• Title/Summary/Keyword: Cold-runner

Search Result 10, Processing Time 0.024 seconds

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
    • /
    • v.22 no.9 s.174
    • /
    • pp.173-178
    • /
    • 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
    • /
    • 2005.06a
    • /
    • pp.598-601
    • /
    • 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.

  • PDF

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
    • /
    • v.11 no.2
    • /
    • pp.60-65
    • /
    • 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.

Degree of Filling Balance according to Runner Shapes in Injection Mold (사출금형의 러너시스템 형상에 따른 균형 충전도)

  • Han, Dong-Yeop;Jeong, Yeong-Deug
    • Design & Manufacturing
    • /
    • v.6 no.1
    • /
    • pp.52-57
    • /
    • 2012
  • Aspect of filling imbalance that is originated from imbalanced share rate in runner is changed by material property, runner layout that are factors of changing viscosity and by injection pressure, injection speed, melt temperature and mold temperature that are injection conditions. In this paper, we made a study of runner system that is one of factor of filling imbalance and Sharp Conner Effect and Groove Corner Effect that are recently released. The study are showed that filling rate of between inside and outside cavity was influenced on shape of runner. Also, we suggested runner system for filling imbalance by adapting the two effects at multi cavity of unary branch type and theoretical investigated flow in the Shrap Conner runner type.

  • PDF

Studies on the Relationship of the Cold Resistance Rating with Growth in the Nursery Stage in Rape (유채내한성 계통들의 묘소질과 형태와 월동비육 생육 및 수량과의 관계)

  • 권병선;김관수
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.24 no.2
    • /
    • pp.105-108
    • /
    • 1979
  • Compared with ordinary varieties, the cold resistant lines were heavy in fresh weight of seedling, low in stalk elongation. Their leaf-types were complete runner types, and they were high in wintering rate, and were abundant in the branch number and in pod numbers per branch. They were high in the seed yield.

  • PDF

A Study on the Inner Temperature Behaviors in the Casting Process for the Development of the Automatic Parts (자동차 부품 소재 개발에 따른 캐스팅 과정의 부품 내부온도 거동에 관한 연구)

  • Cha Young-Hoon;Sung Back-Sub;Jang Hoon;Kim Mi-Ai;Kim Jung-Dae;Kim Sun-Jun;Kim Duck-Joong;Lee Youn-Sin
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.10a
    • /
    • pp.279-284
    • /
    • 2005
  • The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. In this thesis, the computer simulation analyzed the flow of molten metal. The quantitative analyses which proposed the effective mold design was executed Flow patterns of 0.15-0.16m/s molten metal in 15 mm thin plate casting were investigated in order to optimize die-casting process. As increasing ingate velocity in thin plate casting, cold shot was decreased. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile valve body mid-plate have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.

  • PDF

Development of Wasteless Mold for rubber molding Part (고무 성형제품의 Wasteless 금형 개발에 대한 연구)

  • Choi N.J.;Huh Y.M.;Kang S.S.;Park S.B.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2004.05a
    • /
    • pp.101-104
    • /
    • 2004
  • The application of rubber produt is a quite extensive field and has several problems in point of mass-production. The inhibitive factors at the general rubber mold are occurrence of flash, loss of raw material by curing for sprue and runner, environmental pollution by scrap junked after extraction of product and the unavailable mold structure for automation. The existence of flash at the rubber mold requires extra-process for removing or finishing it. As the reason, we can't help avoiding deterioration of quality and rising of cost. Hence we promptly need to research fur the efficient structure of mold and the preventive transforming technique of the flash without any loss of raw material in advance. This monograph is a study for Wasteless rubber mold that give us a solution for several problems happened at the general rubber mold.

  • PDF

A Study on the Moulding Analysis of Automobile Valve Body Mid-plate (자동차 밸브바디 중간플레이트 성형해석에 관한 연구)

  • Jang Hun;Sung Back-Sub;Cha Yong-Hoon;Kim Duck-joong;Lee Youn-sin
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2005.05a
    • /
    • pp.174-179
    • /
    • 2005
  • In the super slow speed die casting process, the casting defects due to melt flow should be controlled in order to obtain sound casting products. The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. The calculation of simulation can produce very useful and important results. The calculation data of die casting process condition from the computer simulation by the Z-CAST is made to insure that the liquid metal is injected at the right velocity range and that the filling time is small enough to prevent premature solidification. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile valve body mid-plate have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.

  • PDF

A study on the injection molding technology for thin wall plastic part (초정밀 박육 플라스틱 제품 성형기술에 관한 연구)

  • Heo, Young-Moo;Shin, Kwang-Ho
    • Design & Manufacturing
    • /
    • v.10 no.2
    • /
    • pp.50-54
    • /
    • 2016
  • In the semiconductor industry the final products were checked for several environments before sell the products. The burning test of memory and chip was implemented in reliability for all of parts. The memory and chip were developed to high density memory and high performance chip, so circuit design was also high integrated and the test bed was needed to be thin and fine pitch socket. LGA(Land Grid Array) IC socket with thin wall thickness was designed to satisfy this requirement. The LGA IC socket plastic part was manufacture by injection molding process, it was needed accuracy, stiffness and suit resin with high flowability. In this study, injection molding process analysis was executed for 2 and 4 cavities moldings with runner, gate and sprue. The warpage analysis was also implemented for further gate removal process. Through the analyses the total deformations of the moldings were predicted within maximum 0.05mm deformation. Finally in consideration of these results, 2 and 4 cavities molds were designed and made and tested in injection molding process.

Molding Analysis for the Production of Large Sun Visors in Vehicles (차량용 대형 선바이저 생산을 위한 성형해석)

  • Park, Jong-Nam;Noh, Seung-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.17 no.11
    • /
    • pp.610-615
    • /
    • 2016
  • Diverse accessories are used in automobiles, such as navigation systems, front and rear cameras, spoilers, and sun visors. Sun visors block sunlight so that drivers can drive safely with a better view, and they are used in many automobile designs. However, when large plastic products are manufactured using injection molding, there are many difficulties that develop, like weld lines, short shots, flow marks, imperfections, and distortion. In this study, a CAE simulation was conducted based on previous results to predict potential problems in the injection molding of large products. The flow characteristics up to complete charge for the melting resins were captured using a computer-aided engineering simulation. The temperature departure on the front part of a flow was about $10^{\circ}C$ and very stable. The practical ejecting time of the cold runner was about 70 seconds in the simulation. Finally, the capability of a suitable injection machine was calculated and recommended by prediction of the injection pressure and the die clamping force.