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가변러너를 이용한 LDPE/ABS/PA66 수지의 충전균형에 관한 연구
박형필(Hyung-Pil Park),차백순(Baeg-Soon Cha),강중근(Jung-Geun Kang),이병옥(Byung-Ohk Rhee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
During the injection molding process an excessive packing can occur in the smaller-volume cavity because of volumetric difference of the family-mold. It causes warpages by increased residual stress in the product and flashes by over packing. In this study, we developed a variable-runner system for the filling balance of the cavities by changing the cross-sectional area of a runner, and confirmed the filling imbalance by temperature and pressure sensors. We carried out experiments to examine the influence of types of resins such as LDPE/ABS/PA66 on the balancing-capability of the system, in order to help mold designers, who can easily adopt the variable -runner system to their design. We also confirmed the filling imbalance in the system with CAE analysis.
최재혁(Jae-Hyuk Choi),박도현(Dohyun Park),박창현(Chang-Hyun Park),이병옥(Byung-Ohk Rhee),최동훈(Dong-Hoon Choi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The injection molded part quality is affected much by the mold cooling so that it is necessary to optimize the mold cooling circuit in the part design step prior to the mold design step. Optimization of the mold cooling circuit has been proposed previously in various ways. In this work, optimization of the mold cooling circuit was automated by a commercial PIDO (Process Integration and Design Optimization) tool, PIAnO for a large automotive part such as bumpers and instrument panels. The cooling channels and baffle tubes were located on the offset profile equidistant from the part surface. The locations of the cooling channels and the baffle tubes were automatically generated and input to the mold cooling CAE program, Moldflow MPI Cool. The objective function was the deviation of the mold surface temperature from a given design temperature. Design variables in the optimization were the depths and distances of the cooling channels and the baffle tubes. Optimization was carried out by PQRSM. To reduce the cost in the optimization, the same problem was optimized by the DOE and metamodeling techniques supplied by PIAnO, and the results were compared with the one by PQRSM. As the result, more uniform temperature distribution compared with the initial design was obtained, and a satisfactory solution could be made at a lower cost in the approximate optimization.
마이크로 유전알고리즘을 이용한 사출성형품의 게이트 위치 최적화
조성빈(Sung-Bin Cho),박창현(Chang-Hyun Park),표병기(Byung-Gi Pyo),이병옥(Byung-Ohk Rhee),최동훈(Dong-Hoon Choi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A design problem was formulated to minimize the injection pressure while preventing weldlines. To solve this design problem, we integrated MAPS-3D (Mold Analysis and Plastic Solution-3Dimension), a commercial injection molding analysis CAE tool, using the file parsing method of PIAnO (Process Integration, Automation and Optimization) as a commercial PIDO (Process Integration and Design Optimization) tool. Then, we used micro GA (Genetic Algorithm) equipped in PIAnO. Using the proposed design approach, the injection pressure has been reduced compared to the initial one while satisfying the design constraint. This design result clearly shows the validity of the proposed design approach.
압력 최소화를 위한 자동차용 도어트림의 밸브 게이트 위치 최적화
조용수(Yong-Su Joe),박창현(Chang-Hyun Park),표병기(Byung-Gi Pyo),이병옥(Byung-Ohk Rhee),최동훈(Dong-Hoon Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this study, we decided the valve gate locations to minimize the injection pressure. To automatically build the finite element model of the runner system corresponding to the valve gate locations changed, we developed a runner system automatic modeling module. To solve this design problem, we integrated MAPS-3D, a commercial injection molding analysis CAE tool, using the file parsing method of PIAnO as a commercial process integration and design optimization tool. To obtain an optimal solution sufficiently, we used an orthogonal array as an experimental design available in PIAnO. Using the proposed design approach, the maximum injection pressure has been reduced by 25% compared to the initial one. This design result clearly shows the validity of the proposed design approach.
사출성형기 실린더와 금형 캐비티의 실시간 모니터링을 이용한 사출성형공정 비교 분석
박형필(Hyung Pil Park),차백순(Baeg Soon Cha),태준성(Jun Sung Tae),최재혁(Jae Hyuk Choi),이병옥(Byung Ohk Rhee) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
최근 고품질 제품 생산을 위한 방법으로 센서를 이용한 사출공정모니터링 시스템이 적용되고 있다. 그러나 마이크로 금형, 광학용 금형 및 구조가 복잡한 금형에는 센서 설치가 어렵기 때문에, 공정 모니터링 시스템이 적용되기 어려운 단점이 있다. 본 연구에서는 금형과 사출성형기 노즐의 압력 을 측정하여 공정 모니터링 데이터의 정량적 지수를 정의하고, 성형품 중량에 대한 상관분석을 수행하여 노즐에 설치된 압력센서의 공정모니터링 적용성을 알아보았다. 또한 공정모니터링 데이터를 분석하여 다단사출속도, 보압 및 제한 사출 압력의 영향에 따른 사출성형기의 공정 제어 특성도 알아보았다. Recently, on-line process monitoring systems using sensors are being extensively used to produce highquality products. However, the difficulty in installing the sensors within the mold in the cases of micro-molds, optical molds, and molds with complex structures is a serious disadvantage of such process monitoring systems. In this study, the quantitative index of a process monitoring system was evaluated with the mold cavity pressure and the nozzle pressure for the injection molding machine. In order to evaluate the effect of the nozzle pressure, we performed correlation analysis for the weight of the molded product. We also examined the control characteristics of the injection molding machine by analyzing the effect of multistage injection speed, holding pressure, and injection pressure limit on the process monitoring data.