• 한국정밀공학회지
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• 제18권1호
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• pp.9-11
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• 2001

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 추계학술대회 논문집
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• pp.43-44
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• 2007

• Journal of Mechanical Science and Technology
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• 제19권4호
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• pp.968-975
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• 2005

The shearing process for the sheet metal is normally used in the precision elements such as semi-conductor components. In these precision elements, the burr formation brings a bad effect on the system assembly and demands the additional de-burring process, so this imposes high cost on manufacturing. In this paper, we have developed the in-situ auto-aligning precision meso-punching system to investigate the burr formation mechanism and ultimately minimize burr. Firstly, we introduced the punch-die contact sensing method to align the punch and the die at initial state prior to the punching process. Secondly, by using the low-price semi-con­ductor laser, burr formed on the edges is measured intermittently during the punching process. We could, finally, make burr on the sheet metal uniformized and minimized by controlling of the precision X - Y table, $1\;{\mu}m$ resolution, and measuring burr height by semiconductor laser. Experimental results show the validity of our system for pursuing the burr-free punched elements.

• 기술혁신학회지
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• 제6권4호
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• pp.429-446
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• 2003

The status of microfactory or microfactory-related research in some advanced countries are investigated. Under the financial support of government, Japan has accomplished the Microfactory Project, the United States has pursued the Micro/Meso mMf project, and European countries have been studying micro assembly systems. In Korea, several universities and some large manufacturers have participated in the development of micro-components or micrcrdevices based on MEMS technology since the late 1990's. Microfactory is a process which achieves an integrated micro-manufacturing system in a production system, which is followed by the steps of micro-technology of machine parts based on micro-system technology. In addition, this process is a new concept of manufacturing system that renovates the existing manufacturing system It is sure that the research of micro- manufacturing technology must lead to nano-technology in the near future, with intensive financial supports of government for this technology.

• 소성∙가공
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• 제15권3호
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• pp.247-254
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• 2006

Rather than traditional manufacturing processes, miniature manufacturing processes usually require sophisticated equipments and characteristics of the processes of high cost and of low productivity. Contrarily, miniature stamping process can be realized in a low cost high productivity with relatively inexpensive equipments. In the meso scale, mechanical properties, especially work hardening characteristics, are discovered to be statically scattered and size dependent by intensive experimental and numerical investigations, which make the stamping process hard to apply to the miniature manufacturing. In this study, dual purpose experimental device that can be used for both miniature scale tensile test and miniature scale stamping by simple change of attachment has been developed. For the tensile test, the elongation has been measured with a combined use of a CCD camera and a linear encoder in order to account for the possibility of slippage between specimen and the grip and to ensure the accuracy of the measurement, while load has been measured with a load cell. To satisfy the required material properties for stamping, optimal annealing condition has been found by examining the microstructure of annealed specimen.

• Korean Chemical Engineering Research
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• 제47권3호
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• pp.368-372
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• 2009

흡착제의 흡착특성인 흡착표면적과 세공크기를 수정진동자를 이용하여 측정하는 방법을 제안하고 그 성능을 조사하였다. 액체질소를 활용하는 기존의 방법에 비해 상온에서 이산화탄소를 이용하기 때문에 장치가 소형이고, 조작이 간편하며 짧은 흡착시간 내 측정이 가능한 이점을 가지고 있다. 마이크로 입자의 카본 크라오젤과 대나무 활성탄에 대해 흡착특성을 측정한 측정치를 흡착능 측정기로 측정한 측정치와 비교한 결과 메조세공의 흡착제에 대해서는 유효한 측정치가 얻어진 반면 마이크로 세공의 입자에서는 다소 큰 오차를 나타내었다.

• 한국생산제조학회지
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• 제19권3호
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• pp.334-339
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• 2010

The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.