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- 저자 : 김병희(B. H. Kim) (검색결과 286 건)
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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.
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김병희(B. H. KIM),전성건(S. K. JEON),남권선(K. S. NAM),김헌영(H. Y. KIM),전병희(B. H. JEON) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
Ultrasonic machining is effective for machining of extreme hard and brittle materials, including glass, ceramic, carbide, graphite. The major machining principle involves the direct hammering as well as the impact of abrasive particles on the workpiece. Also, it involve cavitation erosion. The general workpiece is flat side. This study attempted micro hole machining of a curved surface of glass tube. Ultrasonic machining is fault of the slow machining speed. An experiment does and got 16 seconds validity machining time as increasing the processing speed. Moreover, entrance crack and sur face roughness was similar both machining speed is slow and fast. Several micro hole of glass tube machined using one micro tool, but tool wear is infinitesimal.
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김병희(B. H. KIM),최종필(J. P. CHOI),이광호(K. H. LEE),이혜진(H. J. LEE),이낙규(N. K. LEE) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
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.
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김병희(B. H. KIM),남권선(K. S. NAM),최종필(J. P. CHOI),김헌영(H. Y. KIM),이낙규(N. K. LEE) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
In this paper, a new type of inchworm motion actuator is developed in fabrication of actuators for micro-press machine. This is consisted of three piezoelectric actuators, one is for moving the tool guide and the other are for clamping the guide. The inchworm motor provides both high load and large displacement in small size actuator. PZT has compressive strength and often fails under tensile stress and pulling. Thus, in order to prevent failure, we have designed pre-load housing and accomplished FEM analysis. The pre-load housing was used for determining the optimal design condition by comparing the von-mises stresses with the change of hinge stiffness. Also, in order to predict the performance of the motor under certain conditions, the system model was simulated using MATLAB. This is open loop control actuator and driven by the period of input voltage.
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