航空钛合金高效插铣加工实验与多目标优化研究

钛合金整体叶盘是航空发动机的重要零部件，结构复杂，加工难度大。插铣加工因其轴向承受能力强和刚性大等特性，非常适合加工钛合金整体叶盘这类难加工、结构复杂的零部件。针对钛合金插铣加工效率的问题，采用响应曲面法设计插铣实验，建立切削力经验模型，以切削力和材料去除率为目标，采用NSGA-II算法进行多目标优化获得Pareto最优解。研究表明:切削力随主轴转速的增加而缓慢减小，随切削宽度、切削步距和每齿进给量的上升而增加；与实验初始参数组合相比，优化后的材料去除率提高了81.19%，而切削力减小了23.68%，达到了本研究的高效加工目标。

Study on Multi-objective Optimization and High Efficiency Plunge Milling Experiment of Titanium Alloy for Aviation

Titanium alloy blisk is an important part in the aero-engine, which has complex structure and difficult machining. Plunge milling is very suitable for machining difficult-to-cut materials such as titanium alloys and complex components due to its strong axial bearing capacity and high rigidity. Aiming at the machining efficiency in plunge milling of titanium alloy, the plunge milling experiment is designed by using the response surface methodology, and an empirical model for cutting force is established. With the goal of cutting force and material removal rate, the NSGA-II is used for multi-objective optimization to obtain the Pareto optimal solution. The results show that the cutting force decreases slowly with the increasing of spindle speed, and increases with the increasing of cutting width, cutting step and feed per tooth. Comparing with the experimental initial parameter combination, the optimal material removal rate increased by 81.19%, and the cutting force reduced by 23.68%. The results show that the present method can achieve the goal of high efficiency machining.