http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
안병운(Byoung Woon Ahn),이광호(Kwang Ho Lee),이성환(Seoung Hwan Lee) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Recently, AFM with suitable tips is being used for nano fabrication/nano machining purposes. In this paper Acoustic emission(AE) was introduced to monitor the nano machining of brittle materials (silicons) using AFM. In the experiments, AE responses were sampled, as the tip load was linearly increased (ramped load), to investigate the machining characteristics. By analysing the experimental results, it can be concluded that measured AE energy is sensitive to changes in the mechanism of material removal including the ductile-brittle transition during the nano machining. The critical depth of cut value for the transition is evaluated and discussed.
김설빔(Seol Bim Kim),안병운(Byoung Woon Ahn),이성환(Seoung Hwan Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.5
In configuring an automated polishing system, a monitoring scheme to estimate the surface roughness is necessary. In this study, a precision polishing process, magnetic abrasive finishing (MAF), along with an inprocess monitoring setup was investigated. A magnetic tooling is connected to a CNC machining to polish the surface of stavax(S136) die steel workpieces. During finishing experiments, both AE signals and force signals were sampled and analysed. The finishing results show that MAF has nano scale finishing capability (upto 8㎚ in surface roughenss) and the sensor signals have strong correlations with the parameters such as gap between the tool and workpiece , feed rate and abrasive size. In addition, the signals were utilized as the input parameters of artificial neural networks to predict generated surface roughness. Among the three netwoks constructed -AE rms input, force input, AE+force input- the ANN with sensor fusion (AE+force) produced most stable results. From above, it has been shown that the proposed sensor fusion scheme is appropriate for the monitoring and prediction of the nano scale precision finishing process