为建立满足7055铝合金高速切削有限元模拟的本构模型,基于准静态拉伸实验和分离式霍普金森压杆(SHPB)动态冲击实验,采用变量分离和非线性拟合得出7055铝合金的初始Johnson-Cook(J-C)本构方程;结合高速铣削实验,基于Oxley切削模型的反求法对初始本构方程参数进行修正,建立7055航空用高强铝合金高温、大应变、高应变率材料本构模型。利用ABAQUS软件和获得的J-C本构方程建立7055高速切削有限元模型。有限元模拟的主切削力与实验结果相差较小,表明所建立的J-C本构方程能较好地应用于高速切削模拟。 In order to establish the constitutive model to meet the high-speed cutting finite element simulation of 7055 aluminum alloy, based on the quasi-static tensile test and the split Hopkinson pressure bar (SHPB) dynamic impact test, the variation and nonlinear fitting of 7055 aluminum alloy The initial Johnson-Cook (JC) constitutive equation was established. Combining with the high speed milling experiment, the inverse constitutive law based on the Oxley cutting model was used to modify the parameters of the initial constitutive equation to establish the high temperature, large strain and high strain rate materials Model. Using the ABAQUS software and the obtained J-C constitutive equation, the 7055 high-speed cutting finite element model was established. The difference between the main cutting force and the experimental result in the finite element simulation is small, which shows that the established J-C constitutive equation can be applied to high-speed cutting simulation well.