• Title, Summary, Keyword: 사출성형 해석

Search Result 275, Processing Time 0.039 seconds

A Study on the Injection Molding Process of Inline Skate Frame Using Moldflow (Moldflow를 이용한 인라인스케이트 프레임의 사출성형공정에 관한 연구)

  • Lee, Hyoung-Woo;Park, Chul-Woo
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.34 no.2
    • /
    • pp.289-295
    • /
    • 2010
  • Injection molding process is one of the most important methods to produce plastic parts with high efficiency and low cost. Today, injection molded parts have been increased dramatically the demand for high strength and quality applications. In this study, In-line skates are made of Al alloy and plastic materials to replace the frame for the optimization process is all about. I interpreted through mold design, Injection molding process that minimizes the runner and the gate dimension will determine the size and shape. Runner and gate dimensions of change based on availability of the product, I'll discuss the injection molding. This report investigates that the optimum injection molding condition for minimum of shrinkage. The FEM Simulation CAE tool, Moldflow, is used for the analysis of injection molding process.

Design and Analysis of Shell Runners to Improve Cooling Efficiency in Injection Molding of Subminiature Lens (초소형 렌즈 사출성형시 냉각효율 향상을 위한 박판형 러너의 설계 및 해석)

  • Yoon, Seung Tak;Park, Keun
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.39 no.10
    • /
    • pp.1021-1028
    • /
    • 2015
  • Subminiature lenses are currently widely used in mobile phone cameras and are usually produced by injection molding. The lens molding process has the unique feature of a runner volume that is much larger than the part volume, and this feature should be considered when determining the mold design and molding conditions. In this study, a shell-type runner was proposed as an alternative to the conventional cylindrical runner used for lens molding. An injection molding simulation was performed by applying the proposed shell runner, and the simulation results were compared with those from the cylindrical runner case. It was found that the shell runner could considerably reduce the runner cooling time with only a slight increase in the injection pressure. The effect of the runner thickness was then investigated numerically in terms of the mold filling and cooling characteristics, from which an optimal runner thickness could be determined.

Fabricaton of PEMFC separators with conducting polymer composites by injection molding process and evaluation of moldability and electrical conductivity of the separators (전도성 복합재료를 이용한 PEMFC용 separator 사출성형 제조 및 전기전도성 평가)

  • Yoon, Yong-Hun;Lim, Seung-Hyun;Kim, Dong-Hak
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.11 no.4
    • /
    • pp.1361-1366
    • /
    • 2010
  • This research aims to develop polymer composites which can be used for PEMFC separators by injection molding process. Considering the moldability and stiffness, we used PPS(Poly(phenylene sulfide)) and PP(Polypropylene) as base resin. In order to improve electrical conductivity and physical properties, we chose glass fiber, carbon fiber, carbon black, and both expanded graphite and synthetic graphite. The 3 type composites are prepared for injection molding of PEMFC separators. and CAE(Computer Aided Engineering) analysis was conducted to optimize injection processing parameters(injection pressure, heat time, mold temperature etc.). We did successfully fabricate the separators by injection molding, and measure the electrical conductivity of the samples by using four point probe device. Conclusively, PP/SG/CB composite showed better both electrical conductivity and moldability than the others.

Thermal-Fluid Coupled Analysis for Injection Molding Process by Considering Thermal Contact Resistance (사출금형의 열접촉 저항을 고려한 성형과정의 열-유동 연계해석)

  • Sohn, Dong-Hwi;Kim, Kyung-Min;Park, Keun
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.35 no.12
    • /
    • pp.1627-1633
    • /
    • 2011
  • Injection molds are generally fabricated by assembling a number of plates in which the core and cavity components are assembled. This assembled structure has a number of contact interfaces where the heat transfer characteristics are affected by thermal contact resistance. In previous studies, numerical approaches were investigated to predict the effect of thermal contact resistance on the temperature distribution of injection molds. In this study, thermal-fluid coupled numerical analyses are performed to take into account the thermal contact effect on the numerical evaluation of the mold filling characteristics. Comparisons with experimental results show that the proposed coupled analysis provides more reliable results than the conventional analyses in predicting the mold filling characteristics by taking into account the effect of thermal contact resistance inside the injection mold assembly.

A Study on the Injection Molding Analysis of the Metal Powder Material (금속분말재료의 사출 성형해석에 관한 연구)

  • Ro, Chan-Seung;Park, Jong-Nam;Jung, Han-Byul
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.18 no.10
    • /
    • pp.42-47
    • /
    • 2017
  • In this study,we conducted an injection molding analysis of metal powder materials for the development of flanges, which are necessary adapters for optical communication. The metal powder injection molding process is a technique for producing an injection molded article having a complicated shape by mixing ceramic or stainless powder and binders. It is used to produce products which require complex processing technology or for which the productivity is low. The purpose of this study is to minimize the manufacturing processing of products which are manufactured through existing mechanical processing procedures. For the injection molding analysis, we mixed stainless STS316 metal powder with binders at a ratio of 6 to 4 to make molding materials consisting of granular pellets. Then, three-dimensional modeling and meshing were carried out to obtain the optimal injection molding analysis conditions(molding temperature, melting temperature, injection time, injection temperature, injection pressure, packing time and cooling time). As a result of the analysis, it was discovered that the inlet became available 13.29 seconds after the first injection. Also, as the flowing and packing in the melt through the sprue, runner and gate were stable, it is expected that good molds can be manufactured.

Numerical Simulation of Injection Molding Filling Process of Short-Fiber-Reinforced Thermoplastics (단섬유보강 플라스틱재료의 사출성형 충전공정 수치해석)

  • 권태헌
    • The Korean Journal of Rheology
    • /
    • v.5 no.2
    • /
    • pp.109-124
    • /
    • 1993
  • 본 연구의 목표는 임의의 3차원 사출성형 금형 공간내에서 단섬유 강화 플라스틱의 충전 공정에서의 과도기적 섬유방향성을 예측하는 수치해석 프로그램의 개발에 있다. Hele-Shaw 방정식에 단섬유에 의해서 추가된 응력을 고려한 Dinh-Armstrong의 모델을 도 입함으로써 새로운 충전과정의 압력 지배 방정식이 유도되었다. 새로운 압력지배 방정식은 단섬유에 의한 응력 때문에 몇 개의 새로운 항들을 포함하고 있다. 충전 과정의 해석은 새 로운 압력지배방정식과 에너지 방정식을 유한효소법과 유한 차분법을 이용하여 풀고 동시에 배향텐서(roientation tensor)의 변화 방정식을 4차 Runge-Kutta 방법을 이용하여 풀었다. 단섬유 배향 텐서를 텐서의 변환 법칙을 이용하여 임의의 3차원 금형 공간내의 모든유한요 소의 중심에서 두께방향의 모든유한 차분 격자를 따라 계산하였다. 이러한 방법으로 임의의 3차원 사출성형 금형 공간내에서 비등온 충전유동과 과도기적 3차원 섬유배향상태를 서로의 상호작용을 고려하여 수치 모사하여 다양한 유동 형태에 따른 단섬유 배향 상태의 변화에 대하여 알아보고자 한다.

  • PDF

Optimization of Process Parameters of Die Slide Injection by Using Taguchi Method (다구치 법을 통한 다이슬라이드식 사출성형의 공정파라미터 최적화)

  • Jeong, Soo-Jin;Moon, Seong-Joon;Jeoung, Sun-Kyoung;Lee, Pyoung-Chan;Moon, Ju-Ho
    • Korean Chemical Engineering Research
    • /
    • v.50 no.2
    • /
    • pp.264-269
    • /
    • 2012
  • Die slide injection marvelously reduces the cost and time in processing plastic products because they can simplify the conventional process through eliminating additional process. However, this process must resolve some defects like whitening, resin infiltration, blowhole, resin overflow, etc. In this study, the process parameters of the injection molding are optimized by using the finite element method and Taguchi method. The injection molding analysis is simulated by employing the Moldflow insight 2010 code and the 2nd injection is by adopting the Multi-stage injection code. The process parameters are optimized by using the $L_{16}$ orthogonal array and smaller-the-better characteristics of the Taguchi method that was used to produce an airtight container (coolant reservoir tank) from polypropylene (PP) plastic material.rodanwhile, the optimum values are confirmed to be similar in 95% confidence and 5% significance level through analysis of variance (ANOVA). rooreover, new products and old products were compared by mdasuring the dimensional accuracy, resulting in the improvement of dimensional stability more than 5%.

Study on numerical analysis and experiment of the injection/ blow molding of a preform of PET Bottle (페트용기 성형을 위한 프리폼 사출성형 및 블로우 성형의 실험 및 해석에 관한 연구)

  • Kim, Jeong-Soon;Kim, Jong-Deok;Kim, Ok-Rae;Kwon, Chang-Oh
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.9 no.5
    • /
    • pp.1119-1124
    • /
    • 2008
  • 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.

A Study on Hopper Design for Minimizing the Wrapage Deformation at Injection Molding Processes (사출공정에서 휨 변형을 최소로 하는 호퍼 설계 연구)

  • Kim, Young-Suk;Lee, Eui-Joo;Son, Jae-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.1
    • /
    • pp.35-42
    • /
    • 2015
  • Injection molding is a high efficient manufacturing technology for producing plastic parts. On the other hand, the warpage of molded plastic parts is an ubiquitous problem in the injection molding process. The main objective of this study was to minimize the amount of warpage occurring in the injection molding process of a hopper of ATDPS made of crystalline polymer (PP) instead of amorphous polymer (ABS). The moldflow CAE simulation was conducted for the molding process of the hopper to clarify the injection moldability, shear rate, shear stress, warpage by changing the gate shape and the number of ribs installed on the top of the hopper flange. The wide gate shape of runner system and multiple rib installation were found to be useful for minimizing the warpage of the hopper. The validity of the CAE simulations was supported by the injection molding experiment for the optimized design case.