• Title, Summary, Keyword: 사출성형 해석

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Study on Improvement of Dimensional Accuracy of a Precision Plastic Screw Under Various Injection-Molding Conditions (사출성형 조건에 따른 정밀 플라스틱 나사의 형상정밀도 향상에 관한 연구)

  • Baek, Soon-Bo;Park, Keun;Youm, Chung-Ho;Ra, Seung-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.10
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    • pp.1549-1554
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    • 2010
  • Recently, plastic screws have replaced metal screws because of the former's light weight, thermal and electrical insulating properties, and anticorrosion characteristics. Plastic screws are usually produced by injection molding, which involves material shrinkage during the solidification of the polymer. This shrinkage results in the degeneration of the dimensional accuracy. In the present study, the effect of injection-molding conditions on the dimensional accuracy of plastic screws was investigated through a numerical simulation of injection molding; on the basis of this simulation, we could determine the mold-design parameters. The design of experiment was applied in accordance with the numerical analysis in order to optimize the injection-molding conditions with a view to improving the dimensional accuracy of the precision plastic screw.

Research on Gas Injection Mold using CAE Analysis of Steering wheel Parts (자동차핸들 제품의 CAE해석을 활용한 가스 사출성형에 관한연구)

  • Kang, Sae-Ho;Woo, Chang-Ki;Kim, Ok-Rae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.11
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    • pp.7729-7735
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    • 2015
  • As plastic injection mold parts is suitable system mass production making mold. So thick steering wheel parts is desirable to carry out gas injection molding. Gas injection mold is skill to inject nitrogen gas postfilling melting raw material into mold. Gas injection mold have many advantage like retrenchment of material cost, upgrading the guality. etc. It was decided gate position to minimize warpage of parts analysis injection mold process using mold flow software and incase doing gas injection mold using normal p.p material. it occur big warpage. so it is object minimizing warpage of injection parts to change p.p material containing mineral 18% and removing fingering phenomenon trouble as changing gate position. Also in case carrying out gas injection mold, I did comparison and analysis to grasp shape flow in gas setting a standard gate after flowing in raw material. Through this study, I found out changing of thickness by parts shape and it can occur warpage of parts by plastic material even though it carry out gas injection mold and it had a direct influence on trouble of parts by gate position.

CAE Analysis for Cooling Deformation on the radius curvature of Multi-layer Jar Vessel (다층두께 Jar용기의 곡률반경에 따른 냉각변형 CAE 해석)

  • Shin, Nam-Ho;Choi, Jong-Suk
    • Proceedings of the KAIS Fall Conference
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    • pp.261-264
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    • 2006
  • 본 논문에서는 다양한 곡률반경의 연속에 의하여 살 두께 차가 큰 사출성형품에 불균일한 수축으로 인한 변형이 생성되어 이를 방지하기 위한 적정 CAE 냉각설계를 수행하였다. SAN 및 PMMA 재질의 Jar용기에 대한 균일냉각구조와 최적성형조건을 금형설계에 적용하고자 사출성형의 중요인자인 사출압력, 수지온도, 금형온도, 냉각조건 등을 moldflow 프로그램을 활용하여 연구를 수행하였다. 연구결과로서, 적정 변수인 사출압력 상승, 수지온도 낮춤, 급속냉각으로 후로우 등의 불량현상을 분석하였고 변형 및 불량을 극소화시킬 수 있는 냉각구조와 사이클 시간을 단축시킬 수 있는 사출성형조건을 제시하였고 적정 냉각모듈로부터 냉각시간을 단축하였다.

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Improvement of Moldability for Ultra Thin-Wall Molding with Micro-Patterns (마이크로 패턴을 가진 초박육 사출성형의 성형성 개선)

  • 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.556-561
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    • 2007
  • The rapid thermal response(RTR) molding is a novel process developed to raise the temperature of mold surface rapidly in the injection stage and then cool rapidly to the ejection temperature by air or water. The objectives of this paper are to investigate the effect of mold temperature, pressure and thickness of micro pattern molding and to provide a optimization of RTR injection molding for micro pattern from Moldflow simulation. Optimal minimum temperature and pressure was found without shortcut according to thickness. Filling percentage was influenced by glass transition temperature with the kinds of resin. Optimal temperature is slightly higher than glass transition temperature irrespectively of pressure, thickness, the kinds of resin in the micro pattern molding.

Development of Injection Mold for Automotive Air Vent (승용차 내장용 에어 밴트 부품 사출 금형 개발에 관한 연구)

  • Park, Kwang-Jin;Lim, Tae-Yang;Park, Tae-Hyun;Kim, Key-Sun;Kim, Song-Hwa
    • Proceedings of the KAIS Fall Conference
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    • pp.974-977
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    • 2010
  • 본 논문은 자동차의 부품 중 에어 밴트를 효율적으로 개발하기 위하여 제품의 형상, 사출 해석, 변형과 그 제품이 완성차에 설치 시 열유동에 관한 해석 및 개발에 관한 논문이다. 이를 위하여 3차원 설계를 한 후, 사출성형 공정에 대한 충전시간, 웰드 라인, 에어트랩 등 사출 성형 공정에 대한 분석 하였다. 다음으로 완성차에 조립된 상태에서 열유동 해석을 통하여 제품 윤곽선의 적합성을 확립하였으며 이를 바탕으로 하여 금형을 제작할 수 있는 설계조건을 확립 하였다.

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Shrinkage in Injection Molded Part for Operational Conditions and Resins (성형조건과 수지의 종류에 따른 사출 성형품의 성형 수축)

  • Mo, Jung-Hyuk;Chung, Wan-Jin;Lyu, Min-Young
    • Elastomers and Composites
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    • v.38 no.4
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    • pp.295-302
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    • 2003
  • The amount of shrinkage of injection molded parts is different from operational conditions of injection molding such as injection temperature, injection pressure and mold temperature, and mold design such as gate size. It also varies depending on the presence of crystalline structure in resins. In this study, part shrinkage was investigated for various operational conditions and resins. Poly(butylene terephthalate) (PBT) for crystalline polymer, and polycarbonate (PC) and poly(methyl methacrylate) (PMMA) for amorphous polymers were used. Crystall me polymer showed higher part shrinkage by about three times than that of amorphous polymers. Part shrinkage increased as melt and molt temperatures increased, and injection pressure decreased. Part shrinkage decreased as gate size increased since the pressure delivery is mush easier for larger gate sizes. Part shrinkage at the position close to the gate was larger than that or the position far from gate. This phenomenon might be occur by difference of residual stress.

A Study on the Battery Case Injection Molding by CAE Analysis (CAE 해석을 이용한 배터리 케이스 사출성형에 관한 연구)

  • Lee, Young-Uk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.1
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    • pp.55-61
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    • 2011
  • Battery cases have been made of polypropylene and its warpage is relatively large due to the crystalline characteristic of polypropylene. In this study, the battery case when the injection mold used to improve the Gate by simplifying the process of production cost savings and focus on improving the quality of molding CAE analysis was carried out. The result could be produced in plastic and products of the imbalance in the flow and deformation and to predict reliability of the product will contribute to reduced scrap.

LIGA-reflow Micro-lens Pattern 적용 도광판의 미세사출성형

  • 황철진;허영무;하수용;이규현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.134-134
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    • 2004
  • LCD-BLU의 고효율 광특성을 유도하기 위한 도광판의 초미세패턴 형상가공기술, 미세사출성형기술과 미세형상패턴 광학해석기술 및 전광특성 측정 및 보완기술이 요구된다. 이러한 기술들을 바탕으로 LCD-BLU의 고단가의 주요요인인 기능성 광학 sheet(prism sheet 등)를 연차적으로 제거 및 도광판에 기능을 결합하는 기술개발이 본 연구의 목적이다.(중략)

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Linear Structural Analysis of Standard Plastic Tensile Specimen with Residual Stress Induced by Injection Molding (사출성형과정의 잔류응력을 고려한 표준인장시편의 선형구조해석)

  • Lee D.M.;Han B.K.;Lee Sung-Hee
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.579-580
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    • 2006
  • In this study, an injection mold of tensile test specimen was manufactured by international standard. Pressure and temperature in the cavity of the injection mold was measured by sensors. Simulation of injection molding process was performed with the same condition of experiment and linear structural tensile analysis was also performed with the initial condition of the residual stress induced by injection molding analysis. Normalized elastic coefficient of tensile test was compared with that of structural analysis. It was shown that the residual stress induced by injection molding has an effect on both the experiment of tensile test and linear structural analysis.

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Flow Simulation and Deformation Analysis for Injection Molded Plastic Lenses using Solid Elements (입체요소를 사용한 플라스틱 렌즈의 사출성형 및 후변형 해석)

  • Park, Geun;Han, Chul-Yup
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.784-787
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    • 2003
  • The present work covers three-dimensional flow simulation and deformation analysis of injection molded plastic lenses using solid elements. A numerical scheme to evaluate part deformation has been proposed from the results of injection molding analysis. Proposed scheme has been applied to the injection molding processes of optical plastic lenses: a spherical lens and an aspheric lens for a photo pick-up device. Through the simulation processes. residual stress is estimated and the final deformed patters are obtained for both products. The reliability of the proposed approach has also been verified in comparison with the results of real experiments.

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