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정우철(W. C. Jung),최진화(J. W. Choi),최길운(G. W. Choi),김성민(S. M. Kim),조명우(M. W. Cho) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Intervertebral cages in the cervical spine have been advantage in spinal fusion to relieve low back pain. In this study the effects of an intervertebral cage insertion on a cervical spine functional spinal unit investigate and cage structural analysis using finite element method. Three-Dimensional finite element models to create computed tomography (CT) scan C3-C4, obtain healthy young male which 1-mm slice section.
Micro End-milling과 MR fluid Jet Polishing을 이용한 도광판 마이크로채널 제작
이정원(J. W. Lee),하석재(S. J. Ha),홍광표(K. P. Hong),조용규(Y. K. Cho),조명우(M. W. Cho),제태진(T. J. Je) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
Micro parts can be shown its difference of performance according to the surface integrity of final products. Micro burrs which are taking place from micro cutting should remove for the improvement of surface integrity. To resolve this problem, studies for micro deburring have performed actively. Nickel and Brass are commercially used as the LGP (light guide plate) mold materials of three-dimensional optical device for mobile display due to its corrosion and chemical resistance. In this study, micro endmilling process was carried out to generate the burrs, and then the burr height was measured by using microscope. MR jet deburring process was performed onto the edges of nickel and brass by MR jet polishing method which can control the process from the viscosity control of cohesive MR fluid under the applied magnetic field. The jet angle (0°, 30°) and deburring time (1min, 3min, 5min) were chosen as process parameters. Burr height was investigated to draw a conclusion. It was obtained that the deburring result at 0° was better than that of 30°. Finally, all of burrs were eliminated at 0° after 5min.
MR Polishing과 EP 복합공정에 의한 SUS 304의 표면품위 거동에 관한 연구
하석재(S.J.Ha),이정원(J.W. Lee),홍광표(K.P. Hong),조용규(Y.K.Cho),김동우(D.W. Kim),조명우(M.W. Cho) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
Recently, the magnetorheological (MR) polishing process has been examined as a new ultra-precision polishing technology for mirror surface generation in many applications, such as aspheric lenses, biochips, micro parts, etc. The MR fluids, used for the polishing, consist of DI water based carbonyl iron (CI), nonmagnetic polishing micro abrasive, and required amount of stabilizers. In the process, mixed fluids were supplied into the gap between a rotating wheel (with electromagnetic field) and the workpiece. Then, the micro abrasives contained in the fluids perform material removal action from the workpiece. Such material removal mechanism in the MR polishing is considered as a process governed by the Bingham flow in the contact zone. In this study, generated surface integrities of SUS 304 using MR polishing process was investigated through a series of experiments. And electro-polishing(EP) process was adopted to reduce the micro-scratch after the MR polishing. The morphology of the generated surface is also observed by scanning electron microscope(SEM).
Xantan gum로 코팅된 CI-particle를 이용한 MR Polishing 특성에 관한 연구
이정원(J.W.Lee),하석재(S.J.Ha),신봉철(B.C.Shin),김동우(D.W.Kim),조명우(M.W.Cho),최형진(H.J.Choi) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
An finishing process using magnetorheological fluid (MR) fluid has been developed as a new precision finishing technique to obtain a fine metal surface. For MR polishing process, MR fluid was consists of CI particles, nonmagnetic polishing abrasives, water and stabilizers. One of the main ingredients in MR fluid is the magnetic CI particles. But carbonyl iron used in MR fluids a severe corrosion problem. Through coated on the CI particles had study the defect supplementation. It is understand the rheological behavior of the MR fluid based on the coated CI particles. Also the objectives of this research is to investigate the surface roughness obtained from the MR polishing process.