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황성원(Sung Won Hwang),신귀수(Gwi Su Shin),김근주(Keunjoo Kim),서남섭(Nam Sup Suh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The sapphire wafer for blue light emitting davice was manufactured by the implementation of the chemical and mechanical polishing pricess. The surface polishing of crystalline sapphire wafer was characterized by zeta petentoal measurement, The reduction process with the alkali slurry provides the surface chemical reaction with sapphire atorms, The-poly urethane pad also provides the frictional force to take out the chemically-reacted. The surface roughness was measured by the atomic force mieroscope and the crystalline quality was characterized by the double erystal X-ray diffraction analysis.
황성원(Sung Won Hwang),신귀수(Gwisu Shin),김근주(Keunjoo Kim),서남섭(Nam Sup Suh) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.2
The sapphire wafers for blue light emitting devices were manufactured by the implementation of the surface machining technology based on micro-tribology. This process has been performed by Micro-lapping process. The sapphire crystalline wafers were characterized by double crystal X-ray diffraction. The sample quality of crystalline sapphire wafer at surface has a full width at half maximum of 250 arcsec. This value at the surface sapphire wafer surfaces indicated 0.12㎛ sizes. Surfaces of sapphire wafers were mechanically affected by residual stress and surface default. As a result, the value of surface roughness of sapphire wafers measured by AFM(Atom Force Microscope) was 2.1㎚.
절삭력 및 음향방출법에 의한 절삭공구의 파손검출에 관한 연구
두승,서한원,서남섭 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-
In order to improve reliability and productivity in automatic factory system without human supervision, it is essential to detect cutting tool fracture in machine system. Therefore, several methods have been studied to detect cutting tool fracture. In this study, the feasiblility of using dual signals which are cutting force signal and acoustic emssion signal for the detection of cutting tool fracture was investigated. The experimental investigation is mainly focused on a tool fracture as well as cutting condition by cutting force signal and acoustic emssion signal. Turning experiments were performed using high speed precision lathe and carbide inser tool under realistic cutting condition. And STS304 was used as a workpiece. This study illustrated the sensitivities of the cutting force signals and acoustic emission signal to the fracture of cutting tool and estimated several kinds of signal characteristics in tool fracture processing.