• 제목/요약/키워드: Electro-chemical Machining

검색결과 25건 처리시간 0.029초

펄스 전압을 이용한 인바 합금의 미세 전해가공 (A study of Pulse EMM for Invar alloy)

  • 김원묵;백승엽;이은상;탁용석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.560-563
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    • 2004
  • Invar is a compound metal of Fe-Ni system and contain 36% Ni. The most distinction characteristic of Invar is the coefficient of thermal expansion is 1.0 10$^{-6}$ /$^{\circ}C$. That is a tenth of general steel material. This low thermal expansion characteristic of Invar is applied to the missile, aircraft, monitor CRT and frontier display's shadow mask such as FED and OLED. The usage of the Invar shadow mask for display is increasing due to the requirement of larger size and flatness monitor. The Invar shadow mask is machined by two ways electro-forming and laser now. However the electro-forming takes a too long time and the laser machining is accompanied with Burr. In this study, PEMM(pulse electrochemical micro machining) is conducted to machine the micro hole to the Invar and 80${\mu}{\textrm}{m}$ hole was machined.

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전기전도성 이방성 복합재료 방전가공의 수치 해석 (Numerical Analysis of the Electro-discharge Machining Process of a Conductive Anisotropic Composite)

  • 안영철;천갑제
    • Korean Chemical Engineering Research
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    • 제47권1호
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    • pp.72-78
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    • 2009
  • 전기전도성 이방성 복합재료의 방전가공에 대하여 비정상상태 수식모델을 세우고 갤러킨의 유한요소법으로 해를 구하였다. 피삭재의 온도 분포와 분화구의 모양 및 공작물 제거 속도를 공정 매개변수에 관하여 구득하였다. 계산의 정확도와 효율을 위하여 앞선 연구에서 최적치로 선정된 $12{\times}12$ 요소의 비규칙 체눈을 사용하였다. 알루미나/티타늄 카바이드 복합재료의 물성을 재료의 물성으로 선정하였고 51.4 V의 전압과 7 A의 전류를 갖는 전력을 적용하였으며 제거 효율을 10%로 전열 이방성 계수를 2와 3으로 가정하였다. 불꽃이 일어나면서 피삭재는 즉시 녹기 시작하였고 열적 손상 영역이 형성되었다. 또한 시간이 흘러감에 따라서 분화구의 경계가 이동하는 것이 확인되었다. 반경 방향과 축 방향의 열전도도가 독립적으로 커지면 온도분포와 분화구의 모양이 각각 반경 방향과 축 방향으로 이동하였다. 공작물 제거 속도는 축 방향의 열전도도보다 반경 방향의 열전도도가 증가할 때 더욱 커지는 것으로 나타났다.

점 전극을 이용한 마이크로 전해현상의 고찰 (A Study on the micro-electrochemical phenomenon using point electrode method)

  • 김봉규;박규열
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.1093-1096
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    • 2001
  • Eletrochemical phenomenon are employed in the manufacturing of micro-electrochemical machining(micro-ECM). The application of controlled electrochemical metal removal in the fabrication of microstructures and microcomponents is refer to as micro-electrochemical machining. In this paper, we introduce a new method named $\ulcorner$point-electrode electro chemical machining method$\lrcorner$ was proposed to establish micro fabrication technology by use of electrochemical machining. And we find effect of the electrochemical phenomenon in several conditions.

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마이크로 전기${\cdot}$화학 복합형상 제거시스템 (Microfactory for Electro-Chemical Machining)

  • 이희원;국경훈;김기원;김태곤;유병한;정재원;한민섭;정영훈;민병권;이상조
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2005년도 춘계학술대회 논문집
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    • pp.389-394
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    • 2005
  • Microfactory is effective method for machining micro size component. Electro-chemical machining can be more suitable to a microfactory than other machining methods in terms of maintaining high accuracy. Surface profile of EDM Machined component is predicted by micro EDM simulation using superpositioning spark crater. Planar motor and micro pump are developed to construct microfactory system.

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초음파 진동을 이용한 취성재료 가공기술에 관한 연구 (A Study on Micro Ultrasonic machining for Brittle Material Using Ultrasonic vibration)

  • 이석우;최헌종;이봉구
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.969-972
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    • 1997
  • Ultrasonic machining technology has been developed over recent years for he manufacture of cost-effective and quality-assured precision parts for several industrial application such as optics, semiconductors, aerospace, and automobile application. The past decade has seen a tremendous in the use of ceramic in structural application. The excellent thermal, chemical and wear resistance of these material can be realized because of recent improvement in the overall strength and uniformity of advanced ceramics. Ultrasonic machining, in which abrasive particles in slurry with water are presented to the work surface in the presence of an ultrasonic-vibrating tool, is process which should be of considerable interest, as its potential is not limited by he electrical or chemical characteristics of the work material, making it suitable for application to ceramics. In order to improve the currently used ultrasonic machining using ultrasonic energy, technical accumulation is needed steadily through development of exciting device of ultrasonic machine composed of piezoelectric vibrator and horn. This paper intends to further the understanding of the basic mechanism of ultrasonic machining for brittle material and ultrasonic machining of ceramics based in the fracture-mechanic concept has been analyzed.

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미세 전해가공 기술 동향 (Review of Micro Electro-Chemical Machining)

  • 신홍식
    • 융복합기술연구소 논문집
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    • 제2권2호
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    • pp.25-29
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    • 2012
  • Micro machining technologies have been required to satisfy various conditions in a high-technology industry. Micro electrochemical process is one of the most precision machining methods. Micro electrochemical process has been divided into electrochemical etching through protective layer and electrochemical machining using ultrashort voltage pulses. Micro shaft can be fabricated by electrochemical etching. The various protective layers such as photo-resist, oxide layer and oxidized recast layer have been used to protect metal surface during electrochemical etching. Micro patterning on metal surface can be machined by electrochemical etching through protective layer. Micro hole, groove and structures can be easily machined by electrochemical machining using ultrashort voltage pulses. Recently, the groove with subnanometer was machined using AFM.

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우리나라 초정밀가공기술의 기초연구동향 분석 연구 (A Study on Basic Research Trends of Ultra-Precision Machining Technology in Korea)

  • 박원규;이대명;홍원화
    • 한국생산제조학회지
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    • 제20권1호
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    • pp.86-95
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    • 2011
  • Ultra-precision machining technology is the essential core technology in today's micro-electronics and electro-optical industries. The needs for processing systems to manufacture products to nanometer(nm) accuracy and sub-nanometer resolutions are increased recently. By using ion beam, it is possible to fabricate ultra-precision and ultra-fine products with nm accuracy and sub-nm resolution. In this paper, the basic research trends of ultra precision machining technology in domestic are surveyed, and the ways to reach to the world-leading level of basic research capabilities in the field of ultra-precision machining technology in domestic is suggested.

전해액 내 혼합된 미세 전도성 입자를 이용한 전해 방전 가공의 형상 정밀도 향상 (Improvement of Geometric Accuracy using Powder Mixed Electro-chemical Discharge Machining Process)

  • 한민섭;민병권;이상조
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.366-369
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    • 2005
  • Electrochemical discharge machining (ECDM) has been found to be potential fur the micro-machining of non-conductive materials such as ceramics or glass. However this machining process has its own inherent problem that the reproducibility is too low to get the available geometric accuracy fur micromachining applications. One main challenge in reaching this goal is the control of the hydrogen built around the tool-electrode in which happen the discharges. This paper proposes the methods to improve the geometric accuracy using powder-mixed ECDM process. The experimental results show the effects of powder producing improved geometric accuracy by averaging and decreasing the concentration of spark energy.

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