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Fan Chen,Guojian Mei,Bo Zhao,Wenbo Bie,Guangxi Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
Three-dimensional (3D) ultrasonic vibration-assisted ELID grinding, which combines 3D ultrasonic vibration-assistance with electrolytic in-process grinding wheel dressing (ELID), is a compound process that is designed to achieve high-efficiency precision machining. A grinding force model of 3D ultrasonic vibration-assisted ELID grinding was first developed on the basis of the kinematics of a single grit particle and was verified through experimentation. The surface quality then was observed using white light interference profiling. It was demonstrated during the present investigation that the grinding force during 3D ultrasonic vibration-assisted ELID grinding was approximately 20 %~30 % lower than that of twodimensional (2D) ultrasonic vibration-assisted ELID grinding. In addition, the surface roughness (Ra) achieved during 3D ultrasonic vibration-assisted ELID grinding was approximately 40 %~50 % smoother than was achieved under 2D ultrasonic vibration-assisted ELID, and thus 3D ultrasonic vibration-assisted ELID grinding can achieve better surface quality.
곽태수(Tae-soo Kwak),한태성(Tae-sung Han),정명원(Myung-won Jung),김윤지(Yunji Kim),우에하라 요시히로(Yosihiro Uehara),오오모리 히토시(Hitoshi Ohmori) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.12
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.
MLCC 적층용 진공척의 자기연마와 ELID연삭을 이용한 미세 버 제거
이용철,신건휘,곽태수 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.3
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.
Development of Auto-Control Power Supply of ELID Electrolysis Speed for Metal-Bonded Grinding Wheel
신건휘(Gun-Hwi Shin),곽태수(Tae-Soo Kwak) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.11
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 automaticcontrol 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.
In-Process Measurement of ELID Grinding Status -Thickness of Insulating layer-
Ahn, Jung-Hwan,Kim, Hwa-Young,Seo, Young-Ho,Paik, In-Hwan The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.9
To successfully establish the ELID-grinding, it is important to properly select the electrolytic condition according to grinding conditions. Currently, the selection of electrolytic condition is mainly dependent on the operators experience, which is one of difficulties preventing the successful application of ELID technique. In this study, an in-process measurement system of the insulating layer using two gap sensors-a capacitance type and an eddy current type-are developed and the change of the thickness of insulating layer during ELID grinding is detected. Evaluation experiments show the possibility to control the electrolytic condition through the in-process measurement of the layer status.
사파이어 의료용 나이프의 연삭가공에서 지그의 탄성계수가 날 부 형상에 미치는 영향
신건휘(Gun-Hwi Shin),강병욱(Byung-Ook Kang),곽태수(Tae-Soo Kwak) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
This study determines the selection of an appropriate jig material for the blade edge of the medical sapphire knife. The physical properties of the jig material affects the edge shape and chipping phenomenon in machining of the medical sapphire knife. If a grinding wheel is used, brittle workpieces such as sapphire are easily damaged by the propagation of cracks because the grinding force significantly increases. It is important to constantly maintain the grinding force in the grinding process of the brittle materials. The grinding force can be kept constantly by inducing the elastic deformation of the Jig material because the elastic deformation of brittle work-piece is negligibly low. The chipping phenomenon may be reduced by selecting the proper Jig material. Aluminum, copper, stainless steels and carbon steel were used as Jig materials. The experiment was conducted using a cast iron grinding wheel, which was installed on a conventional grinding machine with the ELID grinding system. The thickness and width of the chipping area were measured using an optical microscope and FE-SEM to analyze the shape of the blade edge. According to the experiment result, the chipping phenomenon decreased, and the sharp edge was formed when the jig materials with low elastic modulus were used.
강종호(Jong-Ho Kang),이명현(Myung-Hyun Lee),서원선(Won-Seon Seo),이석원(Suk-Won Lee),곽태수(Tae-Soo Kwak),최헌진(Heon-Jin Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
We investigated the cell activity of controlled titanium surface using various grinding methods including ELID (Electrolytic In-Process Dressing) grinding method. The influence of titanium surface condition by each grinding process on the cell activity was evaluated by ALP activity of MSC(Mesenchymal Stem Cells). The ALP activity of controlled surface by ELID grinding process using # 2000 wheel was higher than that of other titanium surface. The morphological, chemical properties of machined surface by grinding method was observed using various analytical method.
초음파 진동 테이블이 질화알루미늄 세라믹의 ELID 연삭 가공에 미치는 영향
곽태수(Tea-Soo Kwak),정명원(Myung-won Jung),김건희(Geon-Hee Kim),곽인실(Ihn-Sil Kwak) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
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.
볼 베어링용 질화규소 세라믹스의 ELID연삭에서 파괴인성이 표면거칠기에 미치는 영향
이승민(Seung-Min Lee),김하늘(Ha-Neul Kim),고재웅(Jae-Woong Ko),곽태수(Tae-Soo Kwak) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.12
The purpose of this study is to evaluate the effect of fracture toughness of silicon nitride ceramics for ball bearings on surface machining and apply it to the deveopment of silicon nitride ceramics with excellent machinability. For the experiment, the surface machining characteristics were evaluated by applying Electrolytic In-process Dressing, ELID grinding technology using for nanosurface generation processing of ceramics. #325 diamond grinding wheel is used in the roughing processes to remove surface defects that occur in sintering process of ceramics and to increase the material romoval rate. #1200 diamond grinding wheel is used to remove grinding marks created in the roughing process. The surface roughness and surface images were measured using surface roughness tester and Field Emission Scanning Electron Microscopy, FE-SEM for comparative analysis of the ground surface. As a result of the experiment, it was found that the workpiece with high fracture toughness had excellent surface roughness, while the workpiece with relatively low fracture toughness had worse surface roughness.