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다점 핀포인트 금형에서 균형충전이 가능한 사출금형 구조
권윤숙,정영득,Kwon, Youn-Suk,Jeong, Yeong-Deug 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
Almost all injection molds have multi-cavity runner system for mass production, which are designed with geometrically balanced runner system in order to accomplish filling balance between cavity to cavity during processing. However, even though geometrically balanced runner is used, filling imbalance have been observed. Filling imbalance could be decreased by modifying processing conditions such as injections rate, mold temperature, injection pressure, melt temperature that are related to shear, viscosity. In this study, a series of experiment was conducted to investigate filling imbalance variation when modifying runner layout and ploymer and to determine which processing condition influences as the primary cause of filling imbalance in geometrically balanced runner system. The filling imbalance was desreased up to result range of $3{\leq}DFI{\leq}8(%)$ by using a new runner system for balanced filling.
다구찌의 강건설계 기법을 이용한 사출 성형품의 싱크 마크를 최소화하기 위한 사출성형 조건의 최적화
권윤숙,정영득,Kwon, Youn Suk,Jeong, Yeong Deug 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
In the manufacture and processing of large plastic materials, product quality is tested and verified through several techniques such as injection processing, residual stress through injection molding and shrinkage. With regards to the injection molding process, common problems such as inconsistent density is seen when different points of the product are discovered to have varying thickness levels. Sink marks in product are then evident. This occurs when there is poor molding conditions caused about by poor runner and packaging systems incorporated into the process. We designed the runner system which is possible balanced filling to cavities using CAE program $Moldflow^{TM}$ and then obtained optimal processing conditions by Taguchi's Robust Design technique.
한동엽,정영득,Han, Dong-Yeop,Jeong, Yeong-Deug 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
Aspect of filling imbalance that is originated from imbalanced share rate in runner is changed by material property, runner layout that are factors of changing viscosity and by injection pressure, injection speed, melt temperature and mold temperature that are injection conditions. In this paper, we made a study of runner system that is one of factor of filling imbalance and Sharp Conner Effect and Groove Corner Effect that are recently released. The study are showed that filling rate of between inside and outside cavity was influenced on shape of runner. Also, we suggested runner system for filling imbalance by adapting the two effects at multi cavity of unary branch type and theoretical investigated flow in the Shrap Conner runner type.
다수캐비티 사출금형에서 충전 불균형이 성형 품질에 미치는 영향
한동엽,정영득,Han, Dong-Yeop,Jeong, Yeong-Deug 한국금형공학회 2013 한국금형공학회지 Vol.7 No.1
The injection molding process is a predominant method for producing plastic parts. In order to maximize productivity and molding quality in a injection mold, it is important that each cavity in a multi-cavity injection mold is identical. This requires that cavity dimensions should be identical and delivery system of melt to each cavity have to be the same. Despite the geometrically balanced layout in multi-cavity injection mold more than 4 cavities, it has been observed that the filling in each cavity results in imbalances. Most of cases, this phenomenon of filling imbalances have a bad effect on dimension accuracy, warpage, molding appearance and strength of molding parts. In this study, experiment were conducted to investigate the effect of filling imbalances on the molding quality(surface gloss, shrinkage, tensile strength) in the multy-cavity injection mold.
나뭇가지형 러너시스템을 갖는 사출금형에서의 충전 불균형
한동엽,정영득,Han, Dong-Yeop,Jeong, Yeong-Deug 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
Recently, the study for filling imbalance in thermoplastic polymer has gradually been increased. However, it is hard to find the researches for filling imbalance of thermoplastic elastomer(TPE). The experiment of filling imbalance was conducted for thermoplastic vulcanize(TPV) and PP, ABS polymers in the mold with un-geometrically balanced runner system(Branch Type Runner System). In this experiment, the effects of the melt temperature, injection pressure and injection speed on the filling imbalance were investigated.
다구찌 방법을 이용한 폴리아미드 성형품의 충전 불균형에 관한 연구
한규택,정영득,구양,김병탁,김형제,한성렬,Han, Kyu-Taek,Jeong, Yeong-Deug,Goo, Yang,Kim, Byung-Tak,Kim, Hyung-Je,Han, Seong-Ryul 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
Plastics is used to produce precise parts with an inclusion of a reinforcement material such as glass fiber or carbon fiber to improve the dimension accuracy. The plastic goods can be produced with inaccurate dimensions, low mechanical strength, or residual stress due to the over packing of cavity inside, if the filling balance of melt resin is not accomplished. To overcome this problem, it is necessary to design the runner system with the geometrical balance at the mold design stage. However, even if the balanced runner system is achieved, a severe filling imbalance is observed practically in a multi-cavity mold. In this study, experiments were performed with Taguchi method to achieve the filling balance in multi-cavity mold with a symmetric runner system, by the use of pure PA and PA with glass fiber 33%. The experimental results were investigated to understand the effect of related molding factors on the filling imbalance for two resins.
노병수,정영득,Noh, Byeong-Su,Jeong, Yeong-Deug 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
In recent, recycling of plastic material has became a major issue due to the landfills and environmental problem. This study investigated fluidity and hardness of thermoplastic vulcanizate(TPV), which is used for automobile component parts such as weather strip in order to replace ethylene propylene rubber (EPDM). So, using the spiral flow test mold, we conducted an experiment on fluidity and hardness of TPV according to injection molding conditions. As results of injection molding experiment, the recycled TPV's flow length was a little bit longer than virgin TPV and the hardness was decreased in case of using the recycled resin. Also, we investigated the morphology study by SEM photo.