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WC-Co 공구의 이온 주입에 따른 표면층 및 가공된 표면거칠기 특성
강성기(Seong-Ki Kang),김영규(Yung-Kyu Kim),왕덕현(Duck-Hyun Wang),전영록(Young-Rok Chun),김원일(Won-Il Kim) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.1
The most suitable condition for plasma source ion implantation(PSⅡ) was found based on the study of the characteristics of PSⅡed tool and machined surfaces. The depth analysis according to the chemical bonding state of elements and surface component elements through the XPS and SIMS, was conducted to find the improved property of the PSⅡed surface. Due to the diffusion of PSⅡ, the nitrogen was found up to a depth of about 150㎚ according to the supplied voltage and ion implanted time. The deep diffusion by nitrogen caused the surface modification, but the formation of oxide component was found due to the residual gas contamination on the surface. Statistical method of ANOVA was conducted to find the effects of spindle speed and feed rate in interaction for machined surface roughness with PSⅡed tools. The surface modification was found largely occurred by the nitrogen implanted surface with 2 hours for 27㎸, 35㎸ and 43㎸.
강성기(Seong-Ki Kang),이재근(Jea-Kun Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.4
In this paper, process conditions are investigated for elimination of the grain coarsening and improved material flow during forging process by both of experiments and FEM analysis. Particular interest has been given to understand role of preform shape on the grain coarsening behavior and magnitude of the hammer forging load. As the results of FEM simulation by using DEFORM-3D, the simulated forging loads were 2,200ton in the case of a machined bar which is machined from 65㎜ to 60㎜ diameter, and below 1,900ton in the case of machined preform, respectively. The use of preform has been beneficial for reduction of the forging load and elimination of the grain coarsening. However, in the case of as received bar and the round bar, which was machined to 2.5㎜ thickness in surface layer, some degree of local grain coarsening behavior has been observed. The optimized preform shape could be properly designed by applying the FEM simulation.
이지영,박진섭,강성기,Lee, Ji-Yeong,Park, Jin-Seop,Kang, Seong-Ki 대전대학교 군사연구원 2003 군사학연구 Vol.1 No.-
In this paper, we analyze the security requirement for a circulation of the classified documents. During the whole document process phases, including phases of drafting, sending/receiving messages, document approval, storing and saving, reading, examining, out-sending and canceling a document, we catch hold of accompanied threat factors and export every threat factors of security. We also propose an appropriate and correspondent approach for security in a well-prepared way. Last, we present the security guidelines for security architecture of the classified documents circulation.
신국식(Kuk-Sik Shin),강성기(Seong-Ki Kang) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.3
A tracked vehicle is dependent on performance of power pack and suspension systems. Especially, road wheels which are components of suspension system contribute distributing vehicle weight on soil and preventing from misguiding tracks. In this study, the maximum force was calculated that a tracked vehicle is driven on the worst condition. And then, FE analyses were carried out to evaluate strength road wheel under maximum force condition. In standard of quality evaluation for road wheel, FE simulations and experimental works were carried out under thirty degree slant load of normal direction of shaft. And then, A relationship residual deformation for slant load was investigated. The result of this research is applicable to evaluate strength and to make use of basis data.
김진수(Jin-Su Kim),강성기(Seong-Ki Kang),이동섭(Dong-Seop Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.5
In the study, the effect grinding condition on the workpiece arithmetical average roughness(Ra) to 10 steps leading to cutting each section with the spindle rotational speed 8000rpm and feed rate 150mm/min of grinding in GC(green silicon carbide) grinding processing after heat treatment and non heat treatment of SCM415 material. Also the following conclusions were obtained analysis of stress distribution displacement and finite elements method(FEM) on assemble parts with 3+2 axis simultaneous control through grinding and gave a load 11kg on ATC arm both sides gave a load of 11kg. For the centerline average roughness(Ra) in the heat and non-heat treatment work pieces, which were appeared the most favorable in the fifth section were 0.511㎛ and 0.514㎛, that were shown in the near the straight line section was the smallest deformation of curve. In addition, the bad surface roughness appeared on the path is too long by changing angle, the more inclined depth of cut, because the chip discharging is not smoothly.
SCM415의 절단가공이 표면조도와 재료 두께에 미치는 영향
김진수(Jin-Su Kim),강성기(Seong-Ki Kang),신미정(Mi-Jung Shin) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2
This study focused on how it affects the surface roughness of work piece in cutting SCM415 steel, widely used steel in industry, by TiCN and TiN tools. Following conclusion was drawn from several experiments. The surface roughness of heat treated workpiece was better than that of non heat-treated materials. Moreover, the roughness of surface roughness(Ra 0.25) on feeding rate of 0.05 was better when it was in wet process, rather than dry process. As the feeding rate increases, TiCN coating tool shows better roughness of surface than TiN tool. Also, in heated treatment, TiCN coating tool shows the least straightness dimension deviation at feeding rate of 0.05, 0.15mm/rev, and concave-like R shape appears by the feeding rate orders of 0.05, 0.15, 0.1, 0.125 and 0.075mm/rev.
CFRC 마찰특성을 이용한 항공기 ABS 브레이크 디스크의 개발
감문갑(Moon-Gab Kam),강성기(Seong-Ki Kang),김원일(Won-Il Kim) 한국산업융합학회 2007 한국산업응용학회 학술대회 논문집 Vol.- No.-
CFRC 소재 브레이크 디스크는 1973년 최초로 초음속 여객기인 콩코드에 적용되어 중량 감소 및 원활한 제동 성능을 성공적으로 발휘하여 사용된 이래, 국내 항공기에서는 2000년도부터 개발되기 시작했다. 항공기 브레이크 관성동력계 다이나모메타를 이용한 제동기능 및 마찰특성 실험과 이에 따른 마멸에 대한 표면 거동상태, 발열온도를 관찰하고, 최종적으로 실제 F-16 B32 항공기 Landing system에 장착하여 비행운용 이착륙시험을 통한 Landing condition과 마멸량을 관성동력계에서의 실험적 마멸량과 비교 분석하였다. 섬유 배열 방법을 3-D Preform으로서, 온도구배 화학증기증착(TG-CIV) 공법을 통해 밀도화(densification)된 F-16 B-32 항공기용 브레이크 CFRC 디스크는 미국 항공기 브레이크 원제작사(BF Goodrich사)와 동등이상의 품질로서 국내에서는 처음으로 실험적 연구개발로 완성되었다.