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임성곤(S. G. Lim),강신우(S. W. Kang),박건형(G. H. Park),김성환(S. H. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The forging of magnesium is restricted to a few industries that aerospace parts. As increasing interests in the environment and enforcing strong regulations on exhaust gases and carbon dioxide in developed countries, efforts into developments in magnesium forging techniques have been making more briskly with transportation machine maker as the center. In particular, growing demands for a fuel-efficient vehicle, various efforts into lightweight of parts are putting forth. In this work, high strength commercial AZ80 and ZK60 Magnesium Alloys were forged in order to observe the changes in characteristics to the process. Changing variable forging temperature and forging speed of magnesium feedstock, magnesium control arms for chassis component were manufactured. Carrying out different heat treatments (T4 and T6), the changes in characteristics were investigated.
마그네타이트 磁性流體를 이용한 기름밀봉 장치 개발에 관한연구
강신우(S. W. Kang),김영삼(Y. S. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.4
This paper describes the fabrication of the hydrophilic magnetic fluid with high viscosity and its application to oil seal apparatus used with the Nd-permanent magnet. The results are as follows.<br/> 1) The ultrafine magnetite particles under the size of 100 Å are first coated by the oleic acid ion and again adsorbed by the hydrophilic D. B. S. ion, and there by hydrophilic magnetic fluid with high viscosity could be made by dispersing them into the ethylene glycol.<br/> 2) In development of the oil seal apparatus using magnetic fluid and Nd-permanent magnet, the viscosity and magnetic susceptibility show high when the Fe₃O₄ content is over 50% (g / cc) in the fluid, so that such properties could improve highly the capability of oil seal.<br/> 3) The maximum of the resisting pressure of the oil seal using the ethylene glycol base magnetic fluid and the Nd-permanent magnet, is about 50 g / ㎠, under the condition of this experiment. Therefore the oil seal may not be suitable for the ship engine and the driving part of the automobile, and thus it needs a lot further complementary reserch. However, it is quite favourable for such an oil seal apparatus as speed reducer under the condition of atmospheric pressure.
철계 자성유체를 이용한 기름 밀봉장치 개발에 관한 연구
강신우(S. W. Kang),김영삼(Y. S. Kim) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.2
This paper describes a fabrication of Fe-dispersed hydrophilic magnetic fluid and its application to oil seal in combination with the Nd-permanent magnet. The results are as follows; 1) Using silica coated iron particle of magnetization of 125.5 emu/g (at 10 kOe) and the mean particle size of 100 Å, after multiple adsorption to the surface of silica coated iron particle with oleic acid ion, D.B.S. and T.M.A. ion, hydrophilic Fe-magnetic fluid [70 % (g/∝)Fe, magnetization of 52 emu/g and viscosity of 1450 cp] can be produced by dispersing the iron particle in ethylene glycol solution. 2) The oil seal apparatus consisting of six stages of Nd-permanent magnet (3200 Gauss) and Fe-magnetic fluid [70 %(g/∝) Fe] showed an excellent pressure resistance of 7400 g/㎠ under the gap between shaft and oil seal was 0.2 ㎜.