• Title/Summary/Keyword: ELID

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Development of ELID Monitoring System and its Application to ELID Grinding of Structural Ceramics (ELID 연삭 모니터링 시스템의 개발과 구조 세라믹스 적용 사례)

  • Kwak, Tae-Soo;Kim, Gyung-Nyun;Kwak, Ihn-Sil
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.12
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    • pp.1245-1251
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    • 2013
  • This study has focused on development of ELID monitoring system and its application to ELID grinding of structural ceramics. ELID monitoring system was consisted of grinding equipment, ELID power supply, grinding wheel, electrode and monitoring program. It can give a real time data to check spindle grinding resistance, wheel revolution, dressing current and voltage in ELID grinding process. The performance of developed system was evaluated by applying to grinding of structural ceramics, silicon carbide and alumina. As the results of experiments, monitored data for spindle resistance and ELID dressing current was useful to check steady-state ELID grinding process. From the comparison of spindle resistance between ELID grinding and conventional grinding process according to change of depth of cut, it could be confirmed that the spindle resistance in ELID grinding was lower than conventional grinding process.

Internal Cylindrical Grinding with Super Abrasive Wheel and Electrolytic In- process Dressing (ELID를 이용한 초미립 숫돌의 원통내면연삭)

  • Jun Qian;Gyung Nyun Kim;Hitoshi Ohmori;Hae Do Jeong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.4
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    • pp.155-162
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    • 2000
  • 전해 인프로세스 드레싱(ELID)의 응용기술로써 간헐적 드레싱(ELID II) 및 무전극 드레싱(ELID III)이 원통내면 마무리 연삭에 이용되고 있다. 주철본드(CIB-D) 및 메탈레진본드 다이아몬드 숫돌(HRB-D)이 이 방식들에 사용되고 있다. 경면 가공에 있어서 이 두방식은 미립의 숫돌이용으로 일반연삭기에 정밀부속 장치의 보완없이 이용될 수 있다. ELID II 연삭에서 CIB-D숫돌은 파이프 형상의 전극에 의하여 간헐적으로 드레싱되고, 반면에 MRB-D 숫돌은 인프로세스 드레싱 되며 전극은 필요로 하지 않는다. 본 연구에서는 ELID II 및 ELID III 방식에 있어서, 연삭조건 및 연삭입자크기에 대한 연삭특성을 비교검토 하였다. 그 결과, ELID II, III방식 공히 대단히 작은 표면거칠기를 갖는 경면이 얻어짐을 확인하였다.

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A Study on Characteristics of ELID Lapping for Sapphire Wafer Material (사파이어 웨이퍼의 ELID 랩핑 가공 특성에 관한 연구)

  • Kwak, Tae-Soo;Han, Tae-Sung;Jung, Myung-Won;Kim, Yunji;Uehara, Yosihiro;Ohmori, Hitoshi
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.12
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    • pp.1285-1289
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    • 2012
  • This study has been focused on application of ELID lapping process for mirror-surface machining of sapphire wafer. Sapphire wafer is a superior material with optic properties of high performance as light transmission, thermal conductivity, hardness and so on. High effective surface machining technology is necessary to use sapphire as various usages. The interval ELID lapping process has been set up for lapping of the sapphire material. According to the ELID lapping experimental results, it shows that 12.5 kg of load for lapping is most pertinent to ELID lapping. the surface of sapphire can be eliminated by metal bonded wheel with micron abrasives and the surface roughness of 60 nmRa can be gotten using grinding wheel of 2,000 mesh in 4.5 um, depth of cut. In this study, the chemical experiments after ELID grinding also has been conducted to check chemical reaction between workpiece and grinding wheel on ELID grinding process. It shows that the chemical reaction has not happened as the results of the chemical experiments.

Reserarch for Possibility of ELID Grinding of Hard Disk Glass (HDD용 Glass Disk의 ELID 연삭 성능 평가)

  • 김경년;김영태;박철우;이용철;대삼정;이상조
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.2
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    • pp.161-168
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    • 2000
  • In this paper, machining characteristics of glass for HDD media are researched. Nowadays HDD media are used globally as a data storage device. In generally, it is machined by the lapping. But the lapping process time is long and the productivity is low. In this reason, 1 examined the possibility of ELID grinding of glass fur HDD media. If the machining process of HDD media can be changed to ELID grinding, a product cost will be largely saved. The machines used in this experiment were a special rotary type grinder and a normal rotary grinder. The one has an air bearing spindle, the other has not. Experimental results show the possibility of highly efficient grinding and mirror surface can be achieved by the ELID grinding.

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A Study on the Generation of Mirror-like Surface and Simulation in Grinding Condition by Inprocess Electrolytic Dressing (연속 전해드레싱의 연삭조건변화에 의한 경면생성 및 시뮬레이션에 관한 연구)

  • 김정두;이연종
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.12
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    • pp.2962-2969
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    • 1993
  • Recently, a study on the mirror-like surface grinding of brittle materials is active and as branch of these study, new dressing method for superabrasive wheel, electrolytic inprocess dressing(Elid) was developed. Using Elid, the mirror-like surface of brittle material can be generated without polishing or lapping process. In the future, Elid grinding will take important place in industry. But so far the analysis on Elid grinding was not quantitative but qualitative. In this study, The purpose is the quantitative analysis on Elid grinding by computer simulation, For computer simulation, the mean and the variance of the abrasive distribution were measured by tracing of the grinding wheel with stylus in transverse direction in the case of respective dressing current condition. This measurement result in a density distribution of abrasive by mathematical formulation using statistical method. The prediction of the surface roughness in Elid grinding was based on this density distribution.

Deburring Technology of Vacuum Plate for MLCC Lamination Using Magnetic Abrasive Polishing and ELID Process (MLCC 적층용 진공척의 자기연마와 ELID연삭을 이용한 미세버 제거 기술)

  • Lee, Yong-Chul;Shin, Gun-Hwi;Kwak, Tae-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.3
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    • pp.149-154
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    • 2015
  • This study has focused on the deburring technology of a vacuum plate for MLCC lamination using electrolytic in-process dressing (ELID) grinding, and the magnetic-assisted polishing (MAP) process. The surface of the vacuum plate has many micro-holes for vacuum suction. They are easily blocked by the burrs created in the surface-flattening process, such as the conventional grinding process. In this study, the MAP process, the ELID grinding process, and an ultrasonic vibration table are examined to remove the micro-burrs that lead to the blockage of the holes. In the results of the experiments, the MAP process and ELID grinding technology showed significant improvements of surface roughness and deburring performance.

Properties of ELID Mirror-Surface Grinding for Single Crystal Sapphire Optics (단결정 사파이어 광학소자의 ELID 경면연삭 가공 특성)

  • Kwak, Jae-Seob;Kim, Geon-Hee;Lee, Yong-Chul;Ohmori, Hitoshi;Kwak, Tae-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.3
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    • pp.247-252
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    • 2012
  • This study has been focused on application of ELID mirror-surface grinding technology for manufacturing single crystal optic sapphire. Single crystal sapphire is a superior material with optic properties of high performance as light transmission, thermal conductivity, hardness and so on. Mirror-surface machining technology is necessary to use sapphire as optic parts. The ELID grinding system has been set up for machining of the sapphire material. According to the ELID experimental results, it shows that the surface of sapphire can be eliminated by metal bonded wheel with micron abrasives and the surface roughness of 60nmRa can be gotten using grinding wheel of 2,000 mesh in 4.5um, depth of cut. In this study, the chemical experiments after ELID grinding also has been conducted to check chemical reaction between workpiece and grinding wheel on ELID grinding process. It shows that the chemical reaction has not happened as the results of the chemical experiments.

The Effect of Ultrasonic Vibration Table on ELID Grinding Process of Aluminum Nitride Ceramics (초음파 진동 테이블이 질화알루미늄 세라믹의 ELID 연삭 가공에 미치는 영향)

  • Kwak, Tea-Soo;Jung, Myung-Won;Kim, Geon-Hee;Kwak, Ihn-Sil
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.12
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    • pp.1237-1243
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    • 2013
  • This study has focused on the effect of ultrasonic vibration table in ELID grinding process of aluminum nitride ceramics. Aluminum nitride ceramics has superior physical and chemical properties and widely used in IC, LSI substrate, package and so on. To achieve the high effective machining of brittle and high strength ceramics as like aluminum nitride, machining method combined ELID grinding and ultrasonic vibration has been adopted in this study. From the experimental results, material removal rate, MRR has been increased maximum 36 percent and spindle resistance has been decreased in using ultrasonic table. Surface roughness of ground surface became a little worse in using ultrasonic table but was somewhat improved in feed direction.

Development of Auto-Control Power Supply of ELID Electrolysis Speed for Metal-Bonded Grinding Wheel (금속결합제 연삭 숫돌의 ELID 전해속도 자동 조절장치 개발)

  • Shin, Gun-Hwi;Kwak, Tae-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.11
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    • pp.899-904
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    • 2016
  • ELID grinding is an excellent technique for the mirror grinding of the variety of the advanced metallic or nonmetallic materials. The focus of this study is the development of an automatic-control electrolysis-speed device for the automation of the ELID-grinding process. For the development of the automatic-control electrolysis-speed device, analysis experiments regarding the ELID cycle and oxide-layer removal and creation were conducted according to a truing and dressing process. Also, a comparative experiment was conducted to confirm the variance of the electrolysis speed in accordance with changes of the voltage. The experiment results for the developed automatic-control electrolysis-speed device show that the developed device could control the electrolysis speed according to voltage changes through the use of the data that are monitored during the ELID-grinding process.

High Efficient Cylindrical Grinding of Ferrous Materials Using Electrolytic In-process Dressing Method(ELID) (전해 인프로세스 드레싱법(ELID)을 이용한 철강재료의 고능률 원통연삭)

  • Lee, Deug Woo;Takahashi, I.;Ohomori, H.;Nakagawa, T.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.8
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    • pp.99-105
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    • 1995
  • This paper provides a highly efficient grinding for ferrous materials using ELID-grinding method. The grinding efficiency using ELID gring method with CIFB-cBN wheel and CB-cBN wheel is compared with general grinding method with V-cBN wheel. This paper measured grinding ratio for plunge grinding and grinding resistance for traverse grinding in order to investigate grinding ability. The results show that ELID grinding methods is useful for the high efficient grinding of ferrous materials.

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