• 제목/요약/키워드: Electrochemical machining

검색결과 123건 처리시간 0.031초

유리의 미세 가공을 위한 구리 전극군의 제작과 전기 화학 방전 가공 시험 (Fabrication of Copper Electrode Array and Test of Electrochemical Discharge Machining for Micro Machining of Glass)

  • 정주명;심우영;정옥찬;양상식
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제53권9호
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    • pp.488-493
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    • 2004
  • In this paper, we present the fabrication of copper electrode array and test of electrochemical discharge machining(ECDM) for glass machining. An array of 72 Cu electrodes is used to machine Borofloat33 glass. The height and diameter of a Cu electrode are 400 $\mu\textrm{m}$ and 100 $\mu\textrm{m}$ respectively. It is fabricated by ICP-RIE, Au-Au thermo-compression bonding, and copper electroplating. Borofloat33 glass is machined by the fabricated copper electrode array in 60 seconds at 55 V. The surface roughness of the machined glass is measured and the machined glass is anodically bonded with silicon.

미세 레이저 가공의 표면코팅 후 전해 에칭 (Laser Micro Machining and Electrochemical Etching After Surface Coating)

  • 김태풍;박민수
    • 한국정밀공학회지
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    • 제30권6호
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    • pp.638-643
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    • 2013
  • Laser beam machining (LBM) is fast, contactless and able to machine various materials. So it is used to cut metal, drill holes, weld or pattern the imprinted surface. However, after LBM, there still leave burrs and recast layers around the machined area. In order to remove these unwanted parts, LBM process often uses electrochemical etching (ECE). But, the total thickness of workpiece is reduced because the etching process removes not only burrs and recast layers, but also the entire surface. In this paper, surface coating was performed using enamel after LBM on metal. The recast layer can be selectively removed without decreasing total thickness. Comparing with LBM process only, the surface quality of enamel coating process was better than that. And edge shape was also maintained after ECE.

전해 가공을 이용한 WC 미세축 제작 (WC Micro-shaft Fabrication Using Electrochemical Etching)

  • 최세환;류시형;최덕기;주종남
    • 한국정밀공학회지
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    • 제21권6호
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    • pp.172-178
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    • 2004
  • Tungsten carbide microshaft can be used as various micro-tools for MEMS because it has high hardness and high rigidity. In this study, experiments are performed to produce tungsten carbide micro-shaft using electrochemical etching. H$_2$SO$_4$ solution is used as electrolyte because it can dissolve tungsten and cobalt simultaneously. Optimal electrolyte concentration and machining voltage satisfying uniform shape, good surface quality, and high MRR of workpiece are experimentally found. By controlling the various machining parameters, a straight micro-shaft with 5 ${\mu}{\textrm}{m}$ diameter, 3 mm length, and 0.2$^{\circ}$taper angle was obtained.

미세 펄스 전압을 이용한 마이크로 전해가공에 관한 연구 (A study of electrochemical micromachining with voltage pulses)

  • 조창래;백승엽;이은상
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.356-361
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    • 2003
  • Electrochemical micromachining which is not normally considered as a precision process is presented in this paper. The application of voltage Pulses between a tool electrode and a workpiece in an electrochemical environment allows the three-dimensional machining of conducting materials with micrometer precision. In this paper tool-electrodes($5\mu\textrm{m}$ in diameter, 1mm in length) are developed by electrochemical micromaching and micro holes are manufactured using this tool-electrodes we developed already. Micro holes are achieved the accuracy below $50\mu\textrm{m}$ in diameter using ultrashort voltage pulses(0.1-5$\mu\textrm{s}$).

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스테인리스 망의 전기화학 폴리싱(ECP) 조건에 따른 가공 특성 (Machining Characteristics according to Electrochemical Polishing (ECP) Conditions of Stainless Steel Mesh)

  • 김욱수;박정우
    • 한국기계가공학회지
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    • 제14권6호
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    • pp.41-48
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    • 2015
  • Stainless steel mesh has been used as a filter in various fields, including domestic, medical, etc. However, the surface before machining may have an adverse effect the product quality and performance because it is not smooth. Especially, adsorbed impurities in the surface result in difficulty in cleaning. Therefore, in this paper, we propose an improved surface quality through electrochemical polishing (ECP). Two electrodes, composed of STS304 (anode) and copper (cathode) underwent machining with two conditions according to polishing time and current density. As the polishing time and current density increase, the surface of curvature decreases, and roughness and material removal rate (MRR) improves. The machined surface roughness and image were obtained through the atomic force microscope (AFM) and stereoscopic microscope. The study also analyzed hydrophilic effect through contact angles. This obtains corrosion resistance, smoothness, hydrophilic property, etc.

전해가공 시의 정밀도위 향상을 위한 음극 설계와 모사 (Cathode design and simulation in electrochemical machining)

  • 유시철;조수익;손헌준;강탁
    • 한국표면공학회지
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    • 제30권4호
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    • pp.239-247
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    • 1997
  • The electrochemical machining of carbon steel was carried in various electrolytes which contain NACl and $NaCIO_3$. Though electrolyte containg NaCl yields fast machining rate, dimensional control is rather difficult. In the case of electrolyte with $NaCIO_3$, dimensional control of anode shape can be obtained through modification of cathode design. Mathematical modeling is also performed for these systems and agreements are good compared with experimental date. The constant gap experiment butween two electrode yielded faster machining rate than constant cathode moving rate experiment.

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마이크로 펄스 전해 복합가공에 관한 연구 (Study on the new development of combined electrochemical processes using pulse current)

  • 박정우;이은상;문영훈
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 춘계학술대회 논문집
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    • pp.918-921
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    • 2002
  • Some investigators who have tried to achieve the highly smooth surface finish using electrochemical processes have reported that high current density produced lustrous surfaces while the opposite conditions produced a passive layer and had a tendency to produce a black surface. However, processing at a low current density may produce a non-lustrous surface but the improvement of dimensional accuracy of the surface is significant. The surface with pulse process was a bit more lustrous than with continuous current but the black passive layer still could be found at grooved surface. There are two ways to achieve highly smooth surface finish. One is brushing it with a brush the other is electrochemical machining (ECM) with high current. The former method is the most common polishing practice, but not only may the surface obtained differ from operator to operator, but precision smooth surface on micro grooves are difficult to obtain. The latter one recently has been used to produce a highly smooth surface after EDM process. However, the material removal rate in ECM with high current is relatively high. Hence the original shape of the micro grooves, which was formed by electrochemical micro-machining (EMM) process, may be destroyed. In this study, an electrochemical polishing process using pulse current is adopted as a possible alternative process when micro grooves formed by EMM process should be polished. Mirror-like micro grooves with lustrous and smooth surface can be produced electrochemically with pulse current because the voltage and current used can be lower than the case of continuous current. This study will discuss the accurate control of physical and electrical conditions so as to achieve mirror-like micro grooves with lustrous and smooth surface without destroying the original shape of micro grooves.

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입방정질화붕소입자 전착지석에 의한 전해디버링 시스템 (Electrochemical Deburring System by the Electroplated CBN Wheel)

  • 최인휴
    • 대한기계학회논문집A
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    • 제21권3호
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    • pp.430-438
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    • 1997
  • Deburring and edge finishing technology as the final process of machining operation is required for manufacturing of advanced precise conponents. But, deburring is considered as a difficult problem on going to the high efficient production and automation in the FMS. Removal of burr couldn't have a standard of its definition because of its various shapes, dimensions and properties and mostly depends on manual treatment. Especially, deburring for cross hole inside is very difficult owing to its shape passing through out perpendicular to a main hole. The electrochemical method is suggested as its solution in practical aspect. Therefore, electrochemical deburring technology needs to be developed for the high efficiency and automation of internal deburring in the cross hole. In this study, the new process in the eliminating burr inside cross hole, electrochemical deburring by the wheel electroplated with Cubic-Boron-Nitrade abrasives, is suggested. Its deburring mechanism is described and machining performances is investigated. Also, CBN electroplated wheel is designed and manufactured and then characteristics of electrochemical deburring are investigated through experiments. Overall electrochemical deburring performance against burr inside cross hole is examined in the various power sources such as peak current and direct current.