper, we proposed the discharge peak monitoring/<br/> discharging duty feedback algorithms for the discharge stabilization and the feasibility of this algorithm is<br/> verified by various pattern machining in the constant preload conditions for the cathode electrode.
펨토초 레이저를 이용한 박막 재료 및 기판 변화에 따른 가공 특성에 관한 연구
김병희(B. H. Kim),신홍규(H. G. Shin),이종길(J . G. Lee),정세채(S. C. Jeong) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
We have investigated the behavior of the ultra fast laser ablation of chromium films (200㎚) on the silicon and pyrex glass(corning 7740) substrate with respect to the laser fluence and the number of laser pulses. In addition, several experiments about ITO thin film were carried out with femto- second Ti:Sapphire laser (150fs). Fin ally, we introduce the ablation characteristic in accordance with materials of thin film and substrate.
김병희(B. H. KIM),최종필(J. P. CHOI),이광호(K. H. LEE),이혜진(H. J. LEE),이낙규(N. K. LEE) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents the design of inchworm motor and guide system for high precision actuator system of large displacement and high force. The inchworm motor consist of a extending actuator that provides displacement of tool guide, and two clamping actuators which provide the holding force. PZT element has the low tensile strength and shear. Therefore, PZT stack is easy to break by the tensile and shear. In other to prevent PZT failure, the pre-load housing was designed by comparing the von-mises stresses according to the variation of the hinge stiffness. FEM was used to determine the hinge stiffness. Also the guide system is designed for the improvement of motion accuracy in the inchworm motor.