• Title, Summary, Keyword: Injection Molding

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A Study on the Effects of Filling and Packing Phases on the Injection Modeling (사출성형에 대한 충전과 보압과정의 영향에 관한 연구)

  • 김현필;김용조
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.112-118
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    • 2002
  • Injection molding process factors such as molding temperature, injection pressure, flow rate and flow velocity, must be controlled properly in filling and packing phases in the injection molding process. In this study, effects of these factors on the injection molding were investigated through the flow analysis fur the filling and packing phases. Molding troubles like flow mark, weld line, sink mark, short shot and warpage can be caused by these injection molding process factors. Among them, the short shot was caused by that the packing pressure could not reach properly to the filling end part in the packing phase and hence the flow rate could not be supplied to the full. In addition, as the flow rate for the volumetric shrinkage during the frozen phase could not be supplied properly by the packing pressure, the short shot appeared. Here, the volumetric shrinkage reduced with increasing the packing pressure and also the warpage of molded part increased with increasing the packing pressure.

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The Automatic Packaging System for 6mm Ball Injection Molding Product (6mm Ball 사출 성형품 자동 패키징 시스템)

  • Heo Y.M.;Shin G.H.;Yoon G.S.;Jang S.H.;Jung W.C.;Kim G.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.573-574
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    • 2006
  • In this study, the automatic packaging system for small injection molding product is developed. In most of injection molding company, many problems such as manpower problem, productivity decline and inferiority rate increase are occurred since processes after injection molding are executed by hands. The automatic system which is developed is for packaging small injection molding products as 6mm ball. Finally, many problems of injection molding process are resolved and the productivity will increase by applying developed system to field and this technique lays the groundwork for developing similar automatic system.

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Simulation and Experiment of Injection Molding Process for Superalloy Feedstock

  • Jung, Im Doo;Kim, Youngmoo;Park, Seong Jin
    • Journal of Korean Powder Metallurgy Institute
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    • v.22 no.1
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    • pp.1-5
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    • 2015
  • Powder injection molding is an important manufacturing technology to mass produce superalloy components with complex shape. Injection molding step is particularly important for realizing a desired shape, which requires much time and efforts finding the optimum process condition. Therefore computer aided engineering can be very useful to find proper injection molding conditions. In this study, we have conducted a finite element method based simulation for the spiral mold test of superalloy feedstock and compared the results with experimental ones. Sensitivity analysis with both of simulation and experiment reveals that the melt temperature of superalloy feedstock is the most important factor for the full filling of mold cavity. The FEM based simulation matches well the experimental results. This study contributes to the optimization of superalloy powder injection molding process.

A Study on Fuzzy Temperature Control for the Barrels of Injection Molding Machine using PC based PLC (PC 기반 PLC를 이용한 사출성형기 배럴의 퍼지 온도 제어에 관한 연구)

  • 김훈모
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.10
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    • pp.768-773
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    • 2003
  • Injection molding has been widely used for the mass production of a plastic product. With the development of the relative technique, various injection molding techniques have been developed and we could get more precise plastic product. The temperature of a melting resin is an important factor in the injection molding and this temperature has direct influence on the quality of a plastic product. In the present injection molding machine, the deriation of a temperature controlled by PID control method is within 2$^{\circ}C$ in the injection molding machine but PID control method takes too much time to stabilize after preheating and its overshoot is so big. We applied fuzzy control to alleriate the problem. In this research, we experimented the fuzzy temperature control with the usage of PC based PLC.

A Study on the Manufacturing Technology of the Aspheric Lens using Injection Molding (사출금형을 이용한 비구면 렌즈의 제조기술에 관한 연구)

  • Choi H. Z.;Lee S. W.;Kang E. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.76-83
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    • 2002
  • The injection molding of the plastic optics is basically same as the conventional molding except it requires very intricate control of all the molding processing parameters. In the plastic optics, the problem of injection molding is the shrinkage. The shrinkage must be removed and predicted. This shrinkage is becoming more important than any other problems in precision molding because it can affect the focal length of a lens or the total performance of the optical system. This study focused on avoiding the shrinkage that the mold design allows for the optics. In making mold, the surface accuracy(P-V) of the lower and lower mold are $0.201{\mu}m\;and\;0.434{\mu}m$ respectively. A surface roughness(Ra) is below $0.02{\mu}m$ due to selecting the appropriate tools and using the injection molding machine in high degree. In injection molding of the plastic lens, mold temperature, resine temperature and injecting pressure are important process parameters. Injection molding process is carried out according to varying mold temperature and injecting pressure. As a result P-V(peak to valley) of spheric lens is $3.478{\mu}m$ and that of aspheric lens is $1.786{\mu}m$.

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A Study on Improvement of Flow Characteristics for Thin-Wall Injection Molding by Rapid Mold Heating (급속 금형가열에 의한 박육 사출성형의 유동특성 개선에 관한 연구)

  • Park Keun;Kim Byung H.
    • Transactions of Materials Processing
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    • v.15 no.1
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    • pp.15-20
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    • 2006
  • The rapid thermal response (RTR) molding is a novel process developed to raise the temperature of mold surface rapidly to the polymer melt temperature prior to the injection stage and then cool rapidly to the ejection temperature. The resulting filling process is achieved inside a hot mold cavity by prohibiting formation of frozen layer so as to enable thin wall injection molding without filling difficulty. The present work covers flow simulation of thin wall injection molding using the RTR molding process. In order to take into account the effects of thermal boundary conditions of the RTR mold, coupled analysis with transient heat transfer simulation is suggested and compared with conventional isothermal analysis. The proposed coupled simulation approach based on solid elements provides reliable thin wall flow estimation for both the conventional molding and the RTR molding processes.

A Study on Injection Characteristic using Active Temperature Control of Injection mold (사출 금형의 능동형 온도제어에 따른 사출특성에 관한 연구)

  • Cho, C.Y.;Sin, H.G.;Hong, N.P.;Seo, Y.H.;Kim, B.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.302-305
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    • 2007
  • In recent years, many researches on new storage media with high capacity and information are developing. For manufacture of optical storage with high capacity, the injection molding process is generally used. In order to increase the filling ratio of the injection molding structure, the injection molding process required for high injection pressure, packing pressure and temperature control of the mold. However, conventional injection molding process is difficult to increase the filling ratio using injection master with the range of several nanometers and high aspect ratio. In order to improve and increase filling ratio of nano-structure with high aspect ratio, the active temperature control of injection mold was used. Experimental conditions were used injection pressure, time and temperature. Consequently, by using the peltier device into injection mold, we carried out the efficient and active temperature control of mold at low cost.

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A study on searching method of molding condition to control the thickness reduction of optical lens in plastic injection molding process (플라스틱 광학렌즈 사출성형에 있어서 수축 변형량 예측을 위한 사출성형 조건 탐색에 관한 연구)

  • 곽태수;오오모리히토시;배원병
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.2
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    • pp.27-34
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    • 2004
  • In the injection molding of plastic optical lenses, the molding conditions have critical effects on the quality of the molded lenses. Since there are many molding parameters involved in injection molding process, determination of the molding conditions for lens molding is very important in order to precisely control the surface contours of an optical lens. Therefore this paper presents the application of neural network in suggesting the optimized molding conditions for improving the quality of molded parts based on data of FE Analysis carried out through CAE software, Timon-3D. Suggested model in this paper, which serves to learn from the data of FE Analysis and induce the values for optimized molding conditions. has been implemented for searching the molding conditions without void and with minimized thickness shrinkage at lens center of injection molding optical lens. As the result of this study. we have confirmed that void creation at the inside of lens is primarily determined by mold temperature and thickness shrinkage at center of lens is primarily determined by the parameters such as holding pressure and mold temperature.

A Study on Influence of Parameters and Characteristics in the Injection Process on the Birefringence and Refractive Index for Pickup Lens (Pickup 렌즈의 사출조건이 복굴절 및 굴절율에 미치는 영향에 관한 연구)

  • Lee, Seung-Joon;Hyun, Dong-Hoon
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.21-28
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    • 2007
  • Injection molding process factors such as molding temperature, injection pressure, flow rate and flow velocity, must be controlled properly in filling and packing phases in the injection molding process. In this study, effects of these factors on the injection molding were investigated through the flow analysis for birefringence and refractive index for pickup lens. This paper presents the birefringence and refractive index reduced with increasing the holding pressure and also the holding pressure time. And there are interaction with birefringence and fill time in the injection process. The optimal conditions through DOE are validated by using injection molding analysis.

Injection Molding Experiments for Small Diameter Column (미소 원주의 사출 성형 실험)

  • 제태진;이응숙;김재구
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.85-88
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    • 1995
  • Recently, the micro mold maching techining technology is developed by means of the mechanical and high energy beam process. It is possible to make the micro structure mold with high aspect ratio by the LIGA technology. This mode is used for mass production of plastic parts by the micro injection molding method. In this study, we intend to research on the basic technology of micro injection molding. As the result, we developed the injection molding technology for small column plastic parts which diameter is 500 .mu. m and 200 .mu. m respectively with wbout aspect ratio 20.

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