钛合金整体叶轮铣削参数多目标优化

Multi-objective optimization of the parameters of titanium alloy integral impeller milling

钛合金整体叶轮是一种集合了钛合金难加工材料和整体叶轮难加工结构于一体的复杂零件。针对其加工困难、工艺参数选择难等问题,首先采用正交试验结果建立了铣削力和表面粗糙度经验预报模型;其次,根据叶轮粗加工特点建立工效率最高、加工成本最小的多目标规划模型,根据叶轮精加工要求建立加工效率最高、加工质量最优的多目标规划模型,并用优化的NSGA-Ⅱ算法进行求解;最后,进行加工效率试验对比,相比于初始设置的经验铣削参数,优化后参数进行加工,提高了24.1%的加工效率。实际应用表明:优化的铣削参数最优解集,方便了工艺人员在不同生产状况下最优参数的选择和调整。

Titanium alloy integral impeller is a complex part that contains difficult to treat titanium alloy material and hard-to-process integral impeller structure.It is difficult to solve the problem of processing difficulty and process parameter.Fi-rstly,an empirical prediction model of milling force and surface roughness is estab-lished by using orthogonal test results.Secondly,according to the characteristics of roughing of the impeller,a multi-objective planning model with the highest process-ing efficiency and the lowest processing cost is established.According to the requi-rements of the impeller finishing,a multi-objective planning model with the highest processing efficiency and the best processing quality is established.The optimal NSG-A-Ⅱ algorithm is used to solve the problem.Finally, the machining efficiency test was performed.Compared with the initial set of emp-irical milling parameters,the op-timized parameters were processed to improve the machining efficiency by 24.1%. The practical application shows that the optimal solution set of the optimized milling parameters is convenient for the selection and adjustment of the optimal parameters in different production conditions.