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Ni-Co 합금강의 기계적 특성에 대한 탄소함량의 영향
장경천(K.C. Jang),국중민(J.M. Kuk),정장만(J.M. Jung),권택용(T.Y. Kwon),최병기(B.K. Choi) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
This study was to evaluate the effect of carbon content on metallic change and fatigue characteristics with Fe-29%Ni-17%Co, low heat expansion alloy, widely using electronic components, precision machines, and sealing with glass and metal etc. The steels were fabricated with variation of carbon content, 0, 0.03, 0.06, 0.1, and 0.20% with VIM and tensile test and fatigue test were performed to achieve the above purpose. The more carbon content, the higher hardness value and yield strength. But elongation of 0.03%C, 0.06%C, and 0.10%C specimen decreased about 2.2%, 1.5% and 0.8% respectively more than that of the base metal. Especially the strength and elongation of 0.20%C specimen increased simultaneously about 14.4% and 7.5%. Fatigue life of 0.03%C specimen decreased but the more carbon content, the higher fatigue life over 0.06% carbon content more than that of base metal.
다품종 슬리브 양산을 위한 복합금형 제작기술개발에 관한 연구
장경천(K.C. Jang),이동길(D.G. Lee),김기풍(K.P. Kim),정민관(M.G. Jung),최병기(B.K. Choi) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.10
The objective of this paper is to study the suitability of design and capability analysis for the multi-type CIM(Ceramic Injection Molding) that can mass-produce three-type sleeves using in a mold by conduct the experiments as well as the flow analysis. 11 minutes and 40 seconds that was about 29% of general exchange way was required to exchange 8-cavity cores and center pins on the average, and the accuracy dispersion was only ±6㎛. Therefore the mold design and manufacturing was very excellent for multi-type sleeve produce in large quantities. Yield that is more than gravity 6.0 that establish by target as result that analyze gravity of products at investigated injection conditions was each 97.88%, 92.65%, 90.32% from 8SC-OLC-OSC/LC, 6SC-ILC-ISC/LC and 4SC-2LC-2SC/LC cavity combination. The measured results of the SC, LC, and SC/LC sleeve products showed 5.46㎛, 11.41㎛, and 13.05㎛ on concentricity and 3.43㎛, 6.74㎛, and 4.16㎛ on roundness respectively.
CIM 탈지공정 중 오염방지를 위한 필터 및 연소장치 제작 연구
장경천(K.C. Jang),이동길(D.G. Lee),김명호(M.H. Kim),정민관(M.G. Jung) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
본 연구는 일반적인 현장에서 CIM(Ceramic Injection Molding)을 위하여 혼합된 P, EVA, CB 등의 바인더가 탈지공정에서 대기 중으로 방출되는 배기가스로 인하여, 작업공간의 오염 및 작업자에게 유해하며 환경오염이 발생되는 문제점을 해소 하고자 탈지로의 흡/배기구에 필터장치 및 2차 연소장치를 고안하여 제작하도록 하였다. 또한 사출이 완료된 사출성형체는 탈지로에서 탈지공정을 거쳐 성형체가 되고 이를 소결로에서 소결을 실시 후 검사하면 외관상에 흑점이 약 6%정도 발생되고 흑점 발생분에 대해서는 전량 폐기를 하고 있는 실정이다. 이러한 오염에 대한 근본적인 원인을 분석한 결과 갈색과 청색상의 결함부는 금속계 불순물과 Zr계 산화물에 의한 오염으로 조사되었으며, 이와같은 문제 해결을 위해 선정한 필터링 시스템은 Mesh 0.3 ㎛의 HEPA Filter를 시용한 시스템을 설계 및 제작하였다. 연소시스템을 설치하여 가동을 수차례 실시한 결과 기존에 발생되던 그을음 및 악취는 전혀 발생되지 않았으며, HEPA Filter(mesh 0.3 ㎛)를 이용한 필터시스템을 설치한 후 불량률은 평균 1.980%로서 개선전 대비 4.316% 오염에 의한 불량률이 감소되어 매우 효율적인 결과를 나타내었다.
CIM 탈지공정 중 오염방지를 위한 필터 및 연소장치 제작 연구
장경천(K.C. Jang),이동길(D.G. Lee),김명호(M.H. Kim),정민관(M.G. Jung) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
본 연구는 일반적인 현장에서 CIM(Ceramic Injection Molding)을 위하여 혼합된 P, EVA, CB 등의 바인더가 탈지공정에서 대기 중으로 방출되는 배기가스로 인하여, 작업공간의 오염 및 작업자에게 유해하며 환경오염이 발생되는 문제점을 해소 하고자 탈지로의 흡/배기구에 필터장치 및 2차 연소장치를 고안하여 제작하도록 하였다. 또한 사출이 완료된 사출성형체는 탈지로에서 탈지공정을 거쳐 성형체가 되고 이를 소결로에서 소결을 실시 후 검사하면 외관상에 흑점이 약 6%정도 발생되고 흑점 발생분에 대해서는 전량 폐기를 하고 있는 실정이다. 이러한 오염에 대한 근본적인 원인을 분석한 결과 갈색과 청색상의 결함부는 금속계 불순물과 Zr계 산화물에 의한 오염으로 조사되었으며, 이와같은 문제 해결을 위해 선정한 필터링 시스템은 Mesh 0.3 ㎛의 HEPA Filter를 시용한 시스템을 설계 및 제작하였다. 연소시스템을 설치하여 가동을 수차례 실시한 결과 기존에 발생되던 그을음 및 악취는 전혀 발생되지 않았으며, HEPA Filter(mesh 0.3 ㎛)를 이용한 필터시스템을 설치한 후 불량률은 평균 1.980%로서 개선전 대비 4.316% 오염에 의한 불량률이 감소되어 매우 효율적인 결과를 나타내었다.
성형 롤러를 사용한 Support 자동 복원 장치 개발에 관한 연구
장경천(K.C. Jang),이동길(D.G. Lee),장훈(H. Jang) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
The objective of this work is to manufacture an auto reforming system of the skirt to reduce a great financial loss, danger at a works, intensity of work, environmental pollution, and so on. The LPG container was generally designed and manufactured having over 20 year life time. But skirt, circular shape part to keep standing of LPG container, is easy to damage during transportation because of carelessness and its weight. The system consists of input and output part, hydraulic generation part, operation part, and controller. And it had some special functions of feedback control system, machine stop, and alarm to prepare for the emergencies or abnormalities. The manufactured device was useful to enhance operation efficiency, improve of working environment, and save resources showed that the skirt was restored to the former state about over 95% without any risk, smog, and mist generation and the elapsed time for one cycle took about two minutes and occurred nose was below 59.8㏈.
200 Grade 마르에이징강의 기계적성질 향상을 위한 연구
장경천(K.C. Jang),국중민(J.M. Kuk),이동길(D.G. Lee),최병기(B.K. Choi) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.10
Hardness value decreased about 3% for annealed specimens and increased about 60% for one hour aged specimens. But the values of the other specimens aged two hours or more showed almost the sane. The yield strength was the highest about 1,800㎫ 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 titre, the higher fatigue life. 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 an grade elongation having the most superior mechanical properties.
장경천(K.C. Jang),국중민(J.M. Kuk),최병희(B.H. Choi),정재강(J.K. Chung),최병기(B.K. Choi) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
Effects of Nb(Niobium) contents and solution annealing on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft, space field, nuclear energy, and vehicle etc. were investigated. Also the fatigue life stress intensity factor were compared experiment result and FEA(finite element analysis) result. The more Nb content, the higher or the lower fatigue life on base metal specimens or solution annealed specimens showing that the fatigue life was almost the same. The maximum stresses of X, Y, and Z axis direction showed about 2.12×10²㎫, 4.40×10²㎫ and 1.32×10²㎫ respectively. The Y direction stress showed the highest because of the same direction as the loading direction. The fatigue lives showed about 7% lower FEA result than experiment result showing almost invariable error every analyzed cycle. Stress intensity factor of the FEA result was lower about 3.5~10% than that of the experiment result showing that the longer fatigue crack length, the higher error. It considered that the cause for the difference was the modeled crack tip having always the same shape and condition regardless of the crack growth.
장경천(K.C. Jang),이동길(D.G. Lee),정민관(M.G. Jung),김명호(M.H. Kim),김일수(I.S. Kim) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
In this study, the objectives were to save cost, reduce molding cycle time and enhance the consistency of product dimensions of the insulating materials in Direct-Drive motor(DDM) use for one of the home appliances, the drum washing machine, compare to those of the existing one. Through reviewing the existing one's molding operating conditions, verifying it with molding analysis and optimizing the mold design and operating conditions applying the valve gate, and after test production, the following results were obtained. Due to weight reduction of the expensive material from 1,050g to 950g, the cost was reduced by 10%. The cycle time that includes heating of material, injection, cooling and ejection was reduced from 75sec to 50sec. The occurrence rate of the burned mark on the lower side of part was reduced to less than 1% by lowering the molding temperature from 285℃ to 270℃. The defect rate was reduced by 50% as the outer radial side of the part contraction and anisotropic deformation were reduce from the level of 1.2㎜ to 0.5㎜.
성형 롤러를 사용한 Support 자동 복원 장치 개발에 관한 연구
장경천(K.C. Jang),이동길(D.G. Lee),장훈(H. Jang) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
The objective of this work is to manufacture an auto reforming system of the skirt to reduce a great financial loss, danger at a works, intensity of work, environmental pollution, and so on. The LPG container was generally designed and manufactured having over 20 year life time. But skirt, circular shape part to keep standing of LPG container, is easy to damage during transportation because of carelessness and its weight. The system consists of input and output part, hydraulic generation part, operation part, and controller. And it had some special functions of feedback control system, machine stop, and alarm to prepare for the emergencies or abnormalities. The manufactured device was useful to enhance operation efficiency, improve of working environment, and save resources showed that the skirt was restored to the former state about over 95% without any risk, smog, and mist generation and the elapsed time for one cycle took about two minutes and occurred nose was below 59.8㏈.