半固着磨粒加工工艺参数对“陷阱”效应影响的离散元模拟

The distinct element simulation of semifixed abrasive processing parameters influencing 'trap' effect

半固着磨粒加工以"陷阱"效应来降低加工质量和效率对磨粒尺寸分布均匀程度的敏感性,可提高精密、超精密加工的生产效率。对半固着磨具的"陷阱"效应进行离散元模拟,选取多种不同粒径大颗粒,分析加工载荷、工件与磨具的相对速度,以及工件摩擦因数三个加工工艺参数对"陷阱"效应的影响。仿真结果表明:加工载荷越大,半固着磨具"陷阱"效应发挥越好;而工件与磨具的相对速度和工件摩擦因数对半固着磨具"陷阱"效应影响不大;大颗粒尺寸越接近磨具中磨粒的尺寸,半固着磨具的"陷阱"效应发挥越好。

The sensitivity of machining accuracy and efficiency to abrasive size distribution uniformity is decreased by the ＇ trap＇ effect of semi-fixed abrasive machining. The productivity of the precision and ultra-precision processing is improved by the ＇ trap＇ effect. ＇ Trap＇ effect of semi-fixed abrasive grinding plate is simulated by discrete element method. The different dimension lager particles are selected to analyze the impacts of the three processing parameters （processing load, the relative velocity between the workpieces and the plate,the friction coefficient of the workpieces） on the ＇trap＇ effect. The simulation results show as follow： with the increase of processing load, the ＇ trap＇ effect of semi-fixed abrasive grinding plate will performs better. The friction coefficients of the workpieces and the relative velocity between the workpieces and the plate have no impact on the ＇ trap＇ effect. When the large particles size is much closer to the abrasive size, the ＇ trap＇ effect performs better.