结合激光加热辅助切削和超声振动切削提出了激光超声复合切削加工工艺。采用PCBN刀具对YG10硬质合金进行普通切削、超声振动切削、激光加热辅助切削和激光超声复合切削对比试验,采用超景深显微镜观测刀具磨损量及磨损形貌,通过扫描电子显微镜(SEM)对刀具磨损区域进行能谱分析,研究激光超声复合切削条件下刀具的磨损规律、磨损形态及磨损原因。研究结果表明:与普通切削、超声振动切削及激光加热辅助切削相比,激光超声复合切削时刀具后刀面磨损量平均值分别降低57.5%、46%、41.3%,刀具使用寿命明显提高;刀具磨损形态主要表现为前刀面磨损、后刀面磨损和崩刃;激光超声复合切削硬质合金时粘接磨损、氧化磨损、相变磨损和微裂解磨损是引起PCBN刀具磨损的主要原因。 Combined with laser heating assisted cutting and ultrasonic vibration cutting laser ultrasonic composite cutting process. Using PCBN tool, YG10 cemented carbide was cut by ordinary cutting, ultrasonic vibration cutting, laser heating auxiliary cutting and laser ultrasonic cutting. The tool wear and wear morphology were observed by using the depth of field microscope. The scanning electron microscopy (SEM) The wear area was analyzed by energy spectrum to study the wear law, wear shape and wear reason of the cutter under laser ultrasonic compound cutting condition. The results show that the average flank wear loss of laser cutting is 57.5%, 46% and 41.3% lower than that of common cutting, ultrasonic vibration cutting and laser heating auxiliary cutting, respectively. The service life of cutting tools is obviously increased. The wear patterns mainly include rake face wear, flank wear and chipping. Adhesive wear, oxidation wear, phase change wear and micro-cracking wear are the main causes of PCBN tool wear when laser ultrasonic cutting cemented carbide.