根据接触力学原理建立了固结磨料研磨的平均切深模型,估算了不同粒径磨料作用下平均切深。依据磨粒平均切深值,采用离散元法对镁铝尖晶石固结磨料研抛的过程进行了模拟,并以此预测了固结磨料研磨条件下工件的亚表面损伤深度。采用角度抛光方法对亚表面损伤层深度的预测值进行了验证。结果表明:W5FAP研磨下工件亚表面损伤层深度的预测值为1.32μm、实测值为1.37μm;W14FAP研磨下的预测值为3.93 m,实测值为4.56μm;W50FAP研磨下的预测值为9.07μm,实测值为9.12μm;离散法的亚表面损伤层的预测结果与实测结果基本一致,验证了该方法的可靠性。 According to the principle of contact mechanics, the average depth of cut of the consolidated abrasive was established, and the average depth of cut of the abrasive with different particle sizes was estimated. Based on the average depth of cut, the discrete element method was used to simulate the grinding and polishing process of the spinel, and the sub-surface damage depth of the workpiece under the condition of fixed abrasive grinding was predicted. The method of angle polishing was used to verify the predicted depth of sub-surface damage layer. The results show that the prediction value of sub-surface damage depth of W5FAP is 1.32μm, the measured value is 1.37μm, the predicted value of W14FAP is 3.93 m, the measured value is 4.56μm, and the predicted value of W50FAP is 9.07μm , The measured value is 9.12μm. The prediction results of subsurface damage by discrete method are basically consistent with the measured results, which verifies the reliability of the method.