• Title, Summary, Keyword: Heating and cooling injection mold system

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Development of High Rate Molding System for High Performance Injection Molding (고성능 사출성형을 위한 고효율 금형시스템 개발)

  • Kang, Hyung-Sun;Lee, Hong-Lae;Baek, Jong-Jin
    • Journal of Advanced Engineering and Technology
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    • v.11 no.3
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    • pp.165-169
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    • 2018
  • This is a study to solve the problems that occur in plastic injection molding. Temperature control of the mold in injection molding is very important because it is a heating and cooling operation and has a decisive influence on the productivity and merchantability of the product. We have developed a technology to uniform the resin density of the injection molding products by heating the mold temperature to high temperature within a short time and to develop the cooling speed and cooling temperature control system. A small test bed was made to test the heating and cooling performance, and the heating and cooling performance was tested by thermo-imaging the heating and cooling performance. It was applied to development molds and general molds. In the developed molds, there were no flowmark and weld lines that we wanted to improve.

Optimized Digital Proportional Integral Derivative Controller for Heating and Cooling Injection Molding System

  • Jeong, Byeong-Ho;Kim, Nam-Hoon;Lee, Kang-Yeon
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1383-1388
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    • 2015
  • Proportional integral derivative (PID) control is one of the conventional control strategies. Industrial PID control has many options, tools, and parameters for dealing with the wide spectrum of difficulties and opportunities in manufacturing plants. It has a simple control structure that is easy to understand and relatively easy to tune. Injection mold is warming up to the idea of cycling the tool surface temperature during the molding cycle rather than keeping it constant. This “heating and cooling” process has rapidly gained popularity abroad. However, it has discovered that raising the mold wall temperature above the resin’s glass-transition or crystalline melting temperature during the filling stage is followed by rapid cooling and improved product performance in applications from automotive to packaging to optics. In previous studies, optimization methods were mainly selected on the basis of the subjective experience. Appropriate techniques are necessary to optimize the cooling channels for the injection mold. In this study, a digital signal processor (DSP)-based PID control system is applied to injection molding machines. The main aim of this study is to optimize the control of the proposed structure, including a digital PID control method with a DSP chip in the injection molding machine.

A Study on Rapid Mold Heating System using High-Frequency Induction Heating (고주파 유도가열을 사용한 급속 금형가열에 관한 연구)

  • Jeong, Hui-Tack;Yun, Jae-Ho;Park, Keun;Kwon, Oh-Kyung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.5
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    • pp.594-600
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    • 2007
  • Rapid mold heating has been recent issue to enable the injection molding of thin-walled parts or micro/nano structures. Induction heating is an efficient way to heat a conductive workpiece by means of high-frequency electric current caused by electromagnetic induction. Because the induction heating is a convenient and efficient way of indirect heating, it has various applications such as heat treatment, brazing, welding, melting, and mold heating. The present study covers an experimental investigation on the rapid heating using the induction heating and rapid cooling using a vortex tube in order to eliminate an excessive cycle time increase. Experiments are performed in the case of a steel cup mold core with various heating and cooling conditions. Temperature is measured during heating and cooling time, from which appropriate mold heating and cooling conditions can be obtained.

Active Control of Injection Mold Temperature using the Peltier Device (펠티어 소자를 이용한 사출 금형의 온도제어)

  • Cho, C.Y.;Shin, H.G.;Park, D.Y.;Hong, N.P.;Kim, B.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.183-186
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    • 2007
  • The injection molding process has high accuracy and good reproducibility that are essential for mass production at low cost. Conventional molding processes typically use the water-based mold heating and air cooling methods. However, in the nano injection molding processes, this semi-active mold temperature control results in the several defects such as air-flow mark, non-fill, sticking and tearing, etc. Therefore, in order to control temperature of the molds actively and improve the quality of the molded products, the novel nano injection molding system, which uses active heating and cooling method, has been introduced. By using the Peltier devices, the temperature of locally adiabatic molds can be controlled dramatically and the quality of the molded patterns can be improved.

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Investigation of Cooling Performance of Injection Molds Using Pulsed Mold Temperature Control (가변 금형온도 제어기법을 적용한 사출금형의 냉각성능 고찰)

  • Sohn, Dong Hwi;Park, Keun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.1
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    • pp.35-41
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    • 2013
  • In injection molding, the mold temperature is one of most important process parameters that affect the flow characteristics and part deformation. The mold temperature usually varies periodically owing to the effects of the hot polymer melt and the cold coolant as the molding cycle repeats. In this study, a pulsed mold temperature control was proposed to improve the part quality as well as the productivity by alternatively circulating hot water and cold water before and after the molding stage, respectively. Transient thermal-fluid coupled analyses were performed to investigate the heat transfer characteristics of the proposed pulsed mold heating and cooling system. The simulation results were then compared with those of the conventional mold cooling system in terms of the heating and cooling efficiencies of the proposed pulsed mold temperature control system.

A method for Thermal Control of Nano Injection Molding using the Peltier Devices (펠티어 소자를 이용한 나노 사출 금형의 능동형 온도 제어)

  • Shin, H.;Kwon, J.;Hong, N.;Seo, Y.;Kim, B.
    • Transactions of Materials Processing
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    • v.17 no.5
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    • pp.337-342
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    • 2008
  • The injection molding process has high accuracy and good reproducibility that are essential for mass production at low cost. Conventional molding processes typically use the water-based mold heating and air cooling methods. However, in the nano injection molding processes, this semi-active mold temperature control results in the several defects such as air-flow mark, non-fill, sticking and tearing, etc. In order to actively control temperature of the molds and effectively improve the quality of the molded products, the novel nano injection molding system, which uses active heating and cooling method, has been introduced. By using the Peltier devices, the temperature of locally adiabatic molds can be controlled dramatically and the quality of the molded patterns can be improved.

A Study of Evaluation Technology for Heating Channel Layout in SMC Molds (SMC 금형의 가열채널레이아웃 평가기술에 관한 연구)

  • 이성희;고영배;이종훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.580-584
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    • 2004
  • In the present study, an evaluation technology for heating channel layout was investigated in SMC molding system design. Conventional design rules of cooling channel in injection molding process were applied to the present work. Finite element thermal analysis with ANSYSTM was performed to evaluate the temperature distribution of mold surface. SMC mold was manufactured to test the effect of a proposed heating channel layout system on the temperature distribution of mold surface and infrared camera was applied to a measurement of temperature. It was shown that infrared camera application was possible in a measurement of temperature distribution on mold surface.

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Beating Channel Layout Design and Evaluation Technology for SMC Molds (Sheet Molding Compound 금형의 가열채널설계 및 평가기술)

  • Heo Y. M.;Ko Y. B.;Lee J. H.;Lee S. H.
    • Transactions of Materials Processing
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    • v.14 no.3
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    • pp.263-268
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    • 2005
  • Heating channel layout design and evaluation technology for SMC molding system was investigated in this work. Traditional rules of cooling channel design in injection molding were applied to the present work. Finite element thermal analysis with $ANSYS^{TM}$ was performed to evaluate the temperature distribution of SHC mold surface. SMC mold was manufactured to evaluate the effect of a proposed heating channel layout system on the temperature distribution of SMC mold surface and infrared camera was applied to a measurement of temperature distribution. It was shown that infrared camera application was possible in a measurement of temperature distribution on SHC mold surface.

A Study on Plastic Injection Molding of a Metallic Resin Pigment using a Rapid Heating and Cooling System (급속가열냉각장치에 의한 금속성 안료 사출성형)

  • Lee, Gyu-Sang;Jin, Dong-Hyun;Kwak, Jae-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.87-92
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    • 2015
  • The injection molding process is widely used in the production of most plastic products. In order to make metal-colored plastic products like those found in modern luxury home alliances, metallic pigments are mixed with a basic resin material for injection molding. However, process control for metal-colored plastic products is extremely difficult due to the non-uniform melt flow of the metallic resin pigments. In this study, the effect of process parameters on the quality of a metal-colored plastic product is evaluated. A rapid mold cooling method using a compressed cryogenic fluid is also proposed to decrease the content of undesired compounds within the plastic product.