为研究 BK7 玻璃孔加工过程中入口破损的形成机理，在对破损形貌进行显微观 测的基础上，分析了单个磨粒的动力学特性及刀具端面上磨粒的分布特征，对单个破损的 深度和宽度进行了测量与分析，并借助于压痕断裂力学理论研究了边缘破损及破损表面 散射状条纹的形成机理． 结果表明: 刀具端面上不同磨粒距离边沿的距离不同，其联合刻 划作用导致侧向裂纹扩展至孔径之外，使得孔入口破损呈现出参差不齐分布特征; 在侧向 裂纹形成过程中，材料受力状态的改变导致破损表面出现了大量散射状条纹; 利用压痕断 裂力学理论建立的入口破损深度与宽度之间的理论关系模型的正确性经实验得以验证， 破损深度随其宽度呈非线性单调递增

: To investigate the entrance damaged formation mechanism in the process of drilling of BK7 glass，the dynamic characteristics of single abrasive and the distribution characteristics of abrasives on the tool end-face were analyzed． The morphological characteristics of the chipping and the formation mechanisms of the scattered surface stripes were explored，and the depths/widths of the chippings were measured． The results showed that the joint scratches of different abrasives on the end face of cutting tools caused the lateral cracking extending beyond the boundary of the hole，leading to the uneven distribution at the entrance of hole． In the formation process of the lateral cracks，the variation of the force state of the material resulted in the formation of the scattered stripes on the chipping surface． The correctness of the relationship between damaged depth and width was verified by experiments，and the nonlinear damaged depth increased with its width monotonically．