Simulation and Experimental Study of Magnetic Field-assisted Shear Thickening Fluid Polishing for Cemented Carbide Blades

doi:10.3969/j.issn.1004-132X.2023.06.003

Abstract

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

摘要： 为了提高硬质合金刀片磨削后的表面质量，提出了一种用于硬质合金刀片抛光的新方法——磁场辅助剪切增稠流体抛光。介绍了该抛光方法的基本原理，配制抛光液并进行流变特性的测试与分析，基于流变测试结果，获得了抛光液的优化配制方案。通过ANSYS FLUENT模块获得不同放置方式下工件表面的流场状态，分析在不同抛光速度与磁感应强度下工件表面的动压力与剪切应力分布情况，确定了工件的放置方式和加工参数。建立抛光实验平台，通过抛光实验探究了抛光速度、磁感应强度等工艺参数对表面粗糙度与材料去除率的影响规律。实验结果表明：刀片表面粗糙度Ra随着抛光速度的增大而降低，但磁感应强度对表面粗糙度影响不明显；工件表面抛光液的剪切应力和速度的乘积与材料去除率成正相关性。通过优化抛光工艺参数（工件竖直放置、抛光速度100 r/min、磁感应强度30 mT），可以获得刀片表面粗糙度Ra=15 nm的超精密加工表面，以及11.1 μm/h的高材料去除率。

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

CLC Number:

TG712

LI Hongyu, HUANG Xiangming, MING Yang, LI Xiyang, ZENG Qing, ZHOU Dongdong. Simulation and Experimental Study of Magnetic Field-assisted Shear Thickening Fluid Polishing for Cemented Carbide Blades[J]. China Mechanical Engineering, 2023, 34(06): 650-659.

李鸿宇, 黄向明, 明阳, 李希扬, 曾清, 周东栋. 磁场辅助剪切增稠流体抛光硬质合金刀片的仿真与实验研究[J]. 中国机械工程, 2023, 34(06): 650-659.

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