• Title/Summary/Keyword: Molding Die

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Effects of holding pressure affecting cooling time in injection molding (사출성형시 보압이 냉각시간에 미치는 영향)

  • Mun, Yeong-Bae;Choi, Yun-Sik;Jung, Yeong-Deuk
    • Design & Manufacturing
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    • v.2 no.1
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    • pp.39-43
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    • 2008
  • There occur not only many problems in the injection process but also low quality productivity due to the injection conditions of various injection factors. 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 the holding pressure affecting cooling time. Results of this study would be helpful to setting of holding pressure for optimization of forming condition in order to reduce cooling time in injection molding.

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Development of the ultra-high speed electric injection molding machine using the energy regeneration method (에너지 회생 기법을 사용한 초고속 전동 사출성형기 개발)

  • Yu, Hyeon-Jae;Yoo, Sung-Chul;Hyun, Chang-Hoon;Park, Kyoung-Ho
    • Design & Manufacturing
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    • v.10 no.2
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    • pp.1-5
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    • 2016
  • High-speed and high-torque performance is required in the ultra-high speed electric injection molding machine field. To implement this performance, the big-size inverter is needed and the corresponding converter should be used. In this case, the whole cost for configuring the system will be increased. In this paper, we introduce a method which is able to reduce the energy and the cost for configuring the system using the energy regeneration. The energy regeneration method is based on reusing the regeneration power generated at the electric motor during decelerating the injection motion. In this paper, we demonstrate the effectiveness of the method by using the ultra-high speed injection motion.

A Study on the Deflection of Large Mold for Injection Molding (대형 사출금형의 성형 시 발생하는 금형 휨에 관한 연구)

  • Hwang, Si-Hyun;Kim, Chul-Gyu;Shim, Soo-Kil;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.8 no.1
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    • pp.1-4
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    • 2014
  • Large injection molds commonly have molding defects such as flashes and variation of product thickness. In this study, we conducted injection molding CAE analysis to find out the cavity pressure and structural analysis to find out mold deflection as input load conditions injection pressure obtained from injection molding analysis. As the results from CAE analysis, we found which element is the most effective on the mold deflection and we suggested a mold design to minimize the mold deflection.

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Effects on the process factors of blow molding affects to the PET bottle (블로우 성형공정변수가 PET 용기에 미치는 영향에 관한 연구)

  • Kim, Jong-Dug;Go, Young-Bae;Kim, Ok-Rae;Park, Hyung-Pil;Kim, Hong-Ryul;Kwon, Chang-Oh
    • Design & Manufacturing
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    • v.2 no.6
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    • pp.7-10
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    • 2008
  • Injection-stretch blowing system for preform has been developed in this study. The preforms for injection blow molding and injection stretch blow molding are being manufactured by injection molding. However it contains gate mark that affects the bottom crack in the PET bottle. The compression molded preform does not contain gate mark, thus the appearance quality of bottle has been increased and the residual stress near gate(bottom of the bottle) has been reduced. The thickness distributions, haze, and transmittance are well accepted for the preform. Also, flow characteristics of the resin between a core and cavity could be analyzed through computer simulation.

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Effect of Boss Wall Thickness on Sink Mark in Injection Molding (보스 벽 두께가 사출성형의 싱크마크 발생에 미치는 영향)

  • Kim, H.P.;Kim, Y.J.
    • Design & Manufacturing
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    • v.6 no.1
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    • pp.5-11
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    • 2012
  • The sink mark on boss parts is generated by the volumetric shrinkage that is caused by both the molding thickness and the boss wall thickness. The volumetric shrinkage is caused by packing pressure and its amount tends to decrease by increasing the packing pressure. The packing pressure can therefore increase the flow rate to a boss part and causes the depth of sink mark to increase. As the molding thickness and the boss wall thickness in the boss part can increase the part volume, these may yield bad solidifying and also extend the molding cycle. In this paper, both the injection molding test and the flow analysis were carried out to investigate the effect of sink mark that was generated in the boss wall thickness of injection molded products. The sink mark could also be caused by thickness ratio of boss part. For a given thickness ratio of boss, several molding process parameters such as packing pressure, packing time and melt temperature, affecting to generation of the sink mark were discussed.

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Numerical study on the blowing deformation characteristics of a square shaped preform (사각 프리폼 블로우 성형 특성에 관한 수치적 연구)

  • Cho, Seung-Hyun;Song, Min-Jae;Lee, Dong-Won;KO, Young-Bae
    • Design & Manufacturing
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    • v.9 no.3
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    • pp.1-8
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    • 2015
  • 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, we appropriately predicted the warpage, deformation and thickness distribution along the product walls.

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A numerical study on blow molding for manufacturing PET bottle consisted of single body (손잡이 일체형 PET 용기 제작을 위한 블로우 성형에 대한 수치적 연구)

  • Kim, Jong-Duck;Go, Young-Bae;Kim, Hong-Ryul;Kwon, Chang-Oh
    • Design & Manufacturing
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    • v.2 no.3
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    • pp.22-27
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    • 2008
  • Forming of PET bottle was performed by injection-stretch blow molding. Blow molding is process of contacting the dies with air of materials by pressing. In this paper, the aim was to improve reliability of technical stabilization for the PET bottle that is last productive product and process technology which was able to do maximization by a preform performance enhancement of the uniform thickness that took temperature and a characteristic of materials. Preform design and dies manufacture were conducted using injection blow molding analysis results. Therefore thickness error of 5% for PET bottle can be obtained in this paper.

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A basic study on insert deformation characteristics of thin foil insert injection molding process (박판 Insert 사출성형시 Insert 변형 특성에 관한 기초 연구)

  • Jung, Woo-Chul;Shin, Gwang-Ho;Heo, Young-Moo;Yoon, Gil-Sang;Lee, Jeong-Won
    • Design & Manufacturing
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    • v.2 no.5
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    • pp.5-10
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    • 2008
  • Recently, ultra precision and light-weight micro products are needed in various industries. Injection molding products with metal insert material is often satisfied with light-weight and precision simultaneously. The researches on macro-size insert deformation have been performed but, a research on micro-size insert is meager. In this paper, the injection molding product with $300{\mu}m$ thin foil insert is designed and insert injection molding process is performed. Finally, the deformation of thin foil insert is analyzed according to insert feature and gate length.

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Development of double injection mold for fuel-tube holder (자동차 연료튜브 홀더용 이중사출 금형·성형기술)

  • Kim, Gun-Hee;Yoon, Gil-Sang;Heo, Young-Moo;Jung, Woo-Chul;Shin, Kwang-Ho
    • Design & Manufacturing
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    • v.1 no.1
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    • pp.1-5
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    • 2007
  • Double injection molding process is very efficient molding-method for molding the products which is consist of multi-materials. Fuel-tube holder which is necessary for automobil power train and circulation systems is composed of plastic and rubber materials to minimize the vibration and pulsation noises. In existing process, fuel-tube holder was made by the insert molding process or assembly process after molding. If fuel-tube holder is manufactured by double injection molding process, it may be realize to improve the product quality, efficiency of molding-process and retrenchment of manufacturing cost. In this study, for manufacturing fuel-tube holder by double injection molding process, the analysis of joining characteristics between PA6(polyamide 6) and TPE(thermoplastic elastomer) was executed and the double injectin mold for molding fuel-tube holder with core toggle mechanism was fabricated. Finally, fuel-tube holder was molding using fabricated double injection mold.

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