Inconel 718介观尺度薄壁件微铣削力预测

Micro-milling Force Prediction of Inconel 718 Thin-walled Parts

Inconel 718介观尺度薄壁件在航空航天、医疗和通讯等领域的需求日益增长.薄壁微铣削变形是领域内的难题,而微铣削力是引起加工变形的重要因素.为实现薄壁微铣削力的预测,建立了Inconel 718薄壁微铣削加工过程的有限元仿真模型,以及微铣刀和薄壁件的几何模型,完成了网格划分,并验证了网格独立性.采用Johnson-Cook本构模型和失效准则描述材料本构关系和切屑分离准则,修正库仑模型描述摩擦特性.对比薄壁微铣削过程仿真模型输出的微铣削力与实验测量结果,最大和平均相对误差分别为11.23%,7.04%,验证了模型的有效性和准确性.

Inconel 718 mesoscopic thin-walled parts are in increasing demands in aerospace,medicine,communication equipment and other fields.Thin-wall micro-milling deformation is a difficult problem in the field,and micro-milling force is an important factor causing machining deformation.In order to predict the force of thin-wall micro-milling,the finite element simulation model of Inconel 718 thin-wall micro-milling process was established together with the geometric models of the micro-milling tool and thin-wall parts,the mesh division was completed,and the mesh independence was verified.The Johnson-Cook constitutive model and failure criterion were used to describe the material constitutive relationship and chip separation criterion respectively.The modified Coulomb model was used to describe the friction characteristics.The results show that the maximum and average relative errors are 11.23%and 7.04%,respectively,by comparing the micro milling force output of the simulation model with the experimental results,which verifies the effectiveness and accuracy of the model.