镍基合金Inconel 718薄壁件铣削加工数控程序和切削参数优化

薄壁件加工过程因切削力波动较大可导致切削过程不平稳,需对加工工艺进行优化。建立了镍基合金Inconel718薄壁件铣削加工数控编程优化模型,模型由数控编程、材料数据库和数控加工仿真3个模块组成。在UG中建立工件实体模型,并生成相应NC加工代码;基于Power Law本构方程,考虑材料热力学动态性能和材料分离准则对切削力和切削温度的影响,采用有限元仿真软件AdvantEdge FEM获得镍基合金车削加工的切削力和切削温度等参数;将工件毛坯模型、NC加工代码、材料数据导入Production Module中,对加工过程进行优化。结果表明:利用优化后的数控程序进行加工,可减小切削力波动,有助于改善薄壁件加工过程中的稳定性。

Optimization of NC Programming and Cutting Parameters in Milling of Inconel 718 Thin wall Parts

The fluctuations of cutting force may result in unstable machining processes when the thin-wall parts are machined. So cutting process needs to be optimized. An optimized model of NC programming for milling of Inconel 718 thin-wall parts was estab-lished. The presented model consists of NC programming, material database and CNC machining simulation. The solid module of work-piece was developed with UG software and NC codes were programmed. The parameters of cutting force and temperature for Inconel 718 were simulated by finite element method using AdvantEdge FEM based on the Power Law constitutive equation. The effects of the work-piece material properties and material separation criterion on cutting force and cutting temperature were analyzed. The model of work-blank, NC codes and materials were input into Production Module to optimize the cutting process. The result shows that the proposed method of optimization model of NC programming can diminish the fluctuation of cutting force, which will be beneficial to improve the stability of thin-wall parts machining.