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편측분기형 러너 금형에서 가스사출 성형변수가 성형품의 중공부 길이 변화에 미치는 영향
한성렬(Seong Ryul Han),박태원(Tae Won Park),정영득(Yeong Deug Jeong) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.1
Gas-Assisted Injection Molding(GAIM) is an innovative technology for producing plastic parts and has been received extensive attention in the plastic manufacturing industries. But, due to gas-polymer interacting during the gas injection phase, the process has significantly different characteristics from conventional injection molding and, therefore, the control of the process requires much technical knowledge in processing and materials. The experiment was performed about variations of gas-penetration length that is affected by filling imbalance resulting from the structure of runner. The Taguchi method was used for the design of experiment. The most effective factors for the gas-penetration length were the shot size and mold temperature. The most effective factors for the difference of the gas-penetration length were the melt temperature and shot size. This study also discussed the filling imbalance phenomenon in a unary branch runner type mold that has geometrically balanced runner.
가스사출성형인자가 가스사출성형품의 중공부 형성에 미치는 영향
한성렬(Seong Ryul Han),박태원(Tae Won Park),정영득(Yeong Deug Jeong) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.4
Gas-assisted injection molding (GAIM) process is reducing the injection pressure during mold filling required as well as the shrinkage and warpage of the part and cycle time. Despite of these advantages, this process introduces new parameters and makes the application more difficult because the process interacts between gas and melt during injection molding process. Important GAIM factors that involved in this process include gas penetration design, locations of gas injection points, shot size, gas injection delay time as well as common injection molding parameters, gas pressure and gas injection time. In this study, the experiments were conducted to investigate effects of GAIM process variables on the gas penetration for PP and ABS moldings by changing gas injection point. Taguchi method was used for the design of experiment. When the gas was injected at cavity's center, the most effective factor was shot size. When the gas was injected at cavity's end, the most effective factor was melt temperature. Injection speed was also an effective factor in GAIM process.
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.