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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.
김현섭(H. S. Kim),이택민(T. M. Lee),김동수(D. S. Kim),최병오(B. O. Choi),김광영(K. Y. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The structures of airplane consist of sheet metal part, heavy machined part, and so on, which generate enormous amounts of cutting chip when these parts are machined. The cutting chip detoriorates the part quality and production efficiency. Therefore, cutting chip collecting apparatus is necessary for better quality and efficiency. In this study, blowing type cutting chip collecting apparatus was newly proposed and the concept design of the apparatus was examined through numerical analysis. Computations using the mass-averaged implicit 2D Navier-Stokes equations are applied to predict the nozzle flow field. The standard k-e turbulent model are employed to close the governing equations. Consequently, this study shows that the suggested blowing type cutting chip collecting apparatus can be alternative to existing expensive chip collecting apparatus.
3DP 공정을 이용한 오피스용 임의형상 제작시스템(SFFS)에 관한 연구
이원희(W. H. Lee),김동수(D. S. Kim),이택민(T. M. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
SFF(solid freeform fabrication) is another name of RP(rapid prototyping). The SFFS for office type wishes to develop system that can produce small object such as hand phone, cup, accessory etc. with high speed, and also intend suitable system in office environment by compact design, and buy easily by inexpensive price. As can manufacture high speed in existent SFF process technology, representative process that have competitive power in price is 3DP (three dimensional printing) technology. The 3DP technology is way to have general two dimensional printing technology and prints to three dimension, is technology that make three-dimensional solid freeform that want binder doing jetting selectively on powder through printer head. We designed and manufactured SFFS for office based on 3DP process technology design and manufactured, and composed head system so that use 3 printer heads at the same time to improve the fabrication speed of system. We used printer head of INCJET company and cartridge used HP45 series model who can buy easily in general city. And we directly fabricated three dimensional solid freeform using developed SFFS for office type.