• 제목/요약/키워드: Micro electrochemical machining

검색결과 87건 처리시간 0.02초

미세 내부 형상 가공을 위한 디스크 전극 이용 전해 가공 (Electrochemical Machining Using a Disk Electrode for Micro Internal Features)

  • 조찬희;김보현;주종남
    • 한국정밀공학회지
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    • 제25권7호
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    • pp.139-144
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    • 2008
  • Micro electrochemical machining was investigated to machine micro internal features. This method uses a micro disk tool electrode and can easily machine micro features inside of a micro hole, which are very difficult to make by the conventional processes. In order to limit the machining area and localize the electrochemical dissolution, ultra short pulses were used as power source and a micro disk electrode with insulating layer on its surface was used as a tool electrode. By electrochemical process, internal features, such as groove array, were fabricated on the stainless steel plate.

초경합금의 미세 전해 가공 (Micro Electrochemical Machining of Tungsten Carbide)

  • 최세환;주종남;김보현
    • 한국정밀공학회지
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    • 제23권12호
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    • pp.111-116
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    • 2006
  • Micro machining of tungsten carbide by electrochemical machining was studied. In ECM, machining conditions and electrolyte should be chosen carefully according to the property of workpiece materials. In this paper, sulfuric acid and nitric acid were used for tungsten carbide machining and machining characteristics were investigated according to machining conditions such as electrolyte, workpiece potential and applied pulse voltage. By using mixture of sulfuric acid and nitric acid, micro structures with sharp edge and good surface quality were obtained. Micro electrochemical turning was also introduced to fabricate micro shafts.

알루미늄에 대한 미세 표면 전해가공에 관한 연구 (A study on the Micro Surface Electrochemical Machining for Aluminum Alloy)

  • 백승엽;이은상;원찬희
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 추계학술대회 논문집
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    • pp.214-217
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    • 2002
  • Micro Surface Electrochemical Machining has traditionally been used in highly specialized fields such as those of the aerospace and defense industries. It is now increasingly being applied in other industries where parts with difficult-to-cut material, complex geometry and tribology such as compute. hard disk drive(HDD) are required. Pulse Electrochemical Micro-machining provides an economical and effective method for machining high strength, high tension, heat-resistant materials into complex shapes such as turbine blades of titanium and aluminum alloys. Usually aluminum alloys are used bearings to hard disk drive in computer. In order to apply aluminum alloys to bearing used in hard disk drive, this paper presents the characteristics of Micro Surface Electrochemical machining for aluminum alloy.

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절연 전극을 이용한 미세 전해 가공 (Micro Electrochemical Machining Using Insulated Electrode)

  • 박병진;김보현;주종남
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.685-688
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    • 2005
  • In the micro electrochemical machining (MECM) using ultra short pulses, the machining rate is closely related to the tool electrode area. The machining rate varies according to the machining depth or the immersion depth. When using insulated tool electrodes, those depths do not matter. In addition, micro structures with high machining depth can be fabricated because the machining characteristics do not vary with the machining depth. Another advantage of insulated electrodes is prevention of taper shape. Micro structures with high machining depth or high aspect ratio were fabricated using insulated tool electrodes.

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디스크 전극을 이용한 미세 전해 밀링 가공에서의 테이퍼 형상 방지 (Taper Reduction in Micro Electrochemical Milling Using Disk-type Electrode)

  • 김보현;이영수;최덕기;주종남
    • 한국정밀공학회지
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    • 제22권4호
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    • pp.167-172
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    • 2005
  • In this paper. micro electrochemical machining (ECM) for micro structure fabrications is presented. By applying ultra short pulses. the chemical reaction can be restricted only to the region very close to the electrode. Micro ECM is applied to machining micro structures through electrochemical milling process becasuse it doesn't suffer from tool wear. Using this method. 3D micro structures were machined on stainless steel. It was found that micro machining is possible with good surface quality in the low concentration electrolyte,0.1 M H₂SO₄. In ECM, as the machining depth increases, better flushing of electrolyte is required for sufficient ion supply. Layer-by-layer milling is advantageous in flushing. However, layer-by-layer milling causes taper of structures. To reduce the taper, application of a disk-type electrode was introduced. By electrochemical milling, various 3D micro structures including a hemisphere with 60 ㎛ diameter were fabricated.

미세 홈 형성을 위한 마이크로 전해가공에 관한 연구 (A Study on the Electrochemical Micro-machining for Fabrication of Micro Grooves)

  • 박정우;이은상;문영훈
    • 한국정밀공학회지
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    • 제19권4호
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    • pp.101-108
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    • 2002
  • A specially-built EMM (Electrochemical Micro Machining) / PECM (Pulse Electrochemical Machining) cell, a electrode tool filled with non-conducting material, a electrolyte flow control system and a small & stable gap control unit are developed to achieve accurate dimensions of recesses. Two electrolytes, aqueous sodium nitrate and aqueous sodium chloridc arc applied in this study. The farmer electrolyte has better machine-ability than the latter one because of its appropriate changing to the transpassive state without pits on the surface of workpiece. It is easier to control the machining depth precisely by micrometer with pulse current than direct current. This paper also presents an identification method for the machining depth by in-process analysis of machining current and inter electrode gap size. The inter electrode gap characteristics, inc1uding pulse current, effective volumetric electrochemical equivalent and electrolyte conductivity variations, are analyzed based on the model and experiments.

마이크로 전해가공에서 임피던스의 영향 (The influence of impedance on micro electrochemical machining)

  • 강성일;주종길;박규열;전종업
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1893-1896
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    • 2003
  • This research aimed to fabricate a micro structure using micro electrochemical machining (${\mu}$-ECM). with a view to that the theory of ${\mu}$-ECM is established accurately in a different way of conventional electrochemical machining. In details, if the impedance is existed in the system, it is difficult to analyze the micro electrochemical reaction efficiently in polarization curve using a potentiodynamic test. Hence, this research investigates the relationships between impedance and electric current measuring with a potentiostatic test applying to a pair or electrode as a constant potential. And this paper examines the influence of temperature of electrolyte on polarization curve for the quantitative analysis of electrochemical reactions.

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복합기능 전극을 이용한 미세 전해가공 (Micro Electrochemical Machining Using a Multi-Function Electrode)

  • 신홍식;김보현;김규만;정도관;주종남
    • 대한기계학회논문집A
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    • 제33권5호
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    • pp.496-501
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    • 2009
  • In micro electrochemical machining(micro-ECM), it is important to measure and control the potential of a tool electrode and a workpiece electrode because electrochemical reaction rate depends on the potential of the electrodes. When the electrode potential was measured against a reference electrode, the error of measured electrode potential could be minimized by proper tool electrode design. In this paper, multi-function electrodes consisting of a tool electrode and a reference electrode was fabricated by micro fabrication techniques. The machining conditions in micro-ECM using multi-function electrodes, such as pulse voltage parameters and electrode potential, were investigated.

구연산을 이용한 스테인레스 스틸의 미세 전해가공 (Micro Electrochemical Machining of Stainless Steel Using Citric Acid)

  • 류시형
    • 한국정밀공학회지
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    • 제25권3호
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    • pp.134-140
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    • 2008
  • Micro electrochemical machining (ECM) is conducted on stainless steel 304 using non-toxic electrolyte of citric acid. Electrochemical dissolution region is minimized by applying a few hundred second duration pulses between the tungsten SPM tip and the work material. ECM characteristics according to citric acid concentration, feeding velocity and electric conditions such as pulse amplitude, pulse frequency, and offset voltage are investigated through a series of experiments. Micro holes of $60{\mu}m$ in diameter with the depth of $50{\mu}m$ and $90{\mu}m$ in diameter with the depth of $100{\mu}m$ are perforated. Square and circular micro cavities are also manufactured by electrochemical milling. This research can contribute to the development of safe and environmentally friendly micro ECM process.

방전/전해 가공을 이용한 미세금형가공 (Micro Mold Machining Using EDM/ECM)

  • 정도관;신홍식;최세환;김보현;주종남
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2007년도 춘계학술대회 논문집
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    • pp.75-78
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    • 2007
  • Recently, the need for micro mold or micro mechanical parts has been rapidly increased. As feature size decreases, conventional machining processes show their limitation. Micro electrical discharging machining (EDM) and electrochemical machining (ECM) have many advantages in micro machining. They can be used to make structures of micro scale, or even nano scale size. In this paper, the application of micro EDM and ECM has been investigated.

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