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홍남표(Hong N. P),김병희(Kim B. H),권민호(Kwon M. H),주종남(Chu C. N),김보현(Kim B. H),김종균(Kim J. K),최광보(Choi K. B),이승용(Lee S. Y),김학구(Kim H. K) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In this paper, novel submerged water journal & thrust bearings for a canned type electric water pump, which are crucial parts for the green cars development, has been developed. The canned type electric water, in which the cooling water is usually sealed by a can, is able to enhance fuel efficiency and reduce emission. Using analytical and numerical analyses, the journal and thrust bearings were designed and fabricated by sintering and machining of a SiC based bearing material. To improve the performance of the bearings, an in-house-level bearing testing system was developed and some preliminary wear tests are conducted for verifying the validity of the developed system.
저주파 가진 시스템에 의해 성형된 마이크로 패턴의 특성 분석
박찬진(C. J. Park),최종필(J. P. Choi),박동영(D. Y. Park),홍남표(N. P. Hong),이혜진(H. J. Lee),이낙규(N. K. Lee),김성욱(S. O. Kim),주은덕(Andy Chu),김병희(B. H. Kim) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Many researchers have developed several micro-forming technologies such as micro deep drawnig, micro press forming, micro forging, extrusion etc. for forming of precise micro-patterns on a surface of metal substrate but the multi-step forming processes have been used to improve quality of the deformed patterns. The low frequency vibration forming system, which developed in the research, can not only easily deform the surface of metal substrates but also can remove the couple of steps of the conventional multi-step forming process. In order to find optimal process conditions, lots of experiments were carried out under varying the vibration frequency from 100㎐ to 500㎐. As a experimental results, The desktop micro forming system has obtained better results from low frequency vibrations than non-vibration.
박찬진(C. J. Park),최종필(J. P. Choi),박동영(D. Y. Park),홍남표(N. P. Hong),이혜진(H. J. Lee),이낙규(N. K. Lee),김성욱(S. O. Kim),주은덕(Andy Chu),김병희(B. H. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, the low frequency vibration forming system is developed for micro-patterns formation on the metal substrate. many researchers have studied about micro-forming technologies such as micro deep drawing, press forming, forging, extrusion etc. for the formation of precise micro-patterns on the surface of metal substrates, multi-step forming process must be used to improve qualifies of the deformed patterns. Since the low frequency vibration forming system could easily deform the surface of metal substrates, several steps of multi-step forming process should be removed by using the low frequency vibration forming system. In order to find optimal process conditions, we have carried out low frequency vibration forming process with varying the vibration frequency from 110Hz to 500Hz.