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Wavelet 변환에 의한 숫돌로딩 진단과 노이즈 제거
양재용,하만경,곽재섭,박후명,이상진,Yang, J.Y.,Ha, M.K.,Kwak, J.S.,Park, H.M.,Lee, S.J. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the diagnosis of grinding conditions in grinding process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. STD11 workpiece was 85 times of machined pieces cut by the WA wheel and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms. At dressing time, the approximation signals were slowly increased and 45 machined times noticed dressing time.
양재용(J. Y. Yang),윤문철(M. C. Yoon) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
The machined surface geometry of the workpiece after machining has been configured by using Confocal Laser Scanning Microscopy (CLSM) and the Wavelet-based filtering technique. The CLSM can be well suited to construct the three-dimensional machined surface of the workpiece. However, The raw heightness data of HEI(height encoded image) acquired by CLSM must be filtered due to the electronic and imaging noise occurring in constructing the surface image. So the Wavelet-based filtering algorithm is necessary to denoise the shape features in a micro scales so as to realize accurate topography analysis. The surface patterns filtered enable us to predict the machined surface shape in order to study the surface characteristics considering the tilting that is incurred in mounting. This study shows that the new technique by combining the CLSM and Wavelet-based filtering is an excellent one to generate the geometries of micro machined surfaces over a wide range of surface resolution in a micro scale.
CBN 과 WA숫돌에 의한 연삭에서 연산력과 표면거칠기 특성
하만경,곽재섭,양재용,정영득,심성보,류인일 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
In this study an experimental investigation was conducted to find the grinding characteristics of ceramics, STD11 and STS304 materials. The grinding force and the microscopic observation of the workpieces were obtained in surface grinding. Grinding characteristics of ceramics were inspected through the microscopic examination, the cutting force, and the surface roughness. It has been found that the grinding force of ceramics is relatively low as compared to that of steels and that CBN wheel has an excellent performance. The surface roughness was measured according to the feedrate and the depth of cut.