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국내 라셀기의 성능향상을 위한 니들과 가이드 구동장치 가상 시제품 개발
송석,김영규,Song, Suk,Kim, Young-Gyu 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.2
We have designed a new driving mechanism of the raschel machine for industrial fabrics using the eccentric earn. Domestic raschel machines for industrial fabrics have low productivity and high level of noise and vibration because it uses the pot earn in the main driving mechanism. The goal of this research is to reduce the noise and vibration, and to enhance the productivity of the domestic raschel machine. Three dimensional modeling of the parts was carried out by using MDT (mechanical desktop), and kinematic analysis has been implemented to design the new needle driving and the guide driving mechanisms using the Visual Nastran program. To estimate the safety of the principal parts of the mechanisms, finite element analysis (FEA) has been conducted by using Visual Nastran program. As the result of FEA, the newly designed needle driving and guide driving units is estimated safe under actual driving. Consequently, we have developed a virtual prototype of the needle driving and guide driving units of the raschel machine for industrial fabrics which increase the productivity remarkably and reduce the noise and vibration. Moreover, the results show that the needle dwells for $190^{\circ}$ at the uppermost position, and the guide performs shogging operation for $160^{\circ}$. This motion has the effect of enhancing the stability of loop formation during knitting operation by speeding up the shogging motion of the guide bar of the domestic raschel machine for industrial fabrics.
정상화,송석,최석환 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
In recent days, as the efficiency of electronic home applications become higher, that of the driving AC motor become higher. On this reason, the demand for high capacity coil forming machine is increasing. Since the coil forming is not simply related with the only capacity of hydraulic cylinder, the development of a newer coil forming machine which has new forming mechanism, new driving method, new forming tool, and new specification is required. In this paper, the virtual prototype which have new mechanism is developed. This prototype is tested and experimented on PC with the same condition as actual. The results from the virtual experiment is applied to the actual design process.
초음파 여기를 이용한 물체 이송 시스템 개발에 관한 연구
정상화,신병수,차경래,송석,이경형 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
In recent years, as the semiconductor and the optical industry grows, the necessity of the transporting system for semiconductor and precision optical lens without damage increases. The transport system using ultrasonic wave is very suitable for this area. In this paper the object transport system using the excitation of ultrasonic wave is proposed. The experiments for finding the optimal excitation frequency, finding phase-difference between two ultrasonic wave generators are performed. The effect of transporting speed according to the change of weight and amplification voltage are verified. In addition, the system performance for actual use is evaluated.
NiTi 형상기억합금을 이용한 차동식 액츄에이터의 동작성능 향상을 위한 연구
정상화,김현욱,차경래,송석,신병수,이경형 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research on dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.