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IMD 공정특성 예측을 위한 사출 및 필름성형 간의 연계해석
윤종혁(Jonghyuk Yoon),허남건(Nahmkeon Hur),배아현(Ah-Hyun Bae),이태희(Taehee Lee),송보미나(Bomina Song) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Recently, in-mold decoration (IMD) process is one of the popular manufacturing methods to produce exterior plastic parts. IMD process is widely utilized and expanded whole industry owing to proceeding injection molding process and film forming process simultaneously. In the IMD process, rheological resin is directly injected behind film surface with high temperature and pressure conditions, and then local deformation characteristics such as thickness variation, stress and temperature distribution arise on film surface. To predict this local deformation, it is necessary to analyze the IMD process by linking between injection molding process and film forming process. In the present study, to predict this local deformation on film surface, the methodology of connecting CAE analysis was proposed between the film forming analysis and the injection molding analysis. First, injection molding analysis was carried out by using finite element method, and then shape of resin injected at each time step was depicted as a punch objective from film deformation analysis. With results of connecting CAE analysis, it was figure out that highest stress was applied to around injection gate and film thickness near the corner of plastic parts has thinned. In conclusion, it was predicted that local deformation characteristics was obtained by the methodology of connecting CAE analysis on film surface of plastic part.
스프레이 도장에서 제품 모서리의 도료 뭉침 현상에 대한 수치해석적 연구
이상혁(Sang Hyuk Lee),허남건(Nahmkeon Hur),홍석현(Seok Hyun Hong),임기열(Ki Yul Lim),배아현(Ah-Hyun Bae) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
It is important to predict the paint sagging in the spray painting for the quality assurance and quality improvement of painting process. With the effect of surface tension of paint film around object, the paint sagging easily occurs around the corner of object. In the present study, the two-phase interfacial flow of the paint film on the small plastic object was numerically investigated by using a VOF method. For the simulation of paint sagging phenomenon, the paint properties such as density, viscosity and surface tension coefficient was measured with the paint used in the spray painting of plastic object. With these paint properties, the behavior of paint film was predicted with the specific initial film thickness around the painted object. In the steady state of film behavior, the numerical results of film thickness showed a good agreement with the experimental results. The characteristics of paint sagging around corner were numerically analyzed with various geometric model.