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성백주,양희선,김도식,강보식,이용범 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.4
Purpose: The CNC lathe uses a power chuck operated by a hydraulic-driven rotating cylinder to grip the lathe stably, which is especially important during high-speed milling. In this paper, we suggest the cause of power chuck failure and then verify its reliability by improving its structure of internal parts. We also perform a life test and a pre/post major performance test on a prototype aluminum chuck, analyze its shape data, and propose shape and scale parameters. Methods: We used ANSYS mechanical software to provide a structural analysis of the prototype chuck body. Constraints were set to fixed conditions below the body with a load of 20 kN equivalent applied to the cylinder thrust. The life data analysis was performed using the Minitap program. Results: The shape and scale parameters of the prototype power chuck were 2.77 and 4,706,474 cycles, respectively. Conclusion: The prototype power chuck life span was analyzed as 521,512 cycles at the lower 95% confidence limit, meaning its reliability showed higher than its warranty life.
비례압력제어밸브의 제어압력 특성 향상을 위한 설계 개선
성백주,정동수,박종원,이종배 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.4
Purpose: The control accuracy of the proportional pressure control valve is largely influenced by electromagnetic and mechanical factors, affecting the linear characteristic, the hysteresis, the pressure override characteristic, and the attractive force. In general, electromagnetic characteristics are determined by solenoid actuator and mechanical factors are determined by valve body components. These factors, which have a great influence on the control precision, are not mutually exclusive because the constituent variables are connected to each other like a link. Methods: Design values of main components constituting solenoid actuator are derived by using design equation based on electromagnetic theory and then validated through finite element analysis, the design improvements for the main components of the valve body, were performed, and the performance before and after improvement was compared through AMESim analysis. Results: The design values of the actuator were calculated through the design equations and the main design parameters of the control angle with the best attractive force characteristics were determined. We also completed design improvements for valve body to improve pressure override characteristics. Conclusion: The performance test of the main items using the prototype was conducted to verify the feasibility of the improvement and the performance characteristics were confirmed.
성백주 사단법인 유공압건설기계학회 2009 드라이브·컨트롤 Vol.6 No.4
For a design of on/off solenoid actuator for valve actuating, designer must have the experimental knowledge as well as general electromagnetic formulas to design object. It is possible for theoretical knowledge to do the out-line design, but it is impossible to optimal design without experimental knowledge which only can be achieved through many repeated experiments. In addition, in present on/off type solenoid actuator field, the smaller, lightening, lower consumption power, high response time are effected as the most important design factor. So, experimental knowledge is more needed for optimal design of solenoid actuator. In this study, we derived the governing equations for optimal design of on/off solenoid actuator for valve actuating and developed a design program composed electromagnetic theories and experimental parameter values for inexperienced designers. And we proved the propriety of this program by experiments.