• 제목/요약/키워드: Electrochemical machining

검색결과 123건 처리시간 0.028초

레이저 빔 가공과 전해 에칭을 이용한 미세 가공 (Micromachining Using Laser Beam Machining and Electrochemical Etching)

  • 김장우;권민호;정도관;주종남
    • 한국정밀공학회지
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    • 제29권10호
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    • pp.1089-1095
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    • 2012
  • Laser beam machining (LBM) using nanosecond pulsed laser is widely known to be rapid and non-wear process for micromachining. However, the quality itself cannot meet the precision standard due to the recast layer and heat affected zone. In this paper, a fabrication method for machining micro features in stainless steel using a hybrid process of LBM using nanosecond pulsed laser and electrochemical etching (ECE) is reported. ECE uses non-contacting method for precise surface machining and selectively removes the recast layer and heat affected zone produced by laser beam in an effective way. Compared to the single LBM process, the hybrid process of LBM and ECE enhanced the quality of the micro features.

전해가공을 이용한 Nitinol 형상기억합금의 그루브 패턴 가공특성에 관한 연구 (The Machining Characteristics of Groove Patterning for Nitinol Shape Memory Alloy Using Electrochemical Machining)

  • 신태희;김백겸;백승엽;이은상
    • 한국생산제조학회지
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    • 제18권6호
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    • pp.551-557
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    • 2009
  • A development of smart materials is becoming a prominent issue on present industries. A smart material, included in functions, is needed for micro fabrication. A shape memory alloy(SMA) in a smart material is best known material. Ni-Ti alloy, composed of nikel and titanium is one of the best shape memory alloy(SMA). Nitinol SMA is used for a lot of high tech industry such as aero space, medical device, micro actuator, sensor system. However, Ni-Ti SMA is difficult to process to make a shape and fabrications as traditional machining process. Because nitinol SMA, that is contained nikel content more than titanium content, has similar physical characteristics of titanium. In this paper, the characteristics of ECM grooving process for nitinol SMA are investigated by experiments. The experiments in this study are progressed for power, gap distance and machining time. The characteristics are found each part. Fine shape in work piece can be found on conditions; current 6A, duty factor 50%, gap distance 15%, gap distance $15{\mu}m$, machining time 10min.

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역방전 가공을 이용한 미세 전극 제작과 그 응용 (Fabrication of Micro Electrodes by Reverse EDM and Its Applications)

  • 최세환;김보현;박병진;주종남
    • 한국정밀공학회지
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    • 제22권11호
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    • pp.159-164
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    • 2005
  • For increasing productivity of micro electrochemical machining (MECM), the application of multiple electrodes was introduced. The electrodes were fabricated by reverse electrical discharge machining (REDM). By REDM micro electrodes with various shapes can be machined easily. According to capacitance and applied voltage, machining characteristics of reverse EDM were investigated and the optimal conditions for stable machining were suggested. By using multiple electrodes and a channel-shape electrode, holes and channels were machined on stainless steel by ECM.

펄스전해가공을 이용한 인바 박판의 가공 형상 및 Overcutting 현상에 관한 연구 (A Study on Processing Shape and Overcutting of Invar Sheet by Pulse Electrochemical Machining)

  • 양부열;김성현;최승건;최웅걸;전광호;이은상
    • 한국생산제조학회지
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    • 제24권3호
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    • pp.314-319
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    • 2015
  • Invar is a compound metal of Fe-Ni system contained 36.5% Ni. The characteristic of invar is that the coefficient of thermal expansion is $1.0{\times}10^{-6}cm/^{\circ}C$. It is approximately 10 times smaller than series of steel. Because of this low thermal expansion characteristic of Invar, it is used to shadow mask of display device such as UHDTV or OLED TV. In this study, pulse current from pulse generator instead of DC current is used to overcome the disadvantages of the conventional electrochemical machining. Pulsed current with different duty factor in PECM affect the precise geometry. Pulse electrochemical machining is conducted to machine the micro hole to the invar sheet with different duty factor. The machined shape and overcut of invar sheet with different duty factor is observed by optical microscope and scanning electron microscope (SEM).

전압 주파수와 파형 폭 변화에 따른 유리의 미세 전해 방전 가공 성능에 대한 실험 (The Experiment on the effect of variations of voltage frequency and duty r on the electrochemical discharge machining of Pyrex glass)

  • 이정용;안유민;안시홍;박치현;김용권
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 G
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    • pp.3307-3309
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    • 1999
  • Electrochemical discharge machining (ECDM) is a very recent technique in the fabrication of the micro-electro-mechanical system ( MEMS ) devices. This paper presents the experimental results of the machining of micro-holes on pyrex glass substrates by use of ECDM. Electrolyte is used with a KOH aqueous solution, cathode with copper, anode with platinum, and tool feed system is applied with gravity feed system. Already established experimental results were taken under the condition of constant voltage frequency. However in this paper, the effect of variation of the voltage frequency and duty ratio is considered. In this experiment, it is measured the ECDM performances with variation of the voltage frequency and duty ratio under the conditions of constant other machining variables. ECDM performances are described by the hole depth, and the top hole diameter.

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