• Title/Summary/Keyword: 금형 가열

Search Result 92, Processing Time 0.033 seconds

Development and Analysis of the Autoclave Alternative Composite Material Molding Process Using a Pressure Device (가압장치를 이용한 오토클레이브 대체 복합재료 성형공정 개발 및 분석)

  • Kim, Jung-Soo;Kim, Byung-Ha;Joe, Chee-Ryong
    • Composites Research
    • /
    • v.27 no.6
    • /
    • pp.254-259
    • /
    • 2014
  • In this study, a device and pressure press process that is able to substitute autoclave process is developed. This process complements disadvantages of autoclave process which are long process-time and high production cost. The developed device provides air pressure as well as the vacuum which are greatest feature of autoclave process. The device is sealed using hydraulic pressure to keep the air pressure inside the mold. The transfer of the heat is designed to be direct. The heating and pressure charging time are decreased by reducing the interior space. Tooling cost is reduced dramatically compared to autoclave process. Spring-back phenomenon is measured and compared. The temperatures of several parts of the mold during molding are measured. The fiber volume fraction of the parts molded by autoclave process and by the developed process are compared.

A Study on the PMMA Lens Fabrication for Surgical Light Based on Injection Molding Convergence Process (사출성형 융합공정 기반 수술실 무영등용 PMMA 렌즈 제작에 관한 연구)

  • Kang, Bo-An;Oh, Hyeong-Jong;Jeong, Byeong-Ho;Jeong, Nam-In
    • Journal of the Korea Convergence Society
    • /
    • v.6 no.1
    • /
    • pp.43-48
    • /
    • 2015
  • We studied on the injection molding conditions of defect-free PMMA lens for surgical light. When the heat temperature of mold is low, more imperfect molding or weldlines and flow marks have showed. A defective lens depends on low fluidity of the PMMA resin and its temperature is high, a flexural strain has occurred. The longer cooling time of specimens, the more cracks have occurred due to resin crystallization. In this study, optimal molding conditions for defect-free PMMA lens is as follows. The heat temperature of core mold was 110 [$^{\circ}C$] and also the cooling time was 25 [sec]. PMMA materials can realized low expense to produce plastic optical lens and applications.

Development and transcription estimation of an automotive interior plastic part(HD Switch Panel) with no glossy etching pattern (무광부식 패턴을 갖는 자동차 내장부품인 HD Switch Panel의 제조 및 전사성 평가)

  • Kim, Young-Kyun;Kim, Dong-Hak
    • Proceedings of the KAIS Fall Conference
    • /
    • 2009.05a
    • /
    • pp.870-873
    • /
    • 2009
  • 본 연구에서는 미세 무광부식 패턴을 갖는 HD Switch Panel 부품을 설계하고 금형을 제작하였다. 이를 위하여 사출성형 Simulation(CAE)을 이용하여 사출성형 공정의 문제점과 부품의 변형량을 예측 하였다. 또한 금형표면의 가열온도와 실제 금형온도의 비교함으로써 공정변수 조절을 통한 사출성형 조건의 최적화를 달성할 수 있었다. 한편, 순간금형표면가열을 이용한 성형기술인 E-MOLD를 적용하여 자동차 내장부품용 HD Switch Panel을 제작하였고, 전자현미경과 원자현미경을 이용한 표면 평가를 통하여 무광부식 패턴의 전사율 향상으로 인한 무광 특성이 향상됨(2.5이상$\rightarrow$1.5~1.7)을 확인하였다.

  • PDF

초고온금형 시스템(E-Mold) 및 응용사례 소개

  • Kim, Gi-Yeong;Kim, Dong-Hak
    • Journal of the KSME
    • /
    • v.51 no.4
    • /
    • pp.45-49
    • /
    • 2011
  • 이 글에서는 플라스틱 사출 성형에 있어 금형 표면온도와 응용 수지의 온도 차이로 필연적으로 발생되는 표면 결함, 미성형 등의 다양한 사출 성형 문제를 해결하기 위해 사출 사이클에 맞추어 금형 표면 온도의 급가열-급냉각을 제어할 수 있는 E-Mold 시스템에 대해 실제 양산 적용사례를 중심으로 소개하고자 한다.

  • PDF

Localized Induction-Heating Method by the Use of Selective Mold Material (재료의 선택적 사용에 의한 금형의 국부적 유도가열기법)

  • Park, Keun;Do, Bum-Suk;Park, Jung-Min;Lee, Sang-Ik
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2009.05a
    • /
    • pp.168-171
    • /
    • 2009
  • High-frequency induction is an efficient way to heat mold surface by electromagnetic induction in a non-contact procedure. Though the induction heating has an advantage in terms of its rapid-heating capacity on the mold surface, it still has a restriction on mold temperature control due to geometric restriction of an induction coil according to the mold shape. It has been recently applied to the injection molding of thin-walled parts or micro/nano structures. For localized induction heating, an injection mold composed of ferromagnetic material and paramagnetic material is used. The electromagnetic induction concentrates on the ferromagnetic material, from which we can selectively heat for the local mold elements. The present study proposed a localized induction heating method by means of selective use of mold material. The feasibility of the proposed heating method is investigated through the comparison of experimental observations according to the mold material.

  • PDF

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
    • /
    • v.37 no.1
    • /
    • pp.35-41
    • /
    • 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.

Development of Vacuum Suction Mold for Automotive on Interior (자동차 내장 부품 진공흡착 금형 개발)

  • Lim, Tae-Yang;Park, Kwang-Jin;Park, Tae-Hyun;Kim, Key-Sun;Kim, Song-Hwa
    • Proceedings of the KAIS Fall Conference
    • /
    • 2010.05b
    • /
    • pp.689-692
    • /
    • 2010
  • 일반형 자동차 내장부품은 외부가 플라스틱 사출 성형한 형태로 사용되지만, 고급 차종은 내장재의 미감이나 질감을 위하여 사출물 표면에 엠보싱 무늬가 형성된 표피재가 수지에 추가로 부착되어 제작된다. 부착하는 방법은 한 장비에서 저압 사출 후 플라스틱이 완전 응고 전에 표피재를 넣고 압입하는 저압 사출법과 표피재 수지를 기 사출된 제품위에 놓고 압착시키는 압착법이 있으나 이 두 방법 모두 엠보싱 무늬가 형성된 표피재를 넣고 작업하기 때문에 고온 압착시 기존 무늬가 찌그러지고 코너 부위가 경화되어 기존의 질감을 얻지 못하며, 치수 공차가 변형되어 불량률이 증가하므로 이를 시급히 개선할 새로운 제조 기술의 필요성이 대두된다. 본 연구는 가열 압착기로 지그 및 금형을 새로 개발하여 도어 트림 제조시, 기 사출물을 금형 쪽으로 기 조직을 삽입한 후 엠보싱 무늬가 없는 원소재 표피재로 상부 금형 쪽으로 소재조직을 진공으로 흡입하여 무늬를 성형한 후 하강시켜, 기 사출물에 압착시키는 가열 압착으로 엠보싱무늬의 손상을 방지하는 금형을 제안하였으며 그에 대한 해석, 설계, 실험을 통하여 성능을 평가 분석 하였다.

  • PDF

Research of High-density Plasma Nitriding Commercializing for Medium & Large Size Mold and Part (중대형 금형, 부품에 대한 고밀도 플라즈마 질화처리 상용화기술 연구)

  • Mun, Jong-Cheol;Jo, Gyu-Yeong;Jeon, Yeong-Ha
    • Proceedings of the Korean Institute of Surface Engineering Conference
    • /
    • 2015.05a
    • /
    • pp.30-30
    • /
    • 2015
  • 가전 전자 제품의 대형화 추세와 함께 사용 금형 역시 정밀대형화가 추진되고 있다. 금형의 대형화로 인해 금형표면에 대한 경화 및 내마모 표면처리에 대한 중요성이 더욱 증대되고 있는 상황인 바, 본 연구에서는 고밀도 이온에 의한 플라즈마 질화처리 기술을 활용하여 금형 사용에 있어 충분한 내구성의 확보와 열 변형 최소화, 후 가공비용의 절감, 기타 금형용 상용화 질화처리 전반에 대한 연구를 진행하였다. 그 결과 금형 소재의 저변형 처리를 위한 적정 에너지 조건, 소형 금형 부품의 고품위 처리를 위한 저비용 공정 기술, 금형 생산 상용화 효율 향상을 위한 가열 및 냉각 공정 개선 성과를 확보할 수 있었다.

  • PDF

Local Heating of an Injection Mold using Selective Induction Heating (선택적 유도가열을 사용한 사출금형의 국부가열기술)

  • Do, Bum-Suk;Park, Jung-Min;Eom, Hye-Ju;Park, Keun
    • Proceedings of the KSME Conference
    • /
    • 2008.11a
    • /
    • pp.1119-1123
    • /
    • 2008
  • High-frequency induction is an efficient way to heat mold surface by electromagnetic induction in a noncontact procedure. It has been recently applied to the injection molding of thin-walled parts or micro/nano structures. Though the induction heating has an advantage in terms of its rapid-heating capacity on the mold surface, it still has difficulty in efficient mold temperature control due to the restriction of an induction coil design suitable for the given mold shape. The present study proposed a localized mold heating method by means of selective use of mold material. For localized induction heating, an injection mold composed of ferromagnetic material and paramagnetic material is used. The electromagnetic induction concentrates on the ferromagnetic material, from which we can selectively heat for the local mold elements. The feasibility of the proposed heating method is investigated through an experimental measurement in terms of the heating efficiency on the localized mold surface.

  • PDF

Development of simulation method for heating line optimization of E-Mold by using commercial CAE softwares (전산모사 프로그램을 이용한 E-MOLD의 Heating Line 배치의 최적화 설계에 관한 연구)

  • Chung, Jae-Youp;Kim, Dong-Hak
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.9 no.6
    • /
    • pp.1754-1759
    • /
    • 2008
  • To produce plastic parts that have fine pattern through conventional injection molding, a lot of difficulties follow. Therefore, rapid heating and cooling methods are good candidates for manufacturing injection-molded parts with micro/nano patterns. In this study, we adopted the E-Mold patent technology. The mold for E-Mold technology has a separate heated core with micro heaters. It is very important to optimize the lay-out of the heaters in heated core because it influences both control and distribution of mold temperature. We developed a optimization method of heating line lay-out by using commercial softwares and compared the output with the experimental results. We used Pro-Engineer Wildfire 2.0 for the mold design, ICEMCFD for mesh generation, and FLUENT for heat transfer simulation. The simulation results showed the temperature profile from $60^{\circ}C$ to $120^{\circ}C$ or $180^{\circ}C$ during heating and cooling process which were compared with the injection molding experiments. We concluded that the simulation could well explain the experimental results. It was shown that the E-Mold optimization design for heater lay-out could be available through the simulation.