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김정언,홍석관,김종덕,허영무,조종두,강정진,Kim, Jeong-Eon,Hong, Seok-Kwan,Kim, Jong-Deok,Heo, Young-Moo,Cho, Chong-Du,Kang, Jeong-Jin 한국금형공학회 2008 한국금형공학회지 Vol.2 No.4
In the sheet metal forming using a high speed press machine, driving device, such as crank, link, and knuckle mechanism, has to be designed in consideration of impact at a moment when press die contact with material, because the impact affects a dimensional accuracy of products and a life span of press die. In this study, dynamic analysis was performed using numerical simulation in order to verify the impact reduction effect for proposed double knuckle mechanism by estimating rolling and pitching moment of slide.
금속도금공장 폐수중의 구리 및 시안화물의 효과적인 처리방법
諸元穆,洪鍾斗,金冕燮 漢陽大學校 環境科學硏究所 1988 環境科學論文集 Vol.9 No.-
구리 및 시안화물이 혼합된 도금폐수를 적절하게 처리하는 방법을 알기 위하여 pH,농도 및 접촉시간에 따르는 용액중 구리 및 시안화물의 제거율을 실험하였다. 그 결과 시안화물은 5% NaOC1용액으로 처리하면 잔류시안 농도가 0.03 ㎎/ℓ이하로 환경배출기준에 적합하였다. pH에 따르는 영향은 pH8 이상에서 99%제거율을 나타냈다. 구리혼합용액은 중화침전법으로 실험한 결과 pH8에서 99%가 짧은 시간에 제거되었다. 시안화물과 구리혼합용액의 pH에 따르는 제거율은 pH8 및 11에서 높은 제거율(95%이상)을 보였으며 pH10에서 제거율이 떨어지는 결과를 얻었다. To investigate the effective removal method of copper and cyanide compounds in metal plating waste water, removal ratio of copper and cyanide compounds in solution are measured with varying pH, concentration and contact time. As results of the present expriment, cyanide compounds in the solution are removed to 0.03 ㎎/ℓ or less with 5% NaOC1 solution. The present result is satisfied to environmental disposal standards. The removal ratio against pH values show 99% over pH8. As results of neutral precipitation method, copper including solution are removed to 99% at pH8 in short time. The removal ratios of cyanide mixed copper solution against pH values show high efficiency(over 95%) at pH8 and 11 and removal ratios are decreased at pH10.
강정진(J. J. Kang),김정언(J. E. Kim),홍석관(S. K. Hong),김종덕(J. D. Kim),허영무(Y. M. Heo),조종두(C. Cho) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Ultra-thin sheet metal forming techniques are required in precision forming of miniaturized and integrated products. In order to manufacture a good quality and low cost ultra-thin sheet metal products, a highly precise high-speed press is needed. The precision of a press is related with its vibration characteristics during pressing operation. This study evaluated the vibration characteristics of a proposed press design using computer simulation. The analysis compares the static deformation characteristics of the slide and the slide motion for the metal forming of an ultra-thin sheet of thickness less than 0.1mm. Further, in order to minimize the vibrations during high speed pressing operation, revolution balances of the eccentric shaft and the balance weight device is also considered. Finally, modal analysis is used to characterize the natural frequency of vibration of the press.