Micro-holes drilling of titanium alloy using ultrasonic-assisted high-speed drilling (UAHD) has been proven to be effective in improving the height of the exit burr. The height of the exit burr is considered as one of the key output variables to evaluate the machining quality of micro-holes. Investigating the height of the exit burr and its modeling development provides great help to understand the effects of processing parameters on the burr height. This investigation will present an analytical model for the height of micro-holes exit burr. The acoustic softening effect is considered in this model. The approaches of the modeling development start from the work done by each part, including the axial force work, material deformation work, and total work. Then the burr height is calculated according to the conservation of energy. To verify the model, a single factor experiment of titanium alloy micro-holes was designed. The trends of analytical burr heights were consistent well with those of experimental results. Both the analytical model and the experimental results showed that the height of the exit burr was negatively correlated with the ultrasonic amplitude and spindle speed, and positively correlated with the feed speed. Also, the micro-holes exit morphology was observed under different processing parameters. The results showed that larger amplitude, spindle speed, and smaller feed speed were beneficial to the micro-holes exit with higher shape accuracy.

使用超声波辅助高速钻孔 (UAHD) 在钛合金上钻微孔已被证明可有效提高出口毛刺的高度。出口毛刺的高度被认为是评价微孔加工质量的关键输出变量之一。研究出口毛刺的高度及其建模开发为了解加工参数对毛刺高度的影响提供了很大帮助。这项调查将提出一个微孔出口毛刺高度的分析模型。该模型考虑了声学软化效应。建模开发的方法从各部分所做的功开始，包括轴力功、材料变形功和总功。然后根据能量守恒计算毛刺高度。为了验证模型，设计了钛合金微孔的单因素实验。分析毛刺高度的趋势与实验结果一致。分析模型和实验结果均表明，出口毛刺高度与超声波振幅和主轴转速呈负相关，与进给速度呈正相关。此外，在不同的加工参数下观察到微孔出口形态。结果表明，较大的振幅、主轴转速和较小的进给速度有利于以较高的形状精度退出微孔。分析模型和实验结果均表明，出口毛刺高度与超声波振幅和主轴转速呈负相关，与进给速度呈正相关。此外，在不同的加工参数下观察到微孔出口形态。结果表明，较大的振幅、主轴转速和较小的进给速度有利于以较高的形状精度退出微孔。分析模型和实验结果均表明，出口毛刺高度与超声波振幅和主轴转速呈负相关，与进给速度呈正相关。此外，在不同的加工参数下观察到微孔出口形态。结果表明，较大的振幅、主轴转速和较小的进给速度有利于以较高的形状精度退出微孔。