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조창연(C. Y. Jo),신홍규(H. G. Shin),박동영(D. Y. Park),홍남표(N. P. Hong),김병희(B. H. Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The Injection molding process has a high accuracy, good reproducibility in high numbers and at lows cost. However, it has been known that it is hard to understand the size limitation and requirement for a very highly pressure and various parameters. In order to overcome these problems, we developed an injection molding system for production of micro-LGP(Light Guide Plate) and carried out various experiments with respect to injection pressure, molding temperature, back pressure, and molding time etc. And also, in order to overcome molding defects such as flow marks, non-fill, and sticking etc., the peltier elements for stable control of molding temperature was used. Through various experiments and analyses, the performance and validity of our injection molding system confirmed. Finally, we compared results and parameters of an injection molding system with those of a hot embossing system. Consequently, we proved that, compared with a hot embossing process, an injection molding process will likely have a better performance, cost-effectiveness and yield.
조창연(C. Y. Jo),신홍규(H. G. Shin),박동영(D. Y. Park),홍남표(N. P. Hong),김병희(B. H. Kim) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
The Injection molding process has a high accuracy, good reproducibility in high numbers and at lows cost. However, it has been known that it is hard to understand the size limitation and requirement for a very highly pressure and various parameters. In order to overcome these problems, we developed an injection molding system for production of micro-LGP(Light Guide Plate) and carried out various experiments with respect to injection pressure, molding temperature, back pressure, and molding time etc. And also, in order to overcome molding defects such as flow marks, non-fill, and sticking etc., the peltier elements for stable control of molding temperature was used. Through various experiments and analyses, the performance and validity of our injection molding system confirmed. Finally, we compared results and parameters of an injection molding system with those of a hot embossing system. Consequently, we proved that, compared with a hot embossing process, an injection molding process will likely have a better performance, cost-effectiveness and yield.
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(E.D. Joo),김병희(B.H. Kim) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
In this paper, the ultrasonic vibration molding method is developed for forming micro patterns on the metal substrate. So many researchers study about the micro molding technology such as micro deep drawing, press forming, forging, extrusion etc. but if we want to make a micro pattern on the surface of the metal substrate, we must use multi-step forming process to maintain the size of the product or substrate. However, these problems can be solved by using ultrasonic vibration molding system. Because the ultrasonic vibration molding method deform the surface of mold easily. This paper describes the optimization techniques of ultrasonic vibration molding condition such as the frequency forming method and optimal frequency range to make a micro pattern on the metal substrate. The frequency range can be classified to ultrasonic range, high & low frequency range.
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 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
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.