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MR fluid Jet Polishing 시스템을 이용한 금형코어재료 연마특성에 관한 연구
이정원(J. W. Lee),하석재(S. J. Ha),홍광표(K. P. Hong),조용규(Y. G. Cho),여인규(I. G. Yeo),조명우(M. W. Cho),제태진(T. J. Je) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
Ultra-precision polishing method by using MR fluid was come into the spotlight for the polishing of metal and optical materials. MR jet polishing process can be controlled by changing the viscosity of MR fluid according to imposed magnetic field. The used MR fluid for MR jet polishing process is composed with the mixture of CI particles, DI water, Na₂CO₃, and glycerin. The results can be obtained from the polishing parameters, such as polishing time, magnetic field, stand-off distance, pressure, etc. In this paper, MR jet polishing was applied to polish the nickel and brass surface with the corrosion and chemical resistance. Nickel and Brass mold materials have been used to fabricate the BLU (back light unit) for three-dimensional optical device in mobile display industries. The polishing results were investigated with the polishing time changing. In case of the MR jet polishing, ferromagnetic materials can be able to interrupt due to the cohesive MR fluid more than non-ferromagnetic materials during MR jet polishing. As the results, the surface roughness of brass (Ra=1.82㎚) was better than the one of nickel (Ra=2.24㎚) after 20min.