• Title/Summary/Keyword: 다수 캐비티 금형

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A New Runner System for Filling Balance in the Multi-Cavities Molds (다수 캐비티에서의 균형충전을 위한 새로운 러너 시스템)

  • Jang, Min-Kyu;Park, Tae-Won;Jeong, Yeong-Deug
    • 한국금형공학회:학술대회논문집
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    • 2008.06a
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    • pp.95-98
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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 imbalances have been observed. So, many studies for improving filling balance in the multi-cavities molds are worked up. In this study, the Melt-Buffer which is a new runner system for filling balance has been suggested, and a series of experiment about degree of filling balance in cavity-to-cavity was conducted in the mold with the Melt-Buffer. From the experiment, the filling balance was increased up to $5^{\sim}6%$ by using the Melt-Buffer.

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A study on multi-cavity injection mold and molding elemental technology for plastic product of high precision tolerance (고정밀 플라스틱 제품 성형을 위한 다수 캐비티 사출금형 및 성형 요소기술에 관한 연구)

  • Jong-In Son;Chul-Ki Kim;Byeong-Uk Song
    • Design & Manufacturing
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    • v.17 no.4
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    • pp.57-62
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    • 2023
  • As a representative method for mass production, a multi-cavity type mold capable of simultaneously molding products of the same shape can be applied. It has the advantage of improving the productivity from several times to several tens of times, but it may cause disadvantages which is the quality deviation with each cavity. This study, therefore, has tried to increase the cavity filling balance by using a melt flipper and a flow distance control part in the runner part of the mold. Along with this, the design and manufacturing of air vents during injection molding have been verified through experimental methods to achieve a higher level of multi-cavity filling balance and dimensional accuracy.

Effects of processing Factors on Filling Imbalances in Multi-cavity Injection Mold. (다수 캐비티 사출금형에서 성형 인자가 충전 불균형에 미치는 영향)

  • Kang C. M.;Jeong Y. D.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.54-57
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    • 2004
  • Almost all injection molds have multi-cavity runner for mass production, which are designed with geometrically balanced runner system in order to minimize filling imbalance between cavity to cavity during processing. However, even though geometrically balanced runner is used, filling imbalances have sometimes been observed. These filling imbalances have historically been considered as result of uneven mold temperature and mold deflection, but it actually results from non-symmetrically shear, pressure, temperature distribution within melt material as it flows through the runner system. Filling imbalance could be decreased by modifying processing conditions that are related to shear, pressure, temperature such as injection rate, mold temperature, injection pressure, melt temperature. In this study, a series of experiment was conducted using Taguchi method to determine which processing condition influence as the primary cause of filling imbalance in geometrically balanced runner system. As a result of experiments, this paper could present an optimal processing condition to minimize variable that brings about filling imbalance geometrically balanced runner system

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Filling Imbalance in 3 Plate Type Injection Molds with Multi-Cavity (다수 캐비티를 갖는 3매 구성 사출금형에서의 충전 불균형)

  • 제덕근;정영득
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.117-121
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    • 2004
  • Injection molding is the one of the most important processes for mass production of plastic parts. Usually injection molds for mass production are constituted to multi-cavity runner system to manufacture the more parts at a time. Multi-cavity molds are designed to geometrically balanced runner system to uniformly fill to each cavity. But, when injection molding is performed using a mold with balanced runner system filling imbalances are occurred between the cavity to cavity. The previous studies by Beaumont at. all reported that filling imbalance occurred by thermal unbalance on the mold and viscosity variation of resins and so on. In this study, we conducted experiments in order to know the causes of filling imbalance for 3 plate type mold with 8 cavities. And we exhibited a new so called 4BF mold (4 plate type Balanced Filling Mold) to be possible filling balance. We conducted a experimental injection molding to verify the efficiency of the 4BF mold. In the results of the experiment, we could confirmed the balanced filling possibility of the 4BF mold.

The Filling Imbalance in Multi-Cavity Injection Molds with Unary Branch Type Runner Lay-out (편측 분기형 러너 배열을 가진 다수 캐비티 사출금형에서의 충전 불균형도)

  • 강철민;정영득
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10a
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    • pp.72-75
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    • 2003
  • Almost all injection molds have multi-cavity runner system for productivity and are designed with geometrically balanced runner system in order to minimize filling imbalance between cavity to cavity during processing. However, filling imbalances have been observed though geometrically balanced runner lay-out are used. Generally, these filling imbalances are due to thermal unbalance, viscosity, characteristic of polymers and so on. These kinds of filling imbalances has already been reported by Beaumont[1] since 1997. In this study, we presented filling imbalaces in balanced runner that has unnary branch type lay-out through experimental tests. As a result of experiments, we could present the processing conditions for the balanced filling in geometrically balanced runner that has unnary branch type lay-out

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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.

Effects of Core Pin Shape on the Filling Imbalances of PA6 Molding (러너 코어핀 형상이 PA6 성형품의 충전불균형도에 미치는 영향)

  • Jeong Y.D.;Kang C.M.;Je D.K.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.706-709
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    • 2005
  • Despite geometrical balanced runner system, filling imbalances between cavity to cavity have always been observed in multi-cavity injection mold. These filling imbalances are results from non-symmetrical shear rate distribution within melt as it flows through the runner system. It has been possible to decrease filling imbalance by optimizing processing conditions, but it has not completely eliminated this phenomenon during the injection molding processing. This paper presents a solution of these filling imbalances by using runner core pin which creates a symmetrical shear distribution within runner and the effects on filling imbalance when modifying a shape of runner core pin. As a result of using runner core pin, a remarkable improvement in reducing filling imbalance was confirmed. In addition we investigated how filling imbalances were affected by shape of runner core pin.

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Development of New Runner System for Filling Balance in Multi Cavity Injection Mold (다수 캐비티 사출금형에 적용되는 새로운 균형 충전용 러너 시스템 개발)

  • Jeong Y. D.
    • Transactions of Materials Processing
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    • v.15 no.1 s.82
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    • pp.42-46
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    • 2006
  • For mass production, usually injection mold has multi-cavity which is filled through geometrical balanced runner system. Despite geometrical balanced runner system, filling imbalances between cavity to cavity have always been observed. These filling imbalances are one of the most significant factors to affect quality of plastic parts. Filling imbalances are results from non-symmetrical shear rate distribution within melt when it flows through tile runner system. It has been possible to decrease filling imbalance by optimizing processing conditions, but it has not completely eliminated this phenomenon during injection molding processing. This paper presents a solution for these filling imbalances by using Runner Core pin (RC pin). The Runner Core pin which is developed in this study creates a symmetrical shear distribution within runner. As a result of using Runner Core pin, a remarkable improvement in reducing filling imbalances was confirmed.

Filling Imbalance of Elastomer TPVs in Injection Mold with Multi-Cavity (다수캐비티 사출금형에서 엘라스토머 TPV의 충전 불균형)

  • Han, Dong-Yeop;Kwon, Yun-Suk;No, Byeong-Su;Jeong, Yeong-Deug
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.2 s.191
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    • pp.41-46
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    • 2007
  • Recently, the study for filling imbalance in thermoplastic polymer has gradually been increased. However, it is hard to find the researches for filling imbalance of thermoplastic elastomer(TPE). The experiment of filling imbalance was conducted for the three kinds of thermoplastic vulcanizes(TPVs) in the mold with geometrically balanced runner system. In this experiment, the effects of the melt temperature and injection speed on the filling imbalance were investigated. To solve the filling imbalance, Runner Core pin(RC pin) in the experimental mold was adopted and it's effects was tested. In this paper, we present that the insert length of RC pin is dependent to each polymers for optimal filling balance.

A Study on the Filling Balance of Elastomer TPVs in Multi-Cavity Injection Mold (다수 캐비티 금형에서 엘라스토머 수지의 균형충전도 연구)

  • No B.S.;Han S.R.;Han D.Y.;Jeong Y.D.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.407-408
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    • 2006
  • Almost all injection molds have multi-cavity, which are designed with geometrically balanced runner system in order to made filling balance between cavity to cavity during injection molding. However, filling imbalance has been existed in the geometrically balanced runner system. In this study, we made an experiment and surveyed that are filling balanced variation according to molding condition with thermoplastic vulcanizate (TPV). Also, we conducted experiments in order to know the influence of filling balance for runner core pin (RC pin).

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