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DAEM 분석 방법을 통한 국내 수입탄의 탈휘발화 반응특성에 관한 실험적 연구
김량균(Ryang Gyoon Kim),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The experiment was designed to study the pyrolysis kinetics of two different classes of coal. The pyrolysis behaviors of the coals were first observed with thermogravimetric analyzer(TGA). The kinetic analysis was further done based on a new distributed activation energy model(New DAEM). During the analysis, thermogravimetric curves measured at three different heating rates were used to obtain the activation energy distribution function curve ?(E) of a given coal sample where mean activation energy is determined by its peak. The results show a significant difference in the mean activation energy between two coals for the pyrolytic reaction.
다이슬라이드식 사출성형을 통한 플라스틱 밀봉용기 성형에 관한 연구
문성준(Seongjoon Moon),이평찬(Pyoungchan Lee),정수진(Soojin Jeong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Die slide injection as eco-friendly manufacturing process marvelously reduces the cost and time in processing plastic sealed container because they can simplify the conventional process through eliminating additional process. However, the high-speed injection of resin-seal-molding in the die slide injection invokes undesired shape defects, which can be extremely minimized by die correction or process parameter control. In this study, the process parameters of the injection molding are optimized by using CAE analysis and Taguchi method. The process variables are optimized by using the L₁?(or L?)orthogonal array and smaller-the-better characteristics of the Taguchi method. In addition, according to two kind of polypropylene and one kind of polyethylene, results of experiments were compared by measuring as the analyzing experiments. Consequently, the applicability of the Die slide injection was confirmed.
수지밀봉공정을 위한 고속사출에서 다양한 폴리머수지의 특성에 관한 연구
정수진(Soo-Jin Jeong),문성준(Seong-Joon Moon),정선경(Sun-Kyoung Jeoung),이평찬(Pyoung-Chan Lee),문주호(Juho-Moon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Die slide injection marvelously reduces the cost and time in processing plastic products because they can simplify the conventional process through eliminating additional process. However, this process must resolve some defects like whitening, resin infiltration, blowhole, resin overflow, etc. In addition to, secondary injection process(Resin-Seal-Molding) occur in the high-speed injection. In this study, the process parameters of the injection molding are optimized by using the finite element method and Taguchi method. The injection molding analysis is simulated by employing the Moldflow insight 2010 code and the 2nd injection is by adopting the Multi-stage injection code. The process parameters are optimized by using the L9 orthogonal array and smaller-the-better characteristics of the Taguchi method that was used to produce an airtight container(coolant reservoir tank) from polypropylene(PP) and polyethylene(PE). Meanwhile, the optimum values are confirmed to be similar in 95% confidence and 5% significance level through analysis of variance(ANOVA). Moreover, according to materials (Two kinds of PP, one kind of PE) were compared by measuring the material properties (TGA: Thermo Gravimetric, DSC: Differential Scanning Calorimetry, IR: Infrared Ray). In this way, the applicability of the Die slide injection was confirmed.