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탄소 섬유강화 복합소재의 고압 수지이송 성형공정에서 직선형 믹싱헤드의 성능 및 유용성 평가
한범정(Beom Jeong Han),정용채(Yong Chai Jeong),황기하(Ki Ha Hwang),강명창(Myung Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
The high-pressure resin transfer molding (HP-RTM) technology has been commercialized for fast production of fiber reinforced composite materials. The high-pressure mixing head was one of the most core component of the HP-RTM process. In this study, a mixing head was systematically designed, manufactured and evaluated. This mixing head was composed of a nozzle, a mixing chamber, a cleaning piston part, and an internal mold release part. In actual, a straight-type structure was newly designed instead of the conventional L-type structure for improving the maximum mixing pressure and mixing ratio precision. The performance of mixing head was showed maximum mixing pressure of 15.22MPa and mixing ratio precision of 0.12%. CFRP molding experiments were successfully obtained a 6~11 laminating carbon sheet using HP-RTM presses and specimen molds.
탄소섬유강화복합소재의 고압수지이송성형공정에서 금형 내 캐비티의 압력 및 온도신호에 따른 성형특성
한범정(Beom-Jeong Han),정용채(Yong-Chai Jeong),김성렬(Sung-Ryul Kim),김노원(Ro-Won Kim),강명창(Myung Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
The high-pressure resin transfer molding (HP-RTM) process has a very effective for the mass production of carbon fiber reinforced plastic (CFRP) for light weight in the automotive industry. In developing robust equipment, new process and fast cure matrix systems reduces significantly the cycle time less than 5 minutes in recent years. This paper describes the cavity pressure, temperature and molding characteristics of the HP-RTM process. The HP-RTM mold was equipped with two cavity pressure sensors and three temperature sensors. The cavity pressure characteristics of the HP-RTM injection, pressurization, and curing processes were studied. This experiment was conducted with selected process parameters such as mold cap size, maximum press force, and injection volume. Consequently, this monitoring method provides correlations between the selected process parameters and final forming characteristics in this work.
Numerical visualization of mixing in a circular chamber by two opposite impinging jets
하미드 카바시안,김영우,이인범,한범정,정용채,김경천,Karbasian, Hamidreza,Kim, Youngwoo,Lee, In Bum,Han, Beom Jeong,Jeong, Yong Chai,Kim, Kyung Chun The Korean Society of Visualization 2016 한국가시화정보학회지 Vol.14 No.3
In this study, the mixing process of two distinct flow is numerically investigated. Two flow with different physical properties (resin and hardener) are mixed through the opposing mixing jets. At a high pressure mixing process, the high speed flow is provided by two in-line nozzles. In the case of numerical modeling, Reynolds-Averaged Navier-Stokes Equations (RANS) is conducted to model the flow pattern inside the chamber. Additionally, SST k-omega turbulence model is selected to predict the kinetic energy of flow in impingement zone. The results show that mixing of two distinct flows would be efficient if the velocity of jet is high enough and nozzle diameter is a predominant parameter. Also, this velocity would create higher shear stress between two distinct flows which increases the mixing quality as well as strength of formed vortices. Eventually, the histogram of concentration fraction of resin is examined in order to show the quality of mixing and the range of concentration fractions in the output of chamber.
Numerical visualization of mixing in a circular chamber by two opposite impinging jets
Hamidreza Karbasian(하미드 카바시안),Youngwoo Kim(김영우),In Bum Lee(이인범),Beom Jeong Han(한범정),Yong Chai Jeong(정용채),Kyung Chun Kim(김경천) 한국가시화정보학회 2016 한국가시화정보학회지 Vol.14 No.3
In this study, the mixing process of two distinct flow is numerically investigated. Two flow with different physical properties (resin and hardener) are mixed through the opposing mixing jets. At a high pressure mixing process, the high speed flow is provided by two in-line nozzles. In the case of numerical modeling, Reynolds-Averaged Navier-Stokes Equations (RANS) is conducted to model the flow pattern inside the chamber. Additionally, SST k-omega turbulence model is selected to predict the kinetic energy of flow in impingement zone. The results show that mixing of two distinct flows would be efficient if the velocity of jet is high enough and nozzle diameter is a predominant parameter. Also, this velocity would create higher shear stress between two distinct flows which increases the mixing quality as well as strength of formed vortices. Eventually, the histogram of concentration fraction of resin is examined in order to show the quality of mixing and the range of concentration fractions in the output of chamber.