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[論文] 2차원 절삭과정에서의 Acoustic Emission과 절삭 파라미터 사이의 관계
최성주(S.J.Choi),강명순(M.S.Kang) 한국자동차공학회 1987 오토저널 Vol.9 No.2
The objective of this study is to establish the comprehensive analytical relationship between acoustic emission and fundamental parameters of the orthogonal cutting process.<br/> The sources of acoustic emission in the orthogonal metal cutting process was identified as deformation in the shear zone and sliding friction at the chip-tool interface.<br/> The validity of this relationship is evaluated by a series of tests varing cutting speed and rake angle for A16063 tube. Strong dependence of the RMS voltage of acoustic emission on cutting speed and rake angle was observed.<br/> It was also found that the percentage contribution of AE energy at each zone for the total AE activity is constant in accordance with the change of cutting speed.<br/> The relationship between the RMS of acoustic emission and the fundamental cutting parameters was modified in order to be utilized independent of rake angle.
하상백(S. B. Ha),최성주(S. J. Choi),안대균(D. K. Ahn),김인수(I. S. Kim),최영휴(Y. H. Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
In recent years, the higher flatness level in wafer shape has been strictly demanded with a high integration of the semiconductor devices. It has become diffcult for a conventional wafer preparing process to satisfy those demands. In order to meet those demands, surface grinding with in-feed grinder is adopted. In an in-feed grinding method, a chuck table for fixing a semiconductor wafer rotates on its rotation axis with a slight tilt angle to the rotation axis of a cup shaped grinding wheel and the grinding wheel in rotation moves down to grind the wafer. So, stability of the grinder structure is very important to aquire a wafer of good quality. This paper describes the features of the in-feed grinder and some FEM analysis results of the grinder structure.
[論文] Acoustic Emission을 利用한 工具破損 및 Chipping의 探知에 關한 硏究
강명순(M. S. Kang),한응교(E. K. Han),김기중(K. C. Kim),최성주(S. J. Choi) 한국자동차공학회 1986 오토저널 Vol.8 No.3
This study was investigated the feasibility of AE application on in-process detection of tool fracture and chipping.<br/> Carbon steel SM45C workpiece with longitudinal slots was turned interruptedly on a lathe.<br/> AE RMS signal at tool fracture was observed and also the tangential force and the feed force were measured to compare with AE RMS signal. The sudden high level AE signal was observed at the time of tool fracture, the levels of tangential force and the feed force at the time of fracture decrease considerably.<br/> In chipping, high level AE signal was observed but there were no changes of cutting force.<br/> Peak AE RMS squared is proportional to the area of toolfracture and resultant force.<br/> Fracture model of tool fracture is proposed as<br/> v_P= C₁E₁F (△A)^0.5<br/> and peak AE RMS shows strong correlation with the fracture parameter F(△A)^0.5.