Abstract:  The key processing parameters of water jet guided laser cutting CFRP were studied by orthogonal test method， the effects of feed rate， water jet velocity， pulse frequency and laser power on cutting CFRP were obtained， and the optimal parameters obtained by direct comparison method and range analysis method were compared for single grooving cutting. The results show that when cutting CFRP under the optimal parameters obtained by range analysis method， the kerf depth increases by 3.2%， the kerf width decreases by 9.2%， the kerf taper decreases by 11.8%， and the line roughness decreases by 40.2%. Compared with the dry laser processing method， it is found that the water jet guided laser processing technology has obvious advantages in cutting CFRP. Due to the scouring and cooling effects of water jet， there is almost no heat affected zone and fiber pull-out on the cutting surfaces of the materials. In addition， the optimal processing parameters were obtained by orthogonal test， and the taper-free cutting of 4 mm thick CFRP was realized by using these parameters.

Key words:  , water jet guided laser processing, carbon fiber reinforced polymer（CFRP）, orthogonal test, cutting taper

摘要： 采用正交试验方法对影响水导激光切割碳纤维增强复合材料（CFRP）的关键工艺参数进行了深入研究，得出了进给速度、水射流速度、脉冲频率和激光功率对切割CFRP的影响规律，并用直接对比法和极差分析法所得最优参数进行单次划槽切割对比。研究结果表明：在极差分析法所得最优参数下切割CFRP时，切缝深度增大3.2%、切缝宽度减小9.2%、切缝锥度减小11.8%、线粗糙度减小40.2%。通过与干式激光加工方法对比发现，水导激光加工技术在切割CFRP方面优势明显，由于水射流的冲刷和冷却作用，材料切割表面几乎无热影响区和纤维拔出。另外，采用正交试验所得最优工艺参数实现了4 mm厚度CFRP的无锥度切割。

关键词: 水导激光加工, 碳纤维增强复合材料, 正交试验, 切割锥度