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이동길(D.G. Lee),장경천(K.C. Jang),정민관(M.G. Jung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The influence of Niobium(Nb) contents and aging conditions on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft, space field, nuclear energy, and vehicle etc. were investigated. The yield strength was the highest about 1,800MPa in 0.06%Nb specimen having twice as much as the base metal specimen. Also, the elongation was the highest in 0.03%Nb specimen showing the same as base metal specimen. The higher aging temperature and the longer aging time, the fatigue life increased. On the other hand, the 0.03%Nb specimen showed the highest fatigue life which increased about 12% more than base metal specimen. 0.06% Nb specimen aged at 482℃ for 8 hours simultaneously satisfied the 250 grade strength and 200 grade elongation having the most superior mechanical properties.
이동길(D.G. Lee),장경천(K.C. Jang),정민관(M.G. Jung),김명호(M.H. Kim),김일수(I.S. Kim) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
MIM(Metal Injection Molding) that is a kind of PIM(Powder Injection Molding) is using in optical communication field, display field, several fields such as semi-conductor field because ceramic has superior physical properties. Also, mold's optimization that can produce high precision flange that is one of main parts of optical communication field is greatly required. The objective of this paper is to study the suitability of design and capability analysis for the MIM and process that can mass-produce the flange using in a mold by conduct the experiments as well as the flow analysis. It was filling time 0.5~1.5 second, injection pressure 11.0~12.5 ㎫ range for the injection parameters that cause high effect to injection derived from optimum condition by flow analysis. Yield that is more than gravity 7.495 that establish by target as result that analyze gravity of products at investigated injection conditions was 99.01 % and process capability was construed by 3.83 sigma level. Also, the average gravity and standard deviation was 7.6151 and 0.0511 respectively. The measured dimensions were all good results within the established target showing that concentricity, roundness, and density were 27.43 ㎛, 18.64, and 97.63%.