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함영복(Young-Bog Ham),양정순(Jeong-Soon Yang),윤소남(Sonam Yun),유찬수(Chan-Soo Ryu),김광영(Kwang-Young Kim),최병오(Byung-Oh Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Screen printing technology has very commonly used in many ways due to the low cost effectiveness to existent FPD(Flat Panel Display) device manufacturing process. It also has very useful application areas, not only paper or textile printing but patterning for PDP, TFT-LCD color filter, RFID antenna, OLED, and so on. In this study, the printing pressure of screen printer was measured and controlled by load cell and pressure control valves for improvement of printing quality. And also, the clamping pressure of screen frame was controlled by proposed an air-hydro regulator for improvement of stable printing and a stronghold fixture of screen frame. The accuracy and repeatability of screen printing were improved by there proposed additional mechanism.
함영복(Young-Bog Ham),송종진(Jong-Jin Song),조원용(Won-Yong Cho),박중호(Jung-Ho Park),윤소남(So-Nam Yun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In precision machinery systems for electronic devices, due to the generation of heat, cooling system is essentially needed. Miniaturized pumps have been demanded for cooling water circulation and a low power consumption. To obtain sufficient performance for practical applications, in this paper, a piezoelectric pump composed of hinge-lever using multilayer PZT actuator to generate large displacement and two sheet type check valves to control flow direction are designed. First, hinge-lever mechanism consists of a pin hinge-lever and two multilayer PZT actuators. The metal bellows is used as a flexible pump chamber. The hinge-lever mechanism produces a 550㎛ displacement with free load. Second, a check valve with high response is applied and the basic characteristics are experimentally investigated with various shapes and thickness. As a result, the maximum flow rate of 1.3 l/min and maximum pumping pressure of 10 ㎪ are obtained with the driving frequency of 80 ㎐ at 100 V<SUB>p-p</SUB>.
함영복(Young-Bog Ham),윤동원(Dong-Won Youn),조원용(Won-Yong Cho),박중호(Jung-Ho Park),윤소남(So-Nam Yun),안국영(Kook-Young Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Recently, piezoelectric actuator has been applied in the various fields of industry such as life science, automotive, IT and telecom. The PZT actuator is used by the reverse piezoelectric effect, which generated a mechanical displacement in the electric field. Because the displacement of this actuator is 1/1000 times of PZT element thickness or height with high voltage, this actuator has to combine with a displacement amplified mechanism. In this paper, the PZT actuator has 10 times amplified displacement using hinge-lever magnification mechanism. The free load displacement of multilayer PZT is 56㎛ at input voltage of 100Vdc, and the proposed mechanism has maximum amplified displacement of 684㎛ through the experiment. The frequency response of PZT actuator having hinge-lever mechanism is measured as resonance frequency. As a result, the resonance frequency of PZT actuator is 209.7㎐ in simulation and 204㎐ in experiment.
함영복(Young-Bog Ham),유진산(Jin-San Yoo),윤소남(So-Nam Yun),최병오(Byung-Oh Choi) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Generally, flow-direction control servo valve can be used for speed and position control of hydraulic cylinder, and pressure control servo valve can be used for force control. In this paper, the simulation of dynamic force control characteristics of linear servo actuator which is consist of flow-direction control servo valve and low fiiction hydraulic cylinder was pcrformed. The simulation results indicate that the flow-direction control valve can be used to control the force of electro-hydraulic servo actuator for the test of automobile component and structure.