Material removal of glass by magnetorheological fluid jet

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• 作者：Wook-Bae Kim (1)
  Eunseok Nam (2)
  Byung-Kwon Min (2)
  Doo-Sun Choi (3)
  Tae-Jin Je (3)
  Eun-Chae Jeon (3)
  
  1. Department of Mechanical Design Engineering ; Korea Polytechnic University ; 237 ; Sangidaehak-ro ; Siheung-si ; Gyeonggi-do ; 429-793 ; South Korea
  2. School of Mechanical Engineering ; Yonsei University ; 50 ; Yonsei-ro ; Seodaemun-gu ; Seoul ; 120-749 ; South Korea
  3. Nano-Convergence Mechanical Systems Research Division ; Korea Institute of Machinery and Materials (KIMM) ; Daejeon ; 305-343 ; South Korea
  
• 关键词：Glass ; Granular flow ; Magnetorheological fluid jet ; Polishing ; Surface finishing ; Surface roughness
• 刊名：International Journal of Precision Engineering and Manufacturing
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：16
• 期：4
• 页码：629-637
• 全文大小：1,754 KB
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• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Materials Science
  
• 出版者：Korean Society for Precision Engineering, in co-publication with Springer Verlag GmbH
• ISSN：2005-4602

文摘

Magnetorheological (MR) fluid jet polishing is a material removal process for precision products such as optical elements. It is characterized by a jet flow that is stabilized by a magnetic field, and a highly predictable machining spot. The behavior of the particles in an MR fluid slurry near a target wall surface is conceptually described. In experiments with a BK7 glass specimen, various removal spots are created by impingement of MR fluid jets at velocities of 10~30 m/s, using MR fluids of different compositions, and different processing durations. The tangential MR fluid flow along the part surface is assumed to be responsible for material removal, and theoretical models for the prediction of material removal are developed, using the conventional wear model and granular flow theory. The constitutive relation between the shear stress and the shear rate changes as the jet velocity increases, which has a critical effect on the behavior of material removal. CFD analysis is performed to calculate the wall shear rate. The proposed models agree with the experimental results with respect to the distribution of the material removal rate. Additionally, the surface topographies of polished parts are discussed, with regards to the particle behavior.