• Title, Summary, Keyword: Injection Speed

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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
    • Journal of the Korea Society of Die & Mold Engineering
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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.

Measurement of Viscosity and Numerical Analysis of High Speed Injection Molding for Thin-Walled LGP (박형 도광판의 고속사출성형을 위한 수지 점도 측정 및 수치해석)

  • Jung, T.S.;Kim, J.S.;Ha, S.J.;Cho, M.W.
    • Transactions of Materials Processing
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    • v.23 no.1
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    • pp.41-48
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    • 2014
  • The light guide plate has become the major component for the backlight module in general information technology products (e.g. mobile phones, monitors, etc.). High speed injection molding has been adopted for thin walled LGP giving advantages such as weight, shape, size, and reduction in production costs. In the current study, the rheological characteristics of high liquidity plastic resin PC(HL8000) were measured using a capillary rheometer to improve the reliability of the numerical analysis for high speed injection molding. With the measured viscosity and PVT of PC(HL8000), numerical analysis of injection molding was conducted using the simulation software(Moldflow). Filling time and deflection were predicted and compared with those of traditional PC resins(H3000, H4000). The results show that PC(HL8000) has significantly different rheological characteristics during high speed injection molding. Hence proper properties of the resin should be used to improve the accuracy of numerical predictions.

An Experimental Study of the High-Speed Rotating Fuel Injection System with In-line Injection Orifice (직렬식 분무오리피스를 적용한 회전 연료분사노즐의 분무특성연구)

  • Jang, Seong-Ho;Choi, Seong-Man
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.202-206
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    • 2009
  • We studied the spray characteristics of the high-speed rotating fuel injection system. The diameter of in-line injection orifices are varied from 1mm to 5mm and the number of in-line injection orifices are varied from 3 to 12. Droplet size, velocity and spray distribution were measured by the PDPA(Phase Doppler Particle Analyzer) system and spray was visualized. From the test results, the liquid column generated from the injection orifice is mainly controlled by the rotational speeds. Also diameter of injection orifices and number of injection orifices have influence on the diameters of droplet. Consequently, we find out that the basic mechanism of controlling the droplet size is the liquid film thickness in the injection orifice.

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Effect of Injection Hole and Needle-driven Characteristics on Pilot Spray in High Pressure Injector with Common-rail System (커먼레일 고압분사용 인젝터의 분공수 및 니들구동특성이 Pilot 분무에 미치는 영향)

  • Lee, Jin-Wook;Bae, Jang-Woong;Kim, Ha-Nul;Kang, Kern-Yong;Min, Kyung-Duk
    • Journal of ILASS-Korea
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    • v.9 no.1
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    • pp.8-14
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    • 2004
  • future exhaust emission limits for diesel-driven passenger cars will force the automotive company to significantly develop of the new technologies of diesel engine respectively of the drive assemblies. As we know, the contributions of soot and nitrogen oxide is the main problems in diesel engine. Recently, as a result, the pilot injection of common-rail fuel injection system recognizes an alternative function to solve an environmental problem. This study describes the effect of the nozzle structure and driven characteristic of injector on pilot injection fur a passenger car common-rail system. The pilot spray structure such as spray tip penetration, spray speed and spray angle were obtained by high speed images, which is measured by the Mie scattering method with optical system fur high-speed temporal photography. Also the CFD analysis was carried out for fuel behavior under high pressure in between needle and nozzle of injector for common-rail system to know the condition of initial injection at experiment test. It was found that solenoid-driven injector with 5-hole was faster than 6-hole injector in spray speed at same conditions and piezo-driven injector showed faster response than solenoid injector.

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Flow Analysis of the Plain Seal with Injection (분사를 수반하는 평씨일 내의 유동해석)

  • 이관수;김우승;김기연;김창호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.4
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    • pp.795-802
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    • 1992
  • A numerical analysis is performed on the turbulent flow in the plain seal with injection. The parameters used in this study are as follows : Reynolds number, rotation speed, injection speed, clearance ratio, injection angle, and axial injection location. Flow pattern and leakage performance due to the variation of parameters are investigated. SIMPLER algorithm is used to solve the Navier-Stokes equation governing steady, incompressible turbulent flow and standard K- .epsilon. turbulent model is used to consider the turbulence effects. The leakage performance is significantly enhanced with injection. The increases of the injection flow rate and be rotation speed of the shaft cause the leakage performance to the increased. With the increase of the Reynolds number the leakage performance is diminished. At the injection angle of 90deg, the leakage coefficient has a minimum value. The pressure drop has a maximum value at axial center location but the injection location has little effect on the pressure drop. Clearance ratio has a significant effect on the pressure drop.

Magnetic Helicity Injection in Solar Active Regions Related to the CME Initiation and Speed

  • Park, Sung-Hong
    • The Bulletin of The Korean Astronomical Society
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    • v.35 no.2
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    • pp.50.2-50.2
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    • 2010
  • Magnetic helicity injection in 28 solar active regions producing 46 CMEs was investigated to find its relationship with the occurrence and speed of CMEs. The helicity injection in the active regions under investigation was calculated using full-disk 96 minute MDI magnetograms. The major findings of this study are as follows. First, the 46 CMEs are categorized into two different groups by two characteristic evolution patterns of helicity injection in their active regions: (1) a monotonically increasing of helicity accumulation (Group A; 30 CMEs in 23 active regions) and (2) significant helicity injection followed by its sign reversal (Group B; 16 CMEs in 5 active regions). Second, a fairly good correlation between the helicity injection rate and the CME speed is found for the 30 CME events in Group A. Further statistical studies, however, are needed to check whether the two characteristic helicity patterns are shown in other CME-productive active regions.

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Inertia Force Problem and Nozzle Contact Mechanism on Linear Motor Drive Injection Molding Machine (리니어모터식 사출성형기의 반력문제 및 노즐터치기구)

  • Bang, Yeong-Bong;Yun, Deung-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.10
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    • pp.171-177
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    • 2002
  • This paper presents the inertial force problem of ultrahigh-speed injection molding machine using linear motors, and presents its solutions. To make very thin products by injection molding, very high injection speed is required, and linear motors are used for this purpose. But direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of the inertia force as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic leakage. In this paper, two solutions are proposed for this inertia force problem. One is the mechanical cancellation of the inertia force, and the other to increase the nozzle contact force. With the latter solution, the stationary platen bending worsens, so a new nozzle contact mechanism is also proposed, which can prevent the stationary platen bending.

Inertia Force Problem and Nozzle Contact Mechanism of Linear Motor Drive Injection Molding Machine

  • Bang, Young-Bong;Susumu Ito
    • International Journal of Precision Engineering and Manufacturing
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    • v.4 no.5
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    • pp.34-40
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    • 2003
  • This paper presents the inertial force problem of ultrahigh-speed injection molding machine using linear motors, and presents its solutions. To make very thin products by injection molding, very high injection speed is required, and linear motors are used for this purpose. However, direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of the inertia force which is as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic to leak. In this paper, two solutions are proposed for this inertia force problem. One is the mechanical cancellation of the inertia force, and the other is to increase the nozzle contact force. With the latter solution, the stationary platen bending worsens, so a new nozzle contact mechanism is also proposed, which can prevent the stationary platen bending.

Field-Oriented Speed Control of Induction Machine without Speed Sensor in Overall Speed Range (속도검출기가 없는 유도전동기의 광범위한 속도 영역에서의 자속 기준 속도 제어)

  • Ryu, Hyeong-Min;Ha, Jeong-Ik;Seol, Seung-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.5
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    • pp.338-344
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    • 2000
  • This paper proposes a field-oriented control strategy without speed sensor in overall speed range. At low speed region including zero speed, the electrical saliency which is due to the main flux saturation is used in order to estimate an instantaneous flux position. This electrical saliency can be obtained from the difference of high frequency impedance by the high frequency signal injection. This method enables the stable operation at zero speed or stator frequency even under heavily loaded condition. However, because of the high frequency signal injection the loss and noise in motor increase and the voltage margin is reduced as the motor speed increases. Therefore, this algorithm must be supplemented with the algorithm based on the electrical model of motor, which is conventionally used in the region except the low speed. This paper proposes the combination algorithm between the high frequency signal infection method and the adaptive observer, in which the rotor flux and motor speed can be simultaneously estimated by the adaptive control theory. This combination algorithm enables the stable operation of field-oriented speed control without speed sensor in overall speed range. This is verified by experimental results.

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An Experimental Study on Che Spray Characteristic of Pintle Type Nozzle in a High Temperature and High Pressure Chamber (고온.고압용기 내에서 핀틀노즐의 분무특성에 관한 실험적 연구)

  • 송규근;정재연;정병국;안병규;오은탁
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.1
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    • pp.57-64
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    • 2003
  • The characteristics of fuel spray have an important effect on engine performance such as power, specific fuel consumption and emission because fuel spray controls the mixing and combustion process in an engine. Therefore, if the characteristics of fuel spray can be measured, they can be effectively used for improving engine performance. The major factors controlling fuel spray are injection pressure, ambient pressure and engine speed. In this study, the experiment is performed in a high temperature and high pressure chamber. In experiments, spray tip penetration, spray angle and spray tip velocity are measured at various injection pressure (10 and 14 MPa), ambient pressure(3,4 and 5 MPa), fuel pump speed(500, 700 and 900 rpm). Experimental results are useful for deriving an experimental spray equation and design an optimal engine. The results showed that injection pressure, ambient pressure and fuel pump speed are important factors influencing on the characteristics of spray. 1) Injection pressure influences on the characteristics of spray. That is, as injection pressure is increased, spray angle is decreased but spray penetration and spray tip velocity is increased. 2) Spray angle and spray penetration are increased as fuel pump speed is increased.