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권주리(J. R. Kwon),남중희(J. H. Nam),이영선(Y. S. Lee),강창원(C. W. Kang),이진길(J. G. Lee),손재환(J. H. Son),최원식(W. S. Choi) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this study, we will simulate the hydrodynamic load capacity and equivalent roughness for textured surface in oil lubrication for well understanding of friction properties by hydrodynamic lubrication theory. In the dimple pattern, dimple depth is 2μm and dimple size is 40μm, 70μm, and 100μm. Calculated Rrms<SUP>*</SUP> is 47nm from measured value of Rrms,1 and Rrms,2. Viscosity was 3.125Pa · s for paraffin oil. It can be seen that hydrodynamic load capacity WHL increased with the decreasing of minimum oil film thickness hmin. And if we compare the maximum WHL at hmin=Rrms<SUP>*</SUP>,100μm diameter dimples showed largest of all as 9.2N. Maximum WHL at hmin=Rrms<SUP>*</SUP> is 7.5N and 6.2N for 70μm, 40μm diameter dimples, repectively. WHL of the flat slider shows almost of zero. It was shown the hydrodynamic lubrication in dimple patterning and could be seen that an increase in durability.
최원식(Choi W. S),남중희(Nam J. H),손재환(Son J. H),이인(Lee Ihn),문희준(Mun H. J),권주리(Kwon J. R) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
We have introduced the development for the manufacturing of the transmission helical gear in automobile in the future. The forging production of the helical gear for transmission was very useful to reduce the cost down and increase the life cycle than machining the gear as gear hobbing and turning. As result the simulation for the forging process by the computer, the temperature increase in lower pressure, the pressure lower in lower velocity in analysis the SCr420H steel. Also we had known as total reduction cost was up to 30% compare the machining the gear.
최원식(W. S. Choi),남중희(J. H. Nam),강창원(C. W. Kang),김원구(W. G. Kim),이인(I. Lee),권주리(J. R. Kwon),박세영(S. Y. Park),문희준(H. J. Mun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this study we investigate the machining characteristics of tool material for cold forging by using the machining center. The test was in the SKD62 cold forging material by 2-edge endmill with cutting fluid. The coating conditions are depth of cut 1,2,3mm, WC-endmill, federate 20mm/min, cutting velocity 20m/min. The surface roughness increase as the depth of cut increase. Also cutting force increase whiles the depth of cut increase.