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송재용 ( J. Y. Song ),사승훈 ( S. H. Sa ),남정우 ( J. W. Nam ),김동환 ( D. H. Kim ),최영우 ( Y. W. Choi ),김진표 ( J. P. Kim ),고재모 ( J. M. Goh ),박남규 ( N. K. Park ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.3
We investigated the breakdown patterns of silica glass under the various impacts by forensic scientific analysis. The impacts were chosen by thermal and projectiles impact stress. Thermal impacts under the fire were constructed by changing the position of the flame with gas torches. Physical impacts were constructed with the projectiles of slingshots and rifles by changing the size of the projectiles at the surfaces and the initial distance. Also we identified incident angles of the projectiles by analysis of the punching portion at the glass surface. Under the thermal impacts, the breakdown patterns were various by changing the position of the flame. Especially, the configuration of breakdown patterns had radial shape with the position of the flame at the center of the glass sheet. Under the physical impacts by the projectiles, the breakdown patterns had always radial shape
형상정밀도 예측을 위한 780MPa급 차체부품의 스프링백 해석
최현준(H. J. Choi),전용준(Y. J. Jun),김세호(S. H. Kim),김기풍(K. P. Kim),김동환(D. H. Kim),임용희(Y. H. Lim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Finite element stamping analysis is carried out for the side sill inner member of an auto-body with a 780 MPa-grade high strength steel sheet in order to predict the spring-back phenomena accurately. The springback mechanism is investigated in the cross section of the stamped product quantitatively and the amount of the compensation angle is predicted to correct the unexpected shape inaccuracy. Parameters for the accuracy measurement such as gap and flush are calculated in the simulation and it is confirmed that the simulation result shows good agreement with the experimental one within ±1 mm tolerance.
엄재근(J. G. Eom),이민철(M. C. Lee),이장호(J. H. Lee),최영길(Y. G. Choi),김동환(D. H. Kim),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, finite element prediction of die wear is conducted using non-isothermal finite element analysis of an actual hot forging process for a commercialized crankshaft. The Archard wear model with a law of hybrid friction is utilized. The non-isothermal finite element method is employed and the predictions are also compared with isothermal finite element predictions with emphasis on the metal flow lines.
초정밀 Spring 진동 Lamination 미세타발용 고강도 펀치 형상설계
강재영(J. Y. Kang),박민철(M. C. Pack),최정일(J. I. Choi),김병민(B. M. Kim),김동환(D. H. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
In this study, progressive process is determined to manufacture the fine blanking for the spring lamination used as the linear motor unit of a commercial mobile phone, and design parameters of a die shape having influence the forgeability of progressive die is analyzed. Finite element method (FEM) determine the influence of fine blanking punch parameters. And in order to predict the tendency of process parameters, results of FE-simulation have been trained using artificial neural network (ANN). From the results, optimal punch shape is determined.
모합금의 균질화처리가 HDDR 처리된 Nd-Fe-Ga-Nb-B 합금의 자기적 특성에 미치는 영향
유지훈,이상협,김동환,이동원,김병기,최문희,김양도,Yu, J.H.,Lee, S.H.,Kim, D.H.,Lee, D.W.,Kim, B.K.,Choi, M.H.,Kim, Y.D. 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.4
HDDR treated anisotropic Nd-Fe-B powders have been widely used, due to their excellent magnetic properties, especially for sheet motors and sunroof motors of hybrid and electric vehicles. Final microstructure and coercivity of such Nd-Fe-B powders depend on the state of starting mother alloys, so additional homogenization treatment is required for improving magnetic properties of them. In this study, a homogenization treatment was performed at $900\sim1140^{\circ}C$ in order to control the grain size and Nd-rich phase distribution, and at the same time to improve coercivity of the HDDR treated magnetic powders. FE-SEM was used for observing grain size of the HDDR treated powder and EPMA was employed to observe distribution of Nd-rich phase. Magnetic properties were analyzed with a vibrating sample magnetometer.