Drilling of fibrous composites like carbon fiber reinforced plastics (CFRPs) is always considered a grim job to perform owing to its abrasiveness and inhomogeneous properties. Compared to the available studies, the present work addresses the parametric investigation on drilling capability of TiAlN- and TiN-coated drills over the uncoated one. The delamination factor, surface roughness, and circularity error in CFRP were considered as the quality features. The acquired thrust and torque were analyzed in the time domain as well as the time–frequency wavelet field, followed by a sensitivity analysis between decomposed original force–torque signals in different phases. Finally, an attempt was made to improve the predictability of drilled hole quality using decomposed wavelets of force and torque extended to hybrid force–torque wavelets of the best features to the developed regression models. The feed rate was more predominant than spindle speed on delamination evidenced by higher axial thrust particularly using coated tools. However, the coated drills generated more uniform torque than the uncoated drills and improved the drilled hole quality as well. The torque wavelet was a better indicator of hole surface integrity than force wavelets in which intermediate frequency band torque and low-/high-frequency band force wavelets were found to be more significant.

碳纤维增强塑料（CFRPs）等纤维复合材料的钻孔由于其磨蚀性和不均一性而一直被认为是一项艰巨的任务。与现有研究相比，本工作着重于对TiAlN涂层和TiN涂层钻头在未涂层钻头上的钻孔能力进行参数研究。CFRP中的分层因子，表面粗糙度和圆度误差被视为质量特征。在时域以及时频小波场中分析了获得的推力和扭矩，然后对分解后的原始力-扭矩信号在不同相位之间进行了灵敏度分析。最后，试图通过将分解后的力和转矩小波扩展到已开发的回归模型中具有最佳特征的混合力-转矩小波来提高钻孔质量的可预测性。进给速度比分层时的主轴速度更重要，这是由较高的轴向推力（特别是使用涂层工具）所证明的。但是，带涂层的钻头比未带涂层的钻头产生更均匀的扭矩，并且也改善了钻孔质量。扭矩小波比力小波更好地指示了孔表面的完整性，在力小波中，中频带扭矩和低/高频带力小波更为重要。较高的轴向推力可以证明，进给速率比分层时的主轴转速更重要，尤其是使用涂层刀具时。但是，带涂层的钻头比未带涂层的钻头产生更均匀的扭矩，并且也改善了钻孔质量。扭矩小波比力小波更好地指示了孔表面的完整性，在力小波中，中频带扭矩和低/高频带力小波更为重要。较高的轴向推力可以证明，进给速率比分层时的主轴转速更重要，尤其是使用涂层刀具时。但是，带涂层的钻头比未带涂层的钻头产生更均匀的扭矩，并且也改善了钻孔质量。扭矩小波比力小波更好地指示了孔表面的完整性，在力小波中，中频带扭矩和低/高频带力小波更为重要。