点接触共轭曲面齿轮的飞秒激光精微修正齿面形性控制机制与方法研究

针对机械加工点接触共轭曲面齿轮的精度和表面质量欠佳的问题，利用飞秒激光具有加工区域精确和峰值功率高等优势，开展飞秒激光精微修正点接触共轭曲面齿轮齿面形性控制机制与方法研究，以获得高的齿面加工质量。围绕飞秒激光修正加工条件下产生的非傅里叶能量吸收现象和物理作用动态效应，包括多脉冲能量串行耦合、变厚度变焦、材料动态吸收、等离子体冲击波、材料成分间互温感应等时间/空间上多尺度作用影响的科学问题，创建三温复耦合理论模型，研究激光工艺参数对物理作用过程中热传递、齿面温度、烧蚀参数和齿面形性的影响规律；进行修正工艺规划，研究齿面形貌控制综合模型、多物理场耦合的流变应力变化机理、多目标工艺优化方法，揭示激光和修正工艺参数影响齿面形貌与性态的控制机制。取得飞秒激光精微修正理论创新与关键工艺技术方法突破，促进点接触共轭曲面齿轮传动在交通运输、大型装备、航空航天、工程机械等领域的广泛工程应用。

For the problems of poor machining precision and surface quality of point contact conjugate surface gear, the advantages of accurate processing area and high peak power of femtosecond laser are used, and the micro-precision correction method and control mechanism of tooth surface morphology and behavior of point contact conjugate surface gear processed by femtosecond laser are studied to obtain high tooth surface quality. Considering the scientific problems of multi-scale effects in time/space of non-Fourier energy absorption and dynamic effects of physical action generated under correction conditions of femtosecond laser processing, such as multi-pulse energy serial coupling, variable thickness and focal length, material dynamic absorption, plasma shockwave, mutual temperature induction between material components, etc., a theoretical model of three-temperature complex coupling is created to study the influence regularity of laser process parameters on heat transfer, tooth surface temperature, ablation parameters, tooth surface morphology and behavior in the process of physical actions. The correction process plan is performed, the research on comprehensive model of tooth surface morphology control, the mechanism of flow stress change in multi-physical field coupling, and multi-objective process optimization method are carried out, and the control mechanism of tooth surface morphology and behavior affected by laser and correction process parameters are revealed. The theoretical innovations of micro-precision correction of femtosecond laser and method breakthroughs in key technologies would be obtained to promote a wide range of engineering applications of point contact conjugate surface gear transmission in transportation, large equipment, aeronautics and astronautics, engineering machinery and other fields.