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데스크탑 마이크로 성형시스템의 가진성형에 따른 동특성 연구
홍동표,고유곤,홍용,김현식,이재완 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
In this study, a desktop forming system which enables hydro dynamic bearing forming was developed. It consists of power train system, frequency forming system, manufactured Die-set, and controller of desktop forming system. The desktop micro forming system is focused on a higher load capacity and a shorter forming time than conventional system. Therefore it was designed for power train capability and load condition of Ball Screw. Moreover, a Piezo actuator was installed to make accurate machining possible, however, the Piezo actuator generate noise and vibration. Thus we performed the analysis of dynamic characteristics through the experiment about developed system in order to reduce such problems and discuss the alternative methods.
홍용,김현식,고유곤,홍동표,김성욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
In this paper, gear system for Micro-press actuator parts is developed. The micro-press system consists of AC geared servo motor, gear system and high precision ball screw. Herein, the micro-press gear system not only forms the micro thin foil valve but also forms the hydro dynamic bearing for a high precision rotational equipment, we analyzed the transmitted power capacity of gear system and torque, angular velocity of ball screw, because we are to select the appropriate servo motor and then we apply result of analysis to the micro press system. For the next step, we plan to study for the development of forming speed for a productivity with high precision.
홍용,김현식,고유곤,홍동표,김성욱 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In this paper, gear system for Micro-press actuator parts is developed. The micro-press system consists of AC geared servo motor, gear system and high precision ball screw. Herein, the micro-press gear system not only forms the micro thin foil valve but also forms the hydro dynamic bearing for a high precision rotational equipment. we analyzed the transmitted power capacity of gear system and torque, angular velocity of ball screw, because we are to select the appropriate servo motor and then we apply result of analysis to the micro press system. For the next step, we plan to study for the development of forming speed for a productivity with high precision.
탄소섬유 프리프레그 외부 표면 적층방법에 따른 하이브리드 샤프트 진동특성
홍동표,김현식,홍용,고유곤,유청환 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Studies on carbon fiber epoxy composite is being conducted broadly in industries because of its specific stiffness, specific strength and good fatigue resistance. Because carbon fiber epoxy composite has high vibration characteristics, if existing metal material is alternated by carbon fiber epoxy composite, structure will be low weight, satisfy 1st bending natural frequency and have high fatigue resistance. In this study, research on to manufacture hybrid propeller-shaft using carbon fiber epoxy composite instead of current steel propeller shaft of rear wheel drive vehicle. For this, change of 1st bending natural frequency by the number of layers of carbon fiber epoxy composite on the outer surface of aluminum shaft was observed. Compared the change of 1st bending natural frequency by FEA with computer simulation and vibration test. Through this, the amount of increase in 1st bending natural frequency of hybrid shaft by the increase in number of layers of carbon fiber epoxy composite and high vibration characteristics of hybrid shaft was acknowledged.