• Title/Summary/Keyword: Micro wire

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Modeling Microstructural Changes in Steel Wire Drawing (펄라이트 강 선재 인발에서 미세조직 변화 모델링)

  • Yoon, S.H.;Lee, Y.S.;Nam, W.J.;Park, K.T.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.271-272
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    • 2008
  • This paper is concerned with the prediction of micro structural changes of pearlitic steel wire during clod drawing. The most important microstructural aspects are ferrite/cementite interlamellar spacing, cementite shape and thickness, since those are crucial factors to determine the mechanical strength of pearlitic steel. In this study, a couple of new algorithms to predict the above microstructural changes are developed based on the deformation histories of macro material points obtained from finite element simulations for pearlitic steel wire drawing. Some predictions are shown. The special features of the algorithms developed in this study are discussed in details.

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Tool Electrode Wear Compensation using Round Trip Method for Machining Cavities in Micro EDM Process (마이크로 방전가공에서 Round Trip Method를 이용한 전극마모 보정)

  • Park Sung-Jun;Kim Young-Tae;Min Byung-Kwon;Lee Sang-Jo
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.10
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    • pp.42-49
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    • 2004
  • Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal process. The recent trend in reducing the size of product has given micro EDM a significant amount of research attention. Micro EDM is capable of machining not only micro holes and micro shafts as small as a few micrometers in diameter but also complex three dimensional micro cavities. But, longitudinal tool wear by electrical discharge is indispensable and this affects the machining accuracy in micro EDM process. Therefore, newly developed tool wear compensation strategy called round trip method is suggested and verified by experiment. In this method, machining depth of cut, overlap effect and critical travel length are also considered.

3D Measurement System of Wire for Automatic Pull Test of Wire Bonding (Wire bonding 자동 전단력 검사를 위한 wire의 3차원 위치 측정 시스템 개발)

  • Ko, Kuk Won;Kim, Dong Hyun;Lee, Jiyeon;Lee, Sangjoon
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.12
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    • pp.1130-1135
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    • 2015
  • The bond pull test is the most widely used technique for the evaluation and control of wire bond quality. The wire being tested is pulled upward until the wire or bond to the die or substrate breaks. The inspector test strength of wire by manually and it takes around 3 minutes to perform the test. In this paper, we develop a 3D vision system to measure 3D position of wire. It gives 3D position data of wire to move a hook into wires. The 3D measurement method to use here is a confocal imaging system. The conventional confocal imaging system is a spot scanning method which has a high resolution and good illumination efficiency. However, a conventional confocal systems has a disadvantage to perform XY axis scanning in order to achieve 3D data in given FOV (Field of View) through spot scanning. We propose a method to improve a parallel mode confocal system using a micro-lens and pin-hole array to remove XY scan. 2D imaging system can detect 2D location of wire and it can reduce time to measure 3D position of wire. In the experimental results, the proposed system can measure 3D position of wire with reasonable accuracy.

Fabrication of Micro Tool Electrode for Machining Micro Structures using Wire Electrical Discharge Grinding(WEDG) (WEDG 방법을 이용한 마이크로 구조물 가공용 미세공구 제작)

  • Park Sung-Jun;Ahn Hyun-Min;Lee Kyo-Seung
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.5
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    • pp.13-20
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    • 2005
  • Micro EDM process is generally used for machining microholes, cavities, and three dimensional shapes. For machining micro structures, first of all, micro tool electrode is indispensable and WEDG system is proposed for tool fabrication method. When using WEDG, its machining characteristics are highly affected by many EDM parameters such as applied voltage, current, rotation speed, capacitance, and pulse duration. Therefore, the design of experiment is introduced to fully understand the effect of the EDM parameters on machining tool electrode. And an attempt has been made to develop the mathematical model for predicting the size of the tool electrode by calculating spark distance. The suggested model was verified with experiment and predicted working gap distance is in good accord with the measured value.

A Study on Laser Micro Joining of Small Diameter Gold Wires to Nickel Thin Films (미소 직경 골드 와이어와 니켈 박막의 레이저 마이크로 접합에 관한 연구)

  • Park, K.W.;Na, S.J.
    • Laser Solutions
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    • v.10 no.2
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    • pp.25-28
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    • 2007
  • Rapidity and flexibility are very important in the electronic components industry. The laser process provides the industry with more rapidity and flexibility. For this reason, the laser process is considered as an acceptable method in terms of rapidity and flexibility. In this study, a wide range of experiments have been carried out on the gold wire-to-nickel thin film joining using the continuous wave fiber laser. In particular, changes in the shape of joint depending on the changes of a target point have been observed.

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The effect of heat treatment on torsion characteristics of core for transmission conductors (송전선 강심의 비틀림 특성에 미치는 열처리의 영향)

  • Kim, Jung-Hoon;Kim, Bong-Seo;Kim, Shang-Shu;Hyun, Seok-Kyu;Kim, Byung-Geol;Lee, Hee-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07a
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    • pp.526-528
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    • 2003
  • The effect of heat treatment on torsion characteristics of high nitrogen steel wire has been studied by using torsion test, micro vickers hardness and scanning electron microscopy. After heat treatment at $600{\sim}700^{\circ}C$, the torsion cycle was increased with increasing temperature. Especially, in case of high nitrogen steel wire heat treated at $600^{\circ}C$, the torsion cycle was sharply increased. It is estimated that the cold-worked high nitrogen steel wire started to recrystallize around at $650^{\circ}C$ in air atmosphere.

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Microstructure and mechanical properties of Nd:YAG Laser welded AZ31-H24 Magnesium alloy using AZ61 filler metal (AZ61 filler wire를 사용하여 Nd:YAG Laser 용접한 AZ31-H24합금의 미세조직과 기계적 특성)

  • Ryu, Chung-Seon;Lee, Mok-Yeong;Bang, Guk-Su;Jang, Ung-Seong
    • Proceedings of the KWS Conference
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    • 2007.11a
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    • pp.322-324
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    • 2007
  • Nd:YAG laser welding of AZ31B-H24 magnesium alloy was carried out using AZ61 filler wire(Mg-6wt%Al-1wt%Zn). Microstructure and mechanical properties of welded joint were examined by optical microscopy, scanning electronic microscopy(SEM), energy dispersive spectroscopy(EDS), electron probe micro analyzer(EPMA) and victors hardness, tensile test at the room and elevated temperature. Test results indicate that the specimens welded with AZ61 filler wire have better tensile strength, elongation and victors hardness at room temperature than those of welded without filler wire. However tensile strength are similar but elongation are quite different at elevated temperature.

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Growth of Rubrene Crystalline Wire via Solvent-vapor Annealing

  • Park, Ji-Hoon;Choi, Jeong-M.;Lee, Kwang-H.;Mun, Sung-Jin;Ko, G.;Im, Seong-Il
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.871-873
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    • 2009
  • We report on the growth of rubrene ($C_{42}H_{28}$) wire fabricated by thermal evaporation, followed by solvent-vapor annealing for the application of organic thin film transistor. Solvent-vapor annealing was carried out in precisely controlled vapor pressure at elevated temperature. Micro-sized, and elongated rubrene wire was obtained via solvent annealing process reproducibly. Optical image and XRD data shows highly crystalline quality of rubrene wire.

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Experimental study on the surface integrity of electrode for WEDG process (WEDG 전극가공에서의 전극표면형상의 실험적 고찰)

  • 안현민;김영태;박성준;이송규;이상조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.218-222
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    • 2002
  • Micro-EDM is generally used far machining micro holes, pockets, and 3-D structures. For micro-EDM, first of all, micro-electrode fabrication is needed and WEDC system is proposed for tool electrode fabrication method. When tool electrode is fabricated using WEDG system, its characteristics are under the control of many EDM parameters. Also relations between the parameters affect electrode fabrication. In this study, experiments are carried out to analyze effects of EDM parameters about electrode surface integrity on micro-electrode fabrication. Experimental method and analysis are used to experimental design method. Factors used in experiments are composed of capacitance, resistance, pause time, wire feed rate, spindle rotating speed. As a result of experiments, capacitance and resistance affect electrode surface.

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