关键词: 硬质合金刀片, 磁场辅助剪切增稠抛光, 流变特性, 表面质量, 材料去除率

Abstract: In order to improve the surface quality of ground cemented carbide blades， a new method for polishing cemented carbide blades， magnetic field-assisted shear thickening fluid polishing， was proposed. The basic principles of the polishing method were introduced， the polishing liquid was prepared， and the rheological properties were tested and analyzed. Based on the rheological test results， the optimal preparation scheme of the polishing liquid was obtained. The flow field state of the workpiece surface under different placement methods was obtained by the ANSYS FLUENT module， and the distribution of dynamic pressure and shear stress on the workpiece surfaces was analyzed under different polishing speeds and magnetic induction strengths， and the placement mode and processing parameters of the workpiece were determined. A polishing experimental platform was established， and the effects of polishing speed， magnetic induction intensity and other processing parameters on the surface roughness and material removal rate were explored. The experimental results show that the surface roughness Ra decreases with the increasing polishing speed， but it is not significantly affected by the magnetic induction intensity. And the product of the shear stress and velocity of the polishing liquid on the workpiece surfaces has a positive correlation with the material removal rate. By optimizing the polishing processing parameters（The workpiece is placed vertically， the polishing speed is as 100 r/min， and the magnetic induction intensity is as 30 mT）， the ultra-precision machined surfaces with surface roughness Ra=15 nm and the high material removal rate（11.1 μm/h） may be obtained. 

Key words: cemented carbide blade, magnetic field-assisted shear thickening polishing, rheological property, surface quality, material removal rate