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박기윤(Ki-Yoon Park),김현성(Hyeon-Seong Kim),강진현(Jin-Hyun Kang),박종천(Jong-Cheon Park) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
This paper deals with an CAE analysis and optimization of injection molding for a mobile phone cover. Two design goals are established in the optimization; one is to switch over the feed system from cold runner to hot runner for the purpose of reducing material costs, and the other is to minimize the warpage in order to improve product quality. By the full-factorial experiments for design parameters, we showed that the cold runner design could be changed to the hot runner design by replacing the current resin with a new resin of higher fluidity. In addition, we could significantly reduce the warpage of the cover product under the hot runner system by optimizing packing pressure and packing time.
사출성형 시뮬레이션에 의한 휴대폰 스피커 인클로저의 에어트랩 위치 최적화
박기윤(Ki-Yoon Park),박종천(Jong-Cheon Park) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
In this paper a design procedure via computer-aided molding simulation is presented to optimize the air-trap locations in a speaker encloser of mobile phone. The molding flow simulation reveals that the race-tracking phenomenon is the dominant feature in the current mold design. In obtaining an optimal filling pattern, the local modifications of the wall thickness such as in a flow leader attachment are considered as the primary control factor, and both the gate position and the filling time become the secondary control factor. In the one-at-a-time approach, the last location to be filled in the mold cavity could be successfully moved to the extremities of the part, allowing a natural ventilation of entrapped air through the mold parting plane.
Jong-Cheon Park(박종천),Man-Jun Yu(유만준),Ki-Yoon Park(박기윤) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
In this study, we design the feed system and process conditions for a lamp garnish lens of an automobile. For this purpose, four design alternatives are presented and injection molding simulation analyses are performed. The optimal feed system is selected by considering the formability of the product and the cost of mold manufacture. The product formability is assessed by the weld line, warpage, sink mark and the maximum injection pressure, whereas the mold-making cost is estimated by the number of valve gates in the hot runner system. To improve the product formability, process conditions are optimized using an experimental design approach named one-factor-at-a-time. No weld line is generated as a result of the optimization. In addition, it is found the warpage and sink mark are reduced while the maximum injection pressure is increased, compared with those before the optimization.