• Title, Summary, Keyword: Injection Moulding Analysis

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Determination of Molding Conditions of Double-Shot Injection Mold for the Computer Mouse via Three-Dimensional Injection Molding Analysis (3 차원 사출성형 해석을 통한 컴퓨터 마우스 제작용 이중사출성형 금형의 공정조건 결정)

  • Ahn, Dong-Gyu;Park, Min-Woo;Park, Jeong-Woo;Kim, Hyung-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1619-1625
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    • 2011
  • The objective of this study determine the molding conditions of a double-shot injection mold for fabricating a computer mouse using different materials, by performing three-dimensional injection molding analysis. In order to select the optical injection molding conditions, the effects of the injection time, the maximum injection pressure, the effect of packing time on the injection molding characteristics, and the product qualities were quantitatively examined. From the results of the injection molding analysis, the optimal injection molding conditions of the double-shot injection mold, which leads the molded product to the minimized shrinkage and deflection, were estimated. The results of the injection molding experiments, showed that an appropriate computer mouse can be fabricated using different materials when the identified optimal injection molding conditions are adopted.

A study on the reduction method of sink marks for plastic products with T-shape (T자형 단면형상을 가진 성형품의 싱크마크 불량 감소 방안에 대한 연구)

  • Kim, Da-Eun;Lee, Chun-Kyu
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.12 no.2
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    • pp.22-26
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    • 2018
  • In the automotive industry these days, plastic parts have been developed and replaced with plastic parts by maintaining the same function of existing press parts for a variety of reasons. Injection molding plastic parts are subject to molding defects due to various factors, among which the sink marks usually occur in the areas where bosses and ribs are installed. In this study, we analyzed the influence of various factors on the occurrence of sink marks by using the flow analysis of the forming analysis program(Moldflow analysis) using the rib model with the T-shape. Tests have shown that the greatest influence on the sink mark of cosmetic products is the thickness and pressure of the ribs, and the thickness of the basic moulding thickness of the product increases. However, it was considered that the resin temperature and the mold temperature do not greatly affect the occurrence of the sink mark.

Development of Gear Driving Type Using the Automatic Grease Lubricator (기어구동방식의 자동윤활주유장치 개발)

  • 이규영;왕덕현;김원일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1589-1592
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    • 2003
  • Automatic grease lubricator of gear type was developed by mechanical design, analysis and test with products manufactured by rapid prototyping machine. The mechanism of gear driving was designed in similar to the watch mechanism and lubrication could be controlled by PCB circuit. The body of the lubricator was analyzed by stress analysis with different constructed angle. Digital mockup was analyzed and RP products were combined with PCB circuit and grease. RP products and injection moulding products were tested and compared for roughness and roundness, Finally the grease was drained out for testing the time.

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The Moulding Analysis of Fuel Pressure Regulator to the Vehicle (차량의 연료압력 레귤레이터 성형해석)

  • Park, Chang-Sun;Sung, Back-Sub;Kim, Jae-Yeol
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.2
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    • pp.151-156
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    • 2011
  • This study examined the casting analysis of fuel pressure regulator of LPI vehicles. We aims to predict all the phenomenon accompanied by flow and solidification in die casting, and maximize productivity and quality through optimal casting design. As a result of comparing Types A and B of casting design, it was found that the number of overflow affected flow, flowspeed and solidification temperature. And there was a minute difference between solidification temperatures at thick section of the spare parts. Solidification began at temperatures of $624^{\circ}C{\sim}630^{\circ}C$ but after the casting was completed, temperatures at the center of the parts were $600^{\circ}C{\sim}614^{\circ}C$ Temperature of molten metal showed optimal flow at temperature of $680^{\circ}C$. It began to solidity around at $650^{\circ}C$ and to be cooled between $580^{\circ}C{\sim}550^{\circ}C$ in high speed. When the process was analysed through a computer simulation, it was found that hardness of regulators manufactured through Type B of overflow was above $H_R60$.

Investigation of Development of Bumper Back-Beam Using a Thermoplastic Polyolefin (열가소성 폴리올레핀으로 구성된 범퍼 후방 보 개발에 관한 연구)

  • Ahn, Dong-Gyu;Kim, Se-Hun;Park, Gun-Sung
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.8
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    • pp.896-905
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    • 2012
  • Recently, the application of the plastic material to automotive components and structures has steadily increased to satisfy demands on the saving of overall weight and the improvement of energy efficiency. The objective of this paper is to investigate the development of a bumper back-beam using a thermoplastic olefin (TPO). The bumper back-beam was designed to be manufactured from the injection molding process. In order to obtain a proper design of the bumper back-beam, three-dimensional finite element analyses were performed for various design alternatives. Stress-strain curves for different strain rates were measured by high speed tensile tests of the TPO to consider strain rate effects in the FEA. The influence of the sectional shape and the rib formation on the contact force-intrusion curves, the deflection and the energy absorption rate of the bumper back-beam was examined. From the results of the examination, a proper design of the bumper back-beam was acquired. The bumper back-beam consisting of TPO was fabricated from the injection moulding process and the vibration welding. Pendulum crash tests were carried out using the fabricated bumper back-beam. The results of the tests showed that the designed bumper back-beam can satisfy requirements of the federal motor vehicle safety standard (FMVSS). Through the comparison of the previously designed bumper back-beam with the newly designed bumper back beam, it was noted that the weight of the designed bumper back-beam is lighter than that of the previously designed bumper back beam by nearly 16 %. In addition, it was considered that the newly designed bumper back beam can improve recycling of the bumper back-beam.

Microstructural Morphology and Bending Performance Evaluation of Molded Microcomposites of Thermotropic LCP and PA6 (액정폴리머/폴리아미드6 미시복합재료의 내부구조 및 기계적 굽힘성능 평가)

  • ;Kiyoshi Takahashi
    • Composites Research
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    • v.12 no.6
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    • pp.53-64
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    • 1999
  • Microstructural morphology and bending strengths of moulded composites of thermotropic liquid crystalline polymer(LCP) and polyamide 6 (PA6) have been studied as a function of epoxy fraction. Injection-moulding of a composite plaque at a temperature below the melting point of the LCP fibrils generated a multi-layered structure: the surface skin layer with thickness of $65\;-\;120{\mu\textrm{m}}$ exhibiting a transverse orientation; the sub-skin layer with an orientation in the flow direction; the core layer with arc-curved flow patterns. The plaques containing epoxy 4.8vol% exhibited superior bending strength and large fracture strain. With an increase of epoxy fraction equal to and beyond 4.8vol%, geometry of LCP domains was changed from fibrillar shape to lamella-like one, which caused a shear-mode fracture. An analysis of the bending strength of the composite plaques by using a symmetric layered model beam suggested that addition of epoxy component altered not only the microstructural geometry but also the elastic moduli and strengths of the respective layers.

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