Blade root with a special fir-tree shape is a critical connection part in an aero-engine. This part has high requirements on the surface finish and geometrical accuracy. At present, the tangential ultrasonic vibration-assisted profile grinding (UVAPG) is an effective method for machining the blade roots. During UVAPG, the wheel wear degrades the surface finish and geometrical accuracy. However, the characteristics of the wheel wear in UVAPG are not fully revealed. This study proposes an analytical wear model by considering the intermittent grinding behavior of a grinding edge, the number of active grinding edges, and the effects of wheel profile on the tool wear. The model is experimentally demonstrated to be applicable to predicting the wear volume in UVAPG with a maximum error of 4.2 %. Based on the model, the tangential ultrasonic vibration increases the average unchanged chip thickness and the number of active grinding edges. UVAPG causes an approximately 22 % increase in wear volume at the steady wear stage compared with the conventional grinding. The wear speeds vary at different regions of a profile wheel. The convex regions represent higher wear speeds than the concave regions on the wheel.

具有特殊枞树形状的叶根是航空发动机中的关键连接部件。这部分对表面光洁度和几何精度有很高的要求。目前，切向超声振动辅助仿形磨削（UVAPG）是一种有效的叶片根部加工方法。在 UVAPG 期间，车轮磨损会降低表面光洁度和几何精度。然而，UVAPG 中车轮磨损的特征并未完全揭示。本研究通过考虑磨削刃的间歇磨削行为、有效磨削刃的数量以及砂轮轮廓对刀具磨损的影响，提出了一种磨损分析模型。实验证明该模型适用于预测 UVAPG 中的磨损量，最大误差为 4.2%。基于模型，切向超声振动增加了平均不变的切屑厚度和有效磨削边缘的数量。与传统磨削相比，UVAPG 在稳定磨损阶段使磨损量增加约 22%。异形轮的不同区域的磨损速度不同。凸面区域比车轮上的凹面区域代表更高的磨损速度。