飞秒激光加工镍基合金无锥度微群孔试验研究

As the service temperature of turbine blades and other hot-end components in aero-engines is increasing, nickel-based alloys, which represent high-temperature resistant materials, are gradually being used for their manufacturing. At the same time, in order to further improve the service performance of these components, it is necessary to process film cooling holes on their surfaces. Due to its precision, low damage, and cold processing characteristics, femtosecond ultrafast laser is increasingly suitable for the processing of nickel-based micro-group holes. However, due to the large number of gas film holes, dense distribution, and high positioning accuracy, the inclined workpiece drilling process is difficult to meet the processing requirements of non-taper micro-group holes. In addition, the inclined laser drilling process has high requirements for the calculation and motion control precision of the optical path mathematical model. Therefore, in order to achieve the processing of non-taper micro-group holes in nickel-based alloy, a method of achieving non-taper group holes processing through multi-axis linkage of the machine tool is proposed. Firstly, the influence of machine tool motion parameters are explored, such as the feed speed and feed radius of the machine tool on the micro-group holes morphology. Then, the experimental study on the effective processing range of femtosecond laser processing of micro-group holes is carried out. Finally, based on the parameter exploration of the non-taper single hole experiment, the group hole processing experiment is carried out on a flat sample, and the experimental results are discussed and analyzed to form a complete flat group hole processing process. Ultimately, the 5×5 micro-group holes with an average taper of −0.03 ° was obtained on a nickel-based alloy with a thickness of 1 mm.