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이택민(T.M.Lee),김동수(D.S.Kim),조정대(J.D.Jo),양정순(J.S.Yang),강태구(T.G.Kang),김광영(K.Y.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, we present a design, fabrication and performance test of the novel DoD metal-jet injector for application to the high-density and high-temperature-melting materials. We design the gap adjustable DoD injector for controlling the size, speed and direction of the ejected metal droplets. The effect of design parameters on droplet size was analyzed. Fabricated gap adjustable injector ejects the D.I. water microdroplets whose measured volume is 7.23nl with the 4.8m/sec velocity through the 50㎛-diameter nozzle. Also the injector print the metal microdots, whose diameter is about 600㎛, on the glass at the chamber temperature of 200℃. Consequently, present novel metal-jet injector has a potential to applications for the fabrication of the low-cost fabrication of the electronic devices.
김동수(D. S. KIM),박상운(S. W. Park),김현섭(H. S. KIM),류재섭(J. S. YOO),이원희(W. H. LEE) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, A special quality analysis and experiment for low power consumption type pneumatic on-off micro valve was performed. And flow characteristics of the micro valve by stroke change was numerically investigated. As a result, it is shown that magnetic force(2.4N) is exerted enough to move poppet with 0.3mm stroke with 0.01 seconds of response time, and that there is no magnetic force emitted by yoke. Under the condition of poppet stroke smaller than about 0.8mm, dynamic pressure acts to poppet wall up to supply pressure level. But, that is decreasing to 40% when poppet stroke is 0.8mm.