• Title, Summary, Keyword: 사출성형 해석

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A Study on Improvement of 100 Tons Toggle Injection Molding Machine's Weight Using Numerical Analysis (수치해석을 이용한 토글식 100톤 사출성형기의 중량 개선에 관한 연구)

  • Han, Seong-Ryeol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.4713-4718
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    • 2013
  • Nowadays, three-dimensional computer added design(3D CAD) tool are widely and actively used for design of mechanical machine. Because using the tool is more effective to understand design concept and to collaborate with other operation than using two-dimensional design tool. In this study, the 3D CAD tool which is called I-DEAS was applied for three-dimensional modeling of main parts and assembling of modeled parts for identification the entire shape of a injection molding machine. In addition, a study was also performed regarding reduction for the weight of main plates for saving production cost and energy in the machine. A finite element method(FEM) program in I-DEAS tool was used for the improvement study. First, the current main plates were structural analysed and then the plate deformations, weak regions and stress distributions were graped. By the FEM results, the 2nd improved designing of the plates was conducted such as reinforcement or slimming of the plate wall thickness. The 2nd structural FEM was performed for verification of the redesigned plates and then the FEM results were compared with the 1st FEM's result. The weight of the main plates were averagely reduced approximately 3 - 7%. By these results, it was seemed that the improved plates have a useful availability.

Development of Plastic Lenses for High-Resolution Phone Camera by Injection-Compression Molding (사출압축성형을 적용한 고해상도 폰 카메라용 플라스틱 렌즈 개발)

  • Lee, Ho Sang;Jeon, Won Taek;Kim, Sung Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.1
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    • pp.39-46
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    • 2013
  • This study aims to develop a plastic aspheric lens for a 13-megapixel mobile phone camera by injection-compression molding. A mold for injection-compression molding experiments was fabricated with a movable upper plate and four springs. During cavity filling for an aspheric lens with a thickness ratio of 2, a weldline was formed under conventional injection molding, whereas no weldline was formed under injection-compression molding with a compression stroke of 0.3 mm. The flow patterns were in good agreement with the simulation results. The birefringence decreased as the compression stroke increased, and the birefringence produced by injection-compression molding was very low and more uniform compared with that produced by injection molding. In addition, the bulk birefringence of an assembly composed of four plastic lenses was significantly affected by the orientation of the lenses to be mounted.

A Study on Mixing of Silicon Nitride Fine Powder and Binder System for Ceramic Injection Molding (세라믹 사출성형을 위한 질화규소 미세분말과 결합체 시스템의 혼합에 대한 연구)

  • 윤재륜
    • The Korean Journal of Rheology
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    • v.2 no.1
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    • pp.67-78
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    • 1990
  • 세라믹 분말의 사출성형성을 평가하기 위하여 다양한 혼합체 시스템에 대한 혼합도 와 유변학적 성질을 질화규소 미세분말의 부피비를 변화시키면서 조사하였다. 열가소성 결 합체 시스템은 폴리에틸린 폴리에틸렌 왁스 그리고 미소량의 첨가제를 혼합하여 사용하였 다. 혼합성능을 평가하기 위하여 비분산혼합에서는 총접촉면적비를 그리고 분산혼합에서는 총파괴표면적비를 혼합척도로서 사용하여 정성적으로 모형화하였다. 사용된 혼합기내의 유 동장을 해석하기 위하여 뉴우톤유체를 가정하여 유동해석을 수행하였다. 혼합물의 혼합도는 각각 5분 30분 동안 혼합된 시편을 주사전자현미경 사진에 의해 관찰하여 평가하였다. 또한 혼합물의 사출성형성 그리고 혼합질 점도 토우크 곡선 사이의 관계를 규명하기 위하여 전단 변형를 속도를 따른 점도를 모세관 점도계를 사용하여 측정하였으며 질화규소의 부피비가 60%일 때까지는 만족할 만한 성형성과 혼합질을 가짐을 알 수 있었다.

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A study on Optimal Process Conditions of Thin Injection- molded Part Using Flow Analysis (유동해석을 통한 0.3mm 극박판 성형 제품/금형 설계의 최적조건 도출에 관한 연구)

  • Jang Ji-Eun;Huh Yong-Jeong
    • Proceedings of the KAIS Fall Conference
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    • pp.87-89
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    • 2004
  • 정밀화와 더불어 고품질화 되고 있는 사출성형 산업에서 CAE기술(Computer Aided Engineering)은 성형 시행오차를 줄여 원가를 절감하고, 생산성을 향상시킬 수 있는 최적의 대안이라 할 수 있다. 본 연구는 이러한 CAE 기술을 활용하여 현장에서 사출성형하기 힘든, 두께 0.3mm인 소형 RC비행기 Battery Case제품을 대상으로 유동해석을 통해 최적 Gate와 유동기구의 설계 조건을 도출하고 구현하고자 하였다.

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Numerical Analysis of Cooling Channels for Injection Molding Cycle Time Improvement of Plastic Horn Cover for an Automobile (차량용 플라스틱 혼 커버의 사출성형 싸이클 타임 개선을 위한 냉각 채널의 수치해석 연구)

  • Han, Seong-Ryoel
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.5
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    • pp.84-90
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    • 2018
  • When producing a plastic horn cover for an automobile, since the interval between the ribs on the inner surface is narrow, conventional cooling channels cannot be applied and cooling of the mold is difficult. For this reason, the molding operation cannot be completed within a set cycle time. In this study, a conformal cooling channel was applied on the mold to solve the cooling problem. Injection molding simulation was carried out to confirm the effectiveness of the conformal cooling channel. In the analysis results, the mold temperature at the rib section decreased by 33%, and the mold temperature also decreased by 31%. This reduction in temperature allowed for molding within a set cycle time and demonstrated the effectiveness of the conformal cooling channel.

A Study on the Comparison of Flow Analysis and Practical Molding for Automobile Bumper Molding (자동차범퍼의 사출성형 해석결과와 실제 성형품의 비교 연구)

  • Hwang S.H.;Kim C.G.;Ji S.D.;Kim M.K.;Moon Y.B.;Jeong Y.D.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.357-358
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    • 2006
  • Importance of using an injection molding analysis has been increased. However the application of it has not been increased because the results of analysis do not sometime match to practical molding. Therefore, the difference of flow analysis and practical molding should be decreased. This study presents reasons of the difference for the location of weld-line in the flow analysis and practical molding on automobile bumper molding.

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Two-Stage Design Optimization of an Automotive Fog Blank Cover for Enhancing Its Injection Molding Quality (자동차용 안개등 커버의 사출성형 품질 향상을 위한 2 단계 설계 최적화)

  • Park, Chang-Hyun;Ahn, Hee-Jae;Choi, Dong-Hoon;Pyo, Byung-Gi
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.8
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    • pp.1097-1103
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    • 2010
  • Injection pressure, an important factor in the filling procedure, should be minimized to enhance injection molding quality. In addition, warping deformation and weld lines, which are representative failures, should be avoided to enhance injection molding quality. To improve injection molding quality, the design procedure for an automotive fog blank cover is divided into two stages. In the first stage, we optimally obtain injection molding process variables that minimize injection pressure and warping deformation by using design of experiments, approximation and optimization techniques equipped in PIAnO (Process Integration, Automation and Optimization), a commercial PIDO (Process Integration and Design Optimization) tool. Then, we determine the thickness of the automotive fog blank cover that enables us to avoid generating weld lines. The design results we obtain in this study are found far better than those of the initial design, which demonstrates the effectiveness of our design method.

Study on Preform Design for Reducing Weight of PET Packaging Bottle (고분자 패키징 용기 중량 절감을 위한 프리폼 설계에 관한 연구)

  • Kim, Jeong-Soon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.1
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    • pp.1-6
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    • 2010
  • This study presents the preform injection molding and the blow molding of the injection stretch-blow molding process for PET bottles. The numerical analysis of the injection molding and the blow molding of a preform is considered in this paper using CAE with a view to minimize the warpage and the thickness. In order to determine the design parameters and processing conditions in injection/blow molding, it is very important to establish the numerical model with physical phenomenon. In this study, a three dimensional model has been introduced for the purpose and flow simulations of filling, post-filling and cooling process are carried out. The simulations resulted in the warpage in good agreement with the measurements. Also, from the result of numerical analysis, we appropriately predicted the warpage, deformation and thickness distribution along the product walls.

Comparison of Molding Characteristics for Multi-cavity Molding in Conventional Injection Molding and Injection Compression Molding (다수 개 빼기 성형에서 일반사출성형과 사출압축성형의 성형특성 비교)

  • Lee, Dan Bi;Nam, Yun Hyo;Lyu, Min-Young
    • Polymer Korea
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    • v.38 no.2
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    • pp.144-149
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    • 2014
  • Large residual stresses are remained in the conventional injection molded products because of the high cavity pressure in packing phase during injection molding process. Conventional injection molding (CIM) invokes distribution of cavity pressure and it has a limitation to obtain product with uniform physical property. Multi-cavity conventional injection molding contains quality deviation among the cavities since flow imbalance occurs during filling phase. Injection compression molding (ICM) is adopted to overcome these limitations of CIM. In this study, molding characteristics of CIM and ICM have been investigated using multi-cavity injection mold. Researches were performed by both experiment and computer simulation through observations of birefringence for transparent resins, polycarbonate and polystyrene in CIM and ICM. As a result, low and uniform birefringence and mold shrinkage were showed in the specimens by ICM that could give a uniform cavity pressure. Deviation of physical property among the specimens in multi-cavity mold shown in CIM was significantly reduced in the specimens by ICM. Through this study it was concluded that the ICM in multi-cavity molding was valid for molding products with uniform property in an individual cavity and also reduced property deviation among the cavities.

CAE Analysis on the Radius Curvature of Ununiformed wall-thickness Jar (불균일 측벽두께 Jar의 곡률반경에 따른 CAE 해석)

  • Shin, Nam-Ho;Choi, Seok-Jong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.6
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    • pp.1040-1046
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    • 2006
  • This paper is aimed to investigate the deformation caused by ununiform contraction of injection molding with highly big differences of thickness by the continuity of various curvature radius. By CAE analysis, the uniform cooling structure and optimum molding conditions are found for Jars made of SAN and PMMA materials and applied to the design of chill. In order toevaluate the molding pressure, resin temperature, molding temperature, cooling conditions, Moldflow program is applied. As results of experiments, the deformation and inferiority phenomena in Jars are analyzed for each factor and proposed the injection molding conditions to minimize the cooling structure and reduce the cycle time.

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