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문홍현,김성청,공재향,박병규,소의열,이근상 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
In this study, through the experimental results of grinding ratio, grinding force and surface roughness with the obtained wear amount of diamond wheel and ceramic material during the grinding process, the following conclusions could be found. In the case of Si₃N₄, the wear of diamond wheel is large while the grinding force is stable and the range of change in surface roughness is small. For the case of Al₂O₃ and ZrO₂, while the wear of diamond wheel is getting smaller, the grinding force is increasing but the value of surface roughness is decreasing. For grinding with the vitrified bond wheel, it seems that the self-sharpening can be found for Si₃N₄ and the glazing effect of the cutting edge for Al₂O₃ and ZrO₂.
초음파 폴리싱 가공에 따른 세라믹재료의 표면거칠기에 관한 연구
문홍현,박병규,이찬호,김성청,Moon, Hong-Hyun,Park, Byung-Gyu,Lee, Chan-Ho,KIm, Sung-Chung 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.1
The ultrasonic polishing machine was developed to get super finishing that consist of machine part that can rotate and travel the main shaft with power 1.5kW, ultrasonic generator with frequency 20kHz. By using this machine we were investigated the characteristics of ultrasonic polishing for three different ceramics, and so could be obtained following results. First, we could be obtained the excellent surface for hard-ta-difficult cutting materials. Second, the effect of surface roughness for the feed rate could be shown that the more the feed rate Increases, the more the value of surface roughness increases. Third, owing to the characteristics being progressed brittle fracture in $Al_2O_3$ polishing with this machine, the value of surface roughness is larger than other ceramics. Forth, because the ultrasonic polishing can be smoother than the existing grinding in discharging the chips, it could be possible to improve the surface roughness about up to 15%.
문홍현,박병규,김성청 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.2
The characteristics of grinding and wear behavior of diamond wheel for grinding ceramic materials was investigated in this study. In case of Si_3N_4, the wear of wheel was large but the range of surface roughness was small. On the other hand in case of Al_2O_3 and ZrO_2, the wear of wheel was increasing but surface roughness was decreasing. During grinding with vitrified bond wheel, Si_3B_4 shows renewal of cutting edge while Al_2O_3 and ZrO_2 show blade glazing phenomenon. Through the experiments, this makes it possible to observe grinding wheel behavior by grinding ratio, grinding resistance, surface roughness and cutting edge ratio. In case of vitrified bond wheel which grain size 400, wheel life was at 20 times in Si_3N_4 and 40 times in Al_2O_3 and ZrO_2.
문홍현(H. H. Moon),박병규(B. G. Park),김성청(C. H. Lee),이찬호(S. C. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
We have developed the ultrasonic polishing system to get super finishing that consist of<br/> machine part that can rotate and travel the main shaft with power 1.5kW, ultrasonic generator with<br/> frequency 20kHz. By using this system we were investigated the characteristics of ultrasonic<br/> polishing and deduced the major facters which affect the surface roughness by the experimental<br/> plans for three different materials such as ceramic, glass, and wafer, and so could be obtained<br/> following results. We could be obtained the excellent surface for hard-to-difficult cutting<br/> materials. The rotating speed could be found to be major factor influencing the surface roughness.<br/> In the case of ceramic and wafer, we were able to obtain good surface roughness when the feed<br/> rate and ultrasonic output is higher. In the case of glass, the surface roughness becames worse<br/> when ultrasonic output is higher because of increasing of load affacting on the particles in slurry.
세라믹 연삭에서 다이아몬드 휠의 연삭 특성 및 마멸 거동
박병규,문홍현,김성청 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.5
The characteristics of grinding and wear behavior of diamond wheel for grinding ceramic materials was investigated in this study. In case of Si₃N₄, the wear of wheel was large, the grinding force was relatively stable and the fluctuation of surface roughness was small. On the other hand in case of Al₂O₃ and ZrO₂, the wear of wheel and surface roughness were decreasing the grinding force was increasing. During grinding with vitrified bond wheel, Si₃N₄ shows renewal of cutting edge while Al₂O₃ and ZrO₂ show glazing phenomenon of cutting gram. We have found that it possible to observe the behavior of grinding wheel by grinding ratio, grinding resistance, surface roughness and cutting edge ratio. Through the grinding experiments, it was found that grinding life of diamond wheel is 20 times for Si₃N₄ and 40 times for Al₂O₃ and ZrO₂.
혼 해석을 통한 초음파 폴리싱 시스템의 개발 및 연마특성
박병규,김성청,문홍현,이찬호,강연식 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.3
We have developed and manufactured an experimental ultrasonic polishing machine with frequency of 20kHz at the power of vibration 1.7kw for effective ultrasonic polishing in processing of high hardness material. Design of the horn is performed by the FEM analysis. The following, conclusions were empirically deduced through experimental results to the major elements which affect the surface roughness during the ultrasonic process by following the experimental plans. The ultrasonic polishing machine has been developed in parts of structure part, ultrasonic generator, vibrator. We were able to process the high hardness material without difficulty as a result of ultrasonic polishing by utilizing the groove added step-type horn. Through analyzing by applying the experimental plans, the rotating speed of the horn was determined to be the major factor in influencing the surface roughness. In the case of ceramic, wafer, we were able to obtain good surface roughness when the feed rate and the ultrasonic output were higher. Because the load on slurry particle increases when the ultrasonic output is higher, the processed becomes worse in the case of optical glass.