• Title/Summary/Keyword: Hot-runner

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A Study on the Filling Imbalances between Multi-Cavity in Hot-Runner Mold (핫러너 금형에서 다수 캐비티 사이에 발생하는 충전불균형에 관한 연구)

  • Han Seong Ryeol;Kang Chul Min;Han Kyu Taek;Jeong Yeong Deug
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9 s.174
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    • pp.173-178
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    • 2005
  • Recently plastic parts are molded for the purpose of mass production in multi-cavity system. Therefore, designer is usually designing mold that has geometrically balanced runner lay-out for filling balance at each cavity. Although, mold is manufactured with geometrically balanced runner lay-out, there are actually filling imbalances in the cavities. These filling imbalances phenomenon are caused by complicated interaction between melt and mold. In this study, based on previous studies for filling imbalances in cold-runner mold, filling imbalances in hot-runner mold were investigated by CAE and injection molding experiments. ABS and PMMA as amorphous polymer, PA as crystalline polymer were used to compare the filling imbalances. There were different results of CAE and experiment. The filling imbalances decreased as injection rate increased without regard to kind of resins and were lower than the one of cold-runner.

A Study on the Filling Imbalances between Multi-Cavity in Hot-Runner Mold (핫러너 금형에서 캐비티사이의 충전불균형 현상에 관한 연구)

  • Han S.R.;Jeong Y.D.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.598-601
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    • 2005
  • Plastic parts are molded for the purpose of mass production in multi-cavity system. Therefore, designer is usually designing molds that has geometrically balanced runner lay-out for filling balance at each cavities. Although, mold is manufactured with geometrically balanced runner lay-out, there are actually filling imbalances in cavities. These filling imbalances phenomenon are caused by complicated interaction between melt and mold. In this study, based on previous studies for filling imbalances in cold-runner mold, filling imbalances in hot-runner mold were investigated by CAE and injection molding experiments. ABS, PMMA as amorphous polymer and PA, PP as crystalline polymer were used to compare the filling imbalances. The filling imbalances decreased as injection rate increased without regard to kind of resins and were lower than the one of cold-runner.

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A study on the filling imbalances in hot-runner mold for internal gear based on injection molding (내측 기어 성형용 핫러너 금형에서의 충전불균형에 관한 연구)

  • No, Byung-Soo;Jea, Duck-Gun;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.2 no.3
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    • pp.1-5
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    • 2008
  • Plastic parts are molded for the purpose of mass production in injection molding. Therefore designer is usually designing molds that has geometrically balanced hot runner lay-out for filling balance at cavities. Although, mold is manufactured with geometrically balanced runner lay-out, there are actually filling imbalances in cavities. These filling imbalances phenomenon are caused by complicated interaction between melt and mold. In this paper, filling imbalances for internal gear based on injection molding in hot-runner mold were investigated by CAE and injection molding experiences.

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CAE Analysis and Optimization of Injection Molding for a Mobile Phone Cover (휴대폰 커버 사출성형의 CAE 해석 및 최적화)

  • Park, Ki-Yoon;Kim, Hyeon-Seong;Kang, Jin-Hyun;Park, Jong-Cheon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.60-65
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    • 2012
  • This paper deals with an CAE analysis and optimization of injection molding for a mobile phone cover. Two design goals are established in the optimization; one is to switch over the feed system from cold runner to hot runner for the purpose of reducing material costs, and the other is to minimize the warpage in order to improve product quality. By the full-factorial experiments for design parameters, we showed that the cold runner design could be changed to the hot runner design by replacing the current resin with a new resin of higher fluidity. In addition, we could significantly reduce the warpage of the cover product under the hot runner system by optimizing packing pressure and packing time.

A Closed-loop-control System for Filling Balance in the Hot Runner Mold with Multi-Cavities (다수 캐비티를 갖는 핫러너 금형에서의 균형충전을 위한 자동제어시스템)

  • Jang, Min-Kyu;Jo, Il-Kyu;Lee, Ok-Seong;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.9 no.1
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    • pp.23-26
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    • 2015
  • For mass production of plastics, injection molds have multi-cavities. However, filling imbalance between cavity to cavity always has occurred in multi-cavities mold, and this has caused low quality of plastics part. In this study, the closed-loop-control system which can control temperature of hot manifold and nozzle in hot runner mold for filling balance has been suggested, and a series of experiment about difference of filling time and weight in cavity-to-cavity was conducted. As a result of using closed-loop-control system, a remarkable improvement in reducing filling imbalance was confirmed.

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On the new mold structure with multi-point gate for filling-balance mold (다점 핀포인트 금형에서 균형충전이 가능한 사출금형 구조)

  • Kwon, Youn-Suk;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.2 no.5
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    • pp.25-29
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    • 2008
  • Almost all injection molds have multi-cavity runner system for mass production, which are designed with geometrically balanced runner system in order to accomplish filling balance between cavity to cavity during processing. However, even though geometrically balanced runner is used, filling imbalance have been observed. Filling imbalance could be decreased by modifying processing conditions such as injections rate, mold temperature, injection pressure, melt temperature that are related to shear, viscosity. In this study, a series of experiment was conducted to investigate filling imbalance variation when modifying runner layout and ploymer and to determine which processing condition influences as the primary cause of filling imbalance in geometrically balanced runner system. The filling imbalance was desreased up to result range of $3{\leq}DFI{\leq}8(%)$ by using a new runner system for balanced filling.

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자동차 범퍼 금형에서 밸브게이트 시스템 적용에 관한 연구

  • 황시현;김명기;정영득
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.115-115
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    • 2004
  • 최근에는 자동차용 범퍼(Bumper), 인판넬(In-panel), 도어판넬(Door panel), 도어가니쉬(Door Garnish) 등과 같은 대형 사출성형품을 성형하기 위한 금형설계에 핫 러너 시스템(Hot Runner System)에 밸브 게이트(Valve Gate)를 채용한 밸브 게이트 시스템을 많이 사용하고 있다 이 시스템을 사용함으로서 성형 싸이클타임의 단축, 수지 스크랩의 감소 등의 말은 장점이 있으나, 실제 성형작업 적용 시 밸브 게이트의 작동순서 및 개폐시간의 제어 등에 정확한 표준이 없어 시험 사출시 최적 성형조건의 셋팅이 많은 시간을 소모하고 있는 문제점이 있다.(중략)

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On the new mold structure with multi-point gate for filling-balance mold (사출성형시 불균형 충전에 관한 다구찌 실험계획법을 이용한 성형공정의 최적화)

  • Hong, Youn-Suk;Han, Dong-Hyup;Jeong, Yeong Deug
    • Design & Manufacturing
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    • v.1 no.1
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    • pp.13-16
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    • 2007
  • Almost all injection molds have multi-cavity runner system for mass production, which are designed with geometrically balanced runner system in order to accomplish filling balance between cavity to cavity during processing. However, even though geometrically balanced runner is used, filling imbalance have been observed. Filling imbalance could be decreased by modifying processing conditions such as injections rate, mold temperature, injection pressure, melt temperature that are related to shear, viscosity. In this study, a series of experiment was conducted to investigate filling imbalance variation when modifying runner layout and polymer and to determine which processing condition influences as the primary cause of filling imbalance in geometrically balanced runner system.

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