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나노유체를 이용한 메소스케일 밀링 가공 특성에 관한 실험적 연구
이필호(P. H. Lee),남택수(T. S. Nam),Chengjun Li,이상원(S.W. Lee) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
본 논문에서는 압축냉각공기, MQL 및 MoS₂ 나노유체 MQL 을 적용한 메소스케일 밀링의 가공 특성에 관한 실험적 연구를 수행하였다. 마이크로/메소 밀링 가공 실험 수행을 위하여 BLDC 스핀들과 DC 모터슬라이드를 장착한 데스크톱 크기의 3 자유도 메소 스케일 기계가공 시스템을 구현하였고, 가공 시편의 표면거칠기 측정 및 분석을 통해 가공성능 평가를 수행하였다. 실험을 통해 압축냉각공기, MQL 및 MoS₂ 나노유체 MQL 을 사용한 경우 건식가공에 비하여 표면거칠기가 향상되는 것을 발견하였으며 특히 MoS₂ 나노유체 MQL 과 압축냉각공기를 동시에 적용하였을 경우의 가공 표면거칠기가 가장 우수함을 확인하였다. This paper present the characteristics of micro- and meso-scale milling processes in which compressed cold air, minimum quantity lubrication (MQL) and MoS₂ nanofluid MQL are used. For process characterization, the microand meso-scale milling experiments are conducted using desktop meso-scale machine tool system and the surface roughness is measured. The experimental results show that the use of compressed chilly air and nanofluid MQL in the micro- and meso-scale milling processes is effective in improving the surface finish.
가공환경의 변화에 따른 블레이드 형상의 가공성 평가 기술
황윤호(H.Y. Hwang),이득우(D.W. Lee),김정석(J.S. Kim),강명창(M.C. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
Recently, environmental pollution has become a big problem in industry and many researches have been done in order to preserve the environment. In the milling process, the cutting fluid has great influence on the environment. If these additives(S, Cl, P) in cutting fluid go into the workplace atmosphere, it is harmful for workers. Therefore, many reasons cause to minimize the amount of cutting fluid. The paper presents a cooling method effectiveness of compressed cold air and oil mist than the that of cutting fluid. And this study show that tool life, surface roughness, surface profile, roundness become better when machining by using compressed cold air and oil mist.
저온 냉풍시스템을 이용한 환경친화적 가공시스템의 성능평가
배정철,김경중,황인옥,강명창,김정석 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2
In industrially advanced countries, environmentally conscious machining was eagerly studied because of ecological and economical reasons. As the environmental regulations become stricter, the new machining technologies which take environmental aspects into consideration are being developed. Recently the research institutions have established application method for dry, semi-dry, oil-mist and compressed cold air machining. In this paper the performance of new compressed cold air system for environmentally conscious machining is investigated and machinability of dry and new compressed cold air machining is evaluated. A series of tests are carried out by using measuring equipments in condition of dry and compressed cold air machining.
냉각ㆍ윤활방식 변화에 따른 가공면의 미시적 정밀도 평가
황인옥(I. O. Hwang),권동희(D. H. Kwon),강명창(M. C. Kang),김정석(J. S. Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
As the technique of high-speed end-milling is widely adopted to machining field. The investigation for microscopic precision of workpiece is necessary for machinability evolution. The environmental pollution has become a big problem in industry and many researcher have investigated in order to preserve the environment. The environmentally conscious machining and technology have more important position in machining process. In the milling process, the cutting fluid has greatly bad influence on the environment. The damaged layer affect mold life and machine parts in machining. In this study, the cutting force, the surface roughness, micro hardness and residual stress is evaluated according to machining environment. Finally, it is obtained that the characteristics of damaged layer in environmentally conscious machining is better than that in conventional machining using cutting fluid.
고속 엔드밀가공에서 가공환경 변화에 따른 가공면의 미시적 정밀도에 관한 연구
권동희(Dong-Hee Kwon),이종환(Jong-Hwan Lee),황인옥(In-Ok Hwang),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.6
The investigation of microscopic precision in high speed endmilling is necessary for machinability evaluation, and the environmentally conscious machining technology have more important position in recent machining process. The microscopic precision of workpiece is influenced by machining environments variation as cutting fluid type and lubricant method. In this study, the cutting forces according to variation of cooling and lubrication are investigated by specially designed tool dynamometer. And the surface roughness, micro hardness and residual stress are evaluated according to machining environment. The characteristics of damaged layer in environmentally conscious machining and conventional machining using cutting fluid are compared experimentally.
권동희(Dong-Hee Kwon),황인옥(In-Ok Hwang),이종환(Jong-Hwan Lee),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The investigation for microscopic precision of workpiece is necessary for machinability evolution and the environmentally conscious machining technology have more important position in machining process. In the milling process, the cutting fluid has greatly bad influence on the environment. The damaged layer affect machine parts in machining. In this study, the cutting force, cutting temperature, Von-Mises stress, and plastic deformation layer according to variation of cooling and lubrication method is investigated by simulation and experiment. And the surface roughness is evaluated according to machining environment. Finally, it is obtained that the characteristics of damaged layer in environmentally conscious machining is better than that conventional machining using cutting fluid.
권동희(Dong-Hee Kwon),황인옥(In-Ok Hwang),이종환(Jong-Hwan Lee),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
The investigation for microscopic precision of workpiece is necessary for machinability evolution and the environmentally conscious machining technology have more important position in machining process. In the milling process, the cutting fluid has greatly bad influence on the environment. The damaged layer affect machine parts in machining. In this study, the cutting force, cutting temperature, Von-Mises stress, and plastic deformation layer according to variation of cooling and lubrication method is investigated by simulation and experiment. And the surface roughness is evaluated according to machining environment. Finally, it is obtained that the characteristics of damaged layer in environmentally conscious machining is better than that conventional machining using cutting fluid.