This study aims to address the issue of poor workpiece surface machining quality due to inadequate abrasive particle precipitation during the processing of magnetorheological polishing fluid. The paper employs magnetic dipole theory and molecular dynamics theory to establish a microdynamics model for magnetorheological polishing fluid and conducts kinematic and dynamic analyses of magnetic and abrasive particles. The chaining process of magnetic particles in magnetorheological polishing fluid was simulated under an external magnetic field, and the precipitation process of abrasive particles under the action of magnetic particles was simulated and analyzed. Furthermore, we established a microscopic observation experimental platform for magnetorheological polishing fluid and verified the precipitation law of abrasive particles under the action of dynamic magnetic field. The study findings indicate that the magnetic particles will form a chain structure, when the rotating magnetic field has an effect on the magnetorheological polishing fluid, and the abrasive particles will precipitate from the magnetorheological polishing fluid and adhere to the upper end of the magnetic chain. Moreover, the precipitation rate of abrasive particles is also affected by the magnetic field strength, the volume fraction of magnetic particles, and the rotating magnetic field speed, with the abrasive particles’ precipitation rate specifically increasing with higher magnetic field strength. At a magnetic field strength of 100 kA/m, the abrasive precipitation rate reaches 80 % in approximately 90 s, which increases to 80 % in only 60 s at a magnetic field strength of 200 kA/m. Additionally, with the increase of magnetic particle volume fraction, the precipitation rate of abrasive particles decreases. Within the first 40 s of the test, the magnetic particle volume fraction increases from 10 % to 30 %, and the precipitation rate of abrasive particles decreases by about 11 %. Similarly, the abrasive precipitation rate is affected differently by the rotating magnetic field speed. As the rotating magnetic field speed increases, the abrasive precipitation rate shows a trend of first increasing and then decreasing. When the rotating magnetic field speed increases from 20 r/min to 40 r/min, the abrasive precipitation rate of the first 40 s increases by about 25 %. When the speed continues to increase to 60 r/min, the precipitation rate of abrasive particles gradually decreases.

中文翻译：

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磁流变抛光液磨粒析出机理及实验验证

本研究旨在解决磁流变抛光液加工过程中磨粒沉淀不充分导致工件表面加工质量差的问题。本文运用磁偶极子理论和分子动力学理论建立了磁流变抛光液的微观动力学模型，并对磁性颗粒和磨料颗粒进行了运动学和动力学分析。模拟了外磁场作用下磁流变抛光液中磁性颗粒的链结过程，模拟分析了磨料颗粒在磁性颗粒作用下的沉淀过程。进一步建立了磁流变抛光液显微观察实验平台，验证了动态磁场作用下磨粒的析出规律。研究结果表明，当旋转磁场作用于磁流变抛光液时，磁性颗粒会形成链状结构，磨粒会从磁流变抛光液中沉淀出来，粘附在磁链的上端。此外，磨粒的沉淀速率还受到磁场强度、磁性颗粒的体积分数和旋转磁场速度的影响，随着磁场强度的增加，磨粒的沉淀速率特别增加。在磁场强度为100 kA/m时，磨料沉淀率在约90 s内达到80%，在磁场强度为200 kA/m时仅用60 s就增加到80%。另外，随着磁性颗粒体积分数的增加，磨粒的析出率降低。在测试的前40秒内，磁性颗粒体积分数从10%增加到30%，磨料颗粒的沉淀率降低约11%。同样，磨料沉淀速率受旋转磁场速度的影响也不同。随着旋转磁场速度的增大，磨料析出率呈现先增大后减小的趋势。当旋转磁场速度从20 r/min增加到40 r/min时，前40 s磨料沉淀率增加约25%。当转速继续增加到60 r/min时，磨粒的沉淀速率逐渐减小。