• Title, Summary, Keyword: Micro mold

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A Study on the Machining Characteristics for Micro Lens Array Mold (마이크로 렌즈 어레이 금형의 가공특성에 관한 연구)

  • 정재엽;이동주;홍성민;제태진;이응숙
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.370-375
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    • 2002
  • Recently, the interest on micro optical parts has increased rapidly with the development of technology related to microsystems. Among the optical parts, micro lens is one of the most broadly used micro parts. To mass-produce the micro lenses, it is very effective to use the mold insert and injection molding process. There are many methods to fabricate the mold insert for micro lenses: electroforming, etching, mechanical micromachining and so on. In this study, we fabricated the mold insert for micro lenses using a micro ball endmill to apply mechanical micromaching method and analyzed the effect of main process parameters such as spindle speed, feed rate, dwell time on the processed surface. Then, using fabricated the mold insert we fabricated the micro lenses through injection molding process.

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Development of µ-PIM standard mold with exchangable insert core in order to manufacture micro pattern (마이크로 패턴 성형을 위한 인서트 코어 적용 µ-PIM 표준금형 개발에 관한 연구)

  • Park, Chi Yoel;Seo, Chan-Yoel;Kim, Yongdae
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.11 no.3
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    • pp.29-34
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    • 2017
  • Increased demand for parts with micro-pattern structure made of metals, ceramics, and composites in various fields such as medical ultrasonic sensors, CT collimators, and ultra-small actuator parts. Micro powder injection molding (PIM) is a technology for manufacturing micro size, high volume, complex, precision, net-shape components from either metal or ceramic powder. In the present study, a standard mold with a variable insert core capable of producing various micro patterns was investigated. An injection molding test was performed on a standard mold using a line type micro-pattern core having an aspect ratio of 2, a slenderness ratio of 70, a pattern size of $200{\mu}m$, and a pattern spacing of $150{\mu}m$. During the filling process, the deformation of the mold with large aspect ratio and slenderness ratio was analyzed by the experiment and the numerical simulation according to the position of the gate. We proposed a mold structure that minimizes mold deformation by gate modification and enables uniform pattern filling behavior.

Manufacturing technology of micro parts by powder injection molding (PIM기술을 이용한 마이크로 부품 성형기술)

  • Lee, W.S.;Ko, S.H.;Jang, J.M.;Kim, I.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.60-63
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    • 2009
  • Manufacturing technologies of micro spur gear and micro mold by micro PIM were studied with stainless steel feedstock. For molding of gears, micro mold with gear cavity of 1.2 mm in diameter was produced by wire EDM. The proper injection pressure was selected to 70bar by observation and measuring of shapes and shrinkage of gears before/after sintering. For fabrication of micro mold, a tiny polymer gear was produced by injection into the mold. Then, 316L feedstock was again injected/compressed on the polymer gear and debinded together with polymer gear followed by sintering. As a result, another metal mold with gear cavity reduced to about 20% was fabricated and through repetition of this process chain, micro gear mold with cavity about below 800 um was finally obtained. In reduction of size by injection/compression molding, height of gear tooth was shrunk more and the effort for decrease of roughness of micro cavity were carried out ultrasonic polishing and as a result, the roughness in cavity decreased from 3-4 um to about 200 nm.

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Micro-molding of microlens array using electroformed mold insert

  • LEE NAMSUK;MOON SU-DONG;KANG SHINILL
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.15-19
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    • 2003
  • Polymeric micro lens arrays with diameters of $13\~96\;{\mu}m$ fabricated using the micro-compression molding with electro formed mold inserts. In the present study, the electro forming process was used to make the metallic micro-mold insert for micro-molding of microlens array. The wettability property of the fabricated mold insert was examined by measuring the contact angle of the polymer melt on the mold insert. Microlenses were compression-molded with the fabricated mold insert. The effects of the molding temperature and wettability property on the replication quality of the molded lenses were analyzed experimentally.

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Influence upon Machining Accuracy of Micro-Pattern Roll Mold Processed by Temperature Variation (미세 패턴 롤 금형 가공시스템의 온도변화가 가공정밀도에 미치는 영향 연구)

  • Je, T.J.;Park, S.C.;Lee, K.W.;Noh, J.S.;Choi, D.S.;Whang, K.H.
    • Transactions of Materials Processing
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    • v.18 no.2
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    • pp.107-111
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    • 2009
  • Temperature variation happens in micro prism roll mold processing system during machining the prism pattern roll mold using manufacturing optical films of LCD (liquid crystal display). This temperature variation induces pitch errors of the prism patterns. The temperature variation displaces the positions of the diamond cutting tool on the roll which was coated by the copper. In order to prevent the pitch errors, the stabilizing the temperature of machining environment is needed. Therefore, the researching on the temperature variation of the ultra-precision roll mold processing system on the machining of micro prism rot 1 mold is needed. In this paper, the temperature variation of micro prism roll mold processing system is researched, the influence is analyzed, and the study for reducing the pitch errors carried out.

Development of micro-mold for New Injecton Molder to fabricate Micro-Nano system (Micro-Nano 시스템 제조를 위한 소형 차세대 사출기 개발과 이를 위한 Micro meld의 개발)

  • 황교일;류경주;김훈모
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.910-913
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    • 2002
  • Recently, the sensor and actuator are developed with EAP(Electro Active Polymer). Common used of they is close at hand, the bio chip and Lab on a chip are researched. For developed bio and micro system, a researcher applies semiconductor fabrication or make it by his hand. But, this method takes long time and a tolerance is large So they are problem of common used. So In this paper we propose the new inject ion molder and micro mold. The micro mold is different from exist ing mold. In this paper, the fabration of micro mold is introduced to inject.

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A Basic Study of replication and brightness for micro injection molding with ${\sim}50{\mu}m$ micro-lens pattern mold ($50{\mu}m$ Microlens 패턴 금형의 미세사출성형 전사성과 전광특성 기초연구)

  • Hwang C. J.;Ko Y. B.;Heo Y. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.280-283
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    • 2004
  • Micro-lens patterned micro-mold fabrication method for Light Guiding Plate(LGP), kernel part of LCD-BLU(Back Light Unit), was presented. Instead of erosion dot pattern for LGP optical design, micro-lens pattern, fabricated by LIGA-reflow process, was applied. Optical pattern design method was also developed not only for negative pattern LGP, but also positive pattern LGP. During injection molding process, experimental study was conducted to improve replication quality and brightness of ${\sim}50um$ micro-lens pattern mold. The effect of mold temperature for the replication quality of micro-lens array was studied.

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Nano-mold fabrication for imprinting lithography (나도 Imprinting 을 위한 몰드 제작에 관한 연구)

  • Lee, Jin-Hyung;Lim, Hyun-Uoo;Kim, Tae-Gon;Lee, Seung-Seoup;Park, Jin-Goo;Lee, Eun-Kyu;Kim, Yang-Sun;Han, Chang-Su
    • Proceedings of the KSME Conference
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    • pp.1073-1077
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    • 2003
  • This study aims to investigate the fabrication process of nano silicon mold using electron beam lithography (EBL) to generate the nanometer level patterns by nano-imprinting technology. the nano-patterned mold including 100mm pattern size has been fabricated by EBL with different doses ranged from 22 to 38 ${\mu}C/cm^2$ on silicon using the conventional polymethylmetharcylate(PMMA) resist. The silicon mold is fabricated with various patterns such as circles, rectangles, crosses, oblique lines and mixed forms, The effect of dosage on pattern density in EBL is discussed based on SEM (Scannning Electron Microscopy) analysis of fabricated molds. The mold surface is modified by hydrophobic fluorocarbon (FC) thin films to avoid the stiction during nano-imprinting process.

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A Study about Micro Mold for Polymer Injection (고분자소재 성형용 마이크로 금형에 관한 연구)

  • Heo Y. M.;Shin K. H.;Yoon G. S.;Jung W. C.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.271-275
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    • 2004
  • In recent industry, according to pursuit the miniaturization and high-precision of machine part with development of new technology as IT and BT, the development of mold manufacturing technology for mass production is accompanied. This study proposes the design of micro mold-base, predicts the error of product through estimating transformation of injection process using FEM. Therefore the mold-base which is suitable for micro injection proposed in this study. Finally, the error of feature is analyzed by measuring the manufactured micro mold-base.

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