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입자연마가공에서의 입자크기 및 충돌각의 영향에 대한 고찰
곽하슬로미(Haslomi Kwak),김욱배(Wook-Bae Kim),성인하(In-Ha Sung) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.1
In this study, finite element analysis of particle-surface collision using 2-dimensional elements was performed to observe the effects of abrasive size and impact angle. The result of the simulation on the change in abrasive size revealed that larger abrasive particle induced larger contact stress due to force transfer through slurry fluid as the particle moved and pushed the fluid. This observation brought an important finding that the slurry fluid could make the workpiece surface soften and then change the mechanical properties of the surface layer such as elastic modulus and yield strength. As for the impact angle, it was found that the contact stress increased with the angle of impact and jumped up at a specific angle. Such result would be attributed to the complex effects of the impact velocity and angle.
김원우(Won-Woo Kim),김욱배(Wook-Bae Kim),최두선(Doo-Sun Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The MR fluid jet polishing system for the correction of surface profile and nano finish of ultraprecision parts is studied. When the stiffened MR fluid by external magnetic field is ejected from nozzle, very stable interface between jet and surrounding air with zero spray angle is shown. Due to such jet feature, constant and predictable material removal profile can be obtained. Experimentally, normal incidence of ceria-based MR fluid jet on glass produces very smooth and W-shaped removal profile which can be fitted by mathematical function which is used as tool function in deterministic polishing process.