• Title/Summary/Keyword: Micro-Molding

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A basic study on insert deformation characteristics of thin foil insert injection molding process (박판 Insert 사출성형시 Insert 변형 특성에 관한 기초 연구)

  • Jung, Woo-Chul;Shin, Gwang-Ho;Heo, Young-Moo;Yoon, Gil-Sang;Lee, Jeong-Won
    • Design & Manufacturing
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    • v.2 no.5
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    • pp.5-10
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    • 2008
  • Recently, ultra precision and light-weight micro products are needed in various industries. Injection molding products with metal insert material is often satisfied with light-weight and precision simultaneously. The researches on macro-size insert deformation have been performed but, a research on micro-size insert is meager. In this paper, the injection molding product with $300{\mu}m$ thin foil insert is designed and insert injection molding process is performed. Finally, the deformation of thin foil insert is analyzed according to insert feature and gate length.

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[ μ ]-Injection Molding Process Analysis for In-Plane Microneedle (In-Plane형 마이크로니들의 미세사출공정해석)

  • Kang J. J.;Heo Y. M.;Jung T. S.;Lee S. H.
    • Transactions of Materials Processing
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    • v.14 no.6 s.78
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    • pp.491-495
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    • 2005
  • Micro injection molding analysis for microneedle fabrication was performed in the present study. The dimensions of width and thickness for in-plane microneedle are $600{\mu}m$, $500{\mu}m$, respectively. A delivery system based on guidelines for traditional injection molding was designed for four-cavities molding system. To investigate the effects of processing conditions in the mirconeedle fabrication, injection molding analysis using commercial code was performed. It was shown that the total injection time has a significant effect on the fabrication of in-plane microneedles.

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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    • 2002.10a
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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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Formation of barrier ribs for PDP by injection molding method

  • Choi, Hak-Nyun;Kim, Yong-Seog
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.388-390
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    • 2003
  • Paste micro-injection molding process was applied for fabrication of barrier ribs of PDP in an attempt to reduce processing steps and materials loss during the processing. For the paste, a thermally curable one was used and for the mold, a polymeric soft mold was used. It was demonstrated that the micro-molding process can be used successfully in producing barrier ribs of PDP.

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A study on the micro pattern replication properties of large area in injection molding (대면적 미세패턴 사출성형에서의 전사 특성 실험)

  • Kim, T.H.;Yoo, Y.E.;Je, T.J.;Kim, C.W.;Park, Y.W.;Choi, D.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.205-208
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    • 2007
  • We injection molded a thin plate with micro prism patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, injection rate or packing pressure. The size of the $90^{\circ}$ prism pattern is $50{\mu}m$ and the size of the plate is $400mm{\times}400mm$. The thickness is 1mm. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns of the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

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A study on the prizm pattern replication in injection molding (사출 도광판의 프리즘 패턴 전사성에 관한 실험적 연구)

  • Kim, Chang-Wan;Yoo, Yeong-Eun;Kim, Tae-Hoon;Je, Tae-Jin;Choi, Doo-Sun
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1537-1541
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    • 2007
  • We injection molded a wedge type of plate with micro prizm patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, melt temperature, injection rate or packing pressure. The size of the size of the $90^{\circ}$ prizm pattern is $50{\mu}m$ and the size of the plate is about 300㎜${\times}$200㎜. The thicknesses are 2.6㎜. and 0.7mm at each edge of the wedge type of plate. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns on the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

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Improvement of surface quality of Tungsten-carbide core for glass micro molding (미세 유리 광부품 성형용 초경합금 코어의 표면거칠기 향상에 관한 연구)

  • Lee J.;Kim W.;Min B.;Kang S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.36-39
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    • 2004
  • Glass molding is an advantageous method to manufacture glass micro optical components. However, it is difficult to make Tungsten Carbide core for glass microlens array. We have developed novel method to fabricate Tungsten Carbide core for micro glass components using pressure forming. Silicon masters were fabricated by micro machining. Tungsten Carbide core was fabricated by pressure forming and sintering. And we made high quality surface of Tungsten Carbide core by using the magnetic-field-assisted polishing process.

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Finite Element Analysis for Shape Prediction on Micro Lens Forming (마이크로 렌즈 성형시 형상예측을 위한 유한요소해석)

  • 전병희;홍석관;표창률
    • Transactions of Materials Processing
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    • v.11 no.7
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    • pp.581-588
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    • 2002
  • Among the processes to produce micro lens, the process using press molding is a new technology to simplify the process, but it contains many unknown variables. The press-molding process proposed in this paper was simplified into two step process, the first step is the pressing to design the preform for glass element, the second step is the annealing to reduce the residual stress. It is important to estimate the amount of shrinkage of glass gob and the residual stress during process. It Is difficult to evaluate the process variables as mentioned above through the experiment. The influences due to process variables was evaluated by using FEM parametric analysis. The results in this paper can be applicable to produce micro lens.

Active Infrared Thermography for Visualizing Subsurface Micro Voids in an Epoxy Molding Compound

  • Yang, Jinyeol;Hwang, Soonkyu;Choi, Jaemook;Sohn, Hoon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.37 no.2
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    • pp.106-114
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    • 2017
  • This paper presents an automated subsurface micro void detection technique based on pulsed infrared thermography for inspecting epoxy molding compounds (EMC) used in electronic device packaging. Subsurface micro voids are first detected and visualized by extracting a lock-in amplitude image from raw thermal images. Binary imaging follows to achieve better visualization of subsurface micro voids. A median filter is then applied for removing sparse noise components. The performance of the proposed technique is tested using 36 EMC samples, which have subsurface (below $150{\mu}m{\sim}300{\mu}m$ from the inspection surface) micro voids ($150{\mu}m{\sim}300{\mu}m$ in diameter). The experimental results show that the subsurface micro voids can be successfully detected without causing any damage to the EMC samples, making it suitable for automated online inspection.