Simulation and analysis of abrasive particles dynamics behavior during magnetic particles grinding on inner wall of pipe fitting
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摘要: 为探究磁性磨粒在管件研磨过程中的动力学行为,对其研磨过程进行离散元仿真,并分析其运动轨迹和磨削力随管件转速和加工间隙的变化;通过单磨粒球运动及磁粒研磨试验,验证磁场力模型的准确性与粒子运动学行为可视化的可行性。结果表明:随管件转速提高,磁性磨粒在离心力作用下向加工区域外运动,且加工间隙越大越容易被“甩飞”;在达到临界转速之前,随管件转速提高,磨削力减小,材料去除效率提升。当管件转速由400 r/min提高至临界转速,加工间隙为2 mm和4 mm时,磨削力分别下降5.4 μN和2.3 μN,材料去除效率明显提升;当加工间隙为6 mm时,磨削力变化较小,且当转速大于临界转速650 r/min时,材料去除效率下降。同时,材料去除量在达到临界转速之前随管件转速提高而增大,但加工间隙的增大会使临界转速降低;且材料去除量的变化趋势与仿真结果一致,验证了仿真分析的可靠性。Abstract: To explore the dynamic behavior of magnetic abrasive particles in the grinding process of pipe fittings, the grinding process of magnetic abrasive particles was simulated using discrete elements. The changes in motion trajectory and grinding force with the speed of pipe fittings and the processing gap were analyzed. Single abrasive particle ball motion and magnetic particle grinding test were conducted to verify the accuracy of the magnetic field force model and the feasibility of visualizing the particle kinematic behavior. The results show that as the speed of the pipe fittings increases, the magnetic abrasive particles move outside the processing area due to centrifugal force, and the larger the processing gap, the easier they are "thrown away". Before reaching the critical rotation speed, the grinding force decreases, and material removal efficiency increases with the increase in pipe rotation speed. When the pipe rotation speed increases from 400 r/min to the critical rotation speed and the machining gaps are 2 mm and 4 mm, the grinding forces decrease by 5.4 μN and 2.3 μN respectively, leading to a significant improvement in material removal efficiency. However, with a machining gap of 6 mm, the grinding force changes little, and when the rotation speed exceeds the critical rotation speed of 650 r/min, material removal efficiency decreases. Additionally, the material removal amount increases with the increase in pipe rotation speed before reaching the critical rotation speed, but increasing the processing gap reduces the critical rotation speed. The change in material removal amount aligns with the simulation results, validating the reliability of the simulation analysis.
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表 1 材料参数
Table 1. Material parameters
类型 密度 ρ /(kg·m−3) 弹性模量 E / Pa 泊松比 ν 管件 4 510 4.48 × 1010 0.38 磨粒 5 548 6.09 × 109 0.29 表 2 接触参数
Table 2. Contact parameter
类型 碰撞恢复系数 e 静摩擦系数 μs 滚动摩擦系数 μr 磨粒与磨粒 0.20 0.50 0.01 磨粒与管件 0.15 0.50 0.01 -
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