目的 探索枪钻钻削Ti6Al4V钛合金刀具的磨损特性，探讨刀具磨损对钻削轴向力的影响。方法 设计深孔钻削试验，每孔钻深575 mm，每钻削一个孔，使用共聚焦显微镜对刀具磨损特性及磨损值进行分析，并使用测力仪对轴向力信号进行提取。通过显微镜观测，对刀具的磨损形式进行分析，结合刀具实际磨损情况，给出刀具的磨损等级。通过对轴向力的分析，研究刀具磨损量对于钻削轴向力的影响。结果 由刀具磨损曲线可知，在整个钻削试验过程中，磨损过程可分为三个阶段：初期磨损、正常磨损、剧烈磨损。外刃第一后刀面的平均磨损量及最大磨损量在磨损的三个阶段中始终大于前刀面。当钻削深度达到11 m以后，刀具整体磨损速率上升，进入剧烈磨损阶段；当钻削深度达到14 m以后，外刃第一后刀面最大磨损量急剧增加。轴向力变化曲线呈现初期磨损阶段基本保持不变，正常磨损阶段平稳增加，剧烈磨损阶段趋于稳定的变化趋势。结论 刀具的主要磨损形式为前刀面和外刃第一后刀面的表面烧灼及粘结磨损，外刃和侧刃的破损及崩刃，导向面的大面积剥落继而形成凹坑，三种情况共同导致刀具失效。刀具剧烈磨损阶段，刀具磨损速率迅速增加，切削力较大，因此实际加工过程中应在剧烈磨损阶段之前对刀具进行重磨。

The work aims to investigate the wear properties of Ti6Al4V titanium alloy tool in gun drilling and discuss the effect of tool wear on drilling axial force. Deep hole drilling test was designed and each holes was drilled to 575 mm. After drilling a hole, the tool was analyzed for wear properties and wear values by focus microscope and the dynamometer was used to extract the axial force signal. The tool wear form was analyzed through observation by microscope and the tool wear grade was given according to actual wear of tool. Based on the analysis of the axial force, the influence of tool wear on the axial force of drilling was studied. From the tool wear curve, the wear process could be divided into three stages during the whole drilling test: initial wear, normal wear and severe wear. The average wear amount and the maximum wear amount of the first flank face on the outer blade were always greater than that of the rake face in the three stages. When the drilling depth reached 11 m, the overall wear rate of the tool increased, and the tool entered the severe wear stage. When the drilling depth reached 14 m, the maximum wear of the first flank on the outer edge increased rapidly. In addition, the axial force curve showed that the initial wear stage remained unchanged, the normal wear stage increased steadily and the severe wear stage tended to be stable. The main wear forms of tool are burning wear and adhesive wear on the rake face and the first flank of the outer blade, breakage and tripping on outer edge and side edge, peeling of large area on guide surface. Thus, pits are formed. These three cases can cause the failure of tool. In the severe wear stage, the tool wear rate increases rapidly and the cutting force is large. Therefore, the tool should be re-ground before the severe wear stage during actual process.