In order to establish the continuum material constitutive relation model of high speed cutting, The Johnson⁃Cook material constitutive model of 45CrNiMoVA was established with the the quasi static torsion test and the combination of right angle free cutting experiment, which can satisfy the requirement of high speed cutting simulation. Based on the Johnson⁃Cook constitutive model parameters, the model of right angle free cutting was established using finite element analysis software ABAQUS. The chip thickness, main cutting force and feed force in the process of cutting were simulated and compared with the experimental measurements. Comparison results showed that the simulation results of cutting resistance was big than that of cutting tests due to the abrasion of the cutter. The main cutting force and chip thickness simulation error was within 10%compared with the experimental measurement, which indicates that the accuracy of the model is good. Finally, the Johnson⁃Cook material constitutive integrated modeling system was developed using the VB and C language and practicability of this model was verified.%为建立连续介质材料高速切削的材料本构关系模型，以45CrNiMoVA材料为研究对象，通过准静态扭转试验和直角自由切削试验相结合的方法，建立了满足高速切削仿真要求的45CrNiMoVA材料的Johnson⁃Cook本构模型。采用建立的Johnson⁃Cook本构模型参数，利用ABAQUS有限元分析软件建立了直角自由切削的有限元模型，对切削过程中的切屑厚度、主切削力、进给抗力进行了仿真，并将仿真预测值同试验测量值进行了对比。结果表明：由于切削仿真过程中刀具不存在磨损，进给抗力的仿真误差较大；主切削力和切屑厚度的仿真预测值与试验测量值的误差在10％之内，模型的准确度较好。最后，利用VB和C语言，开发了Johnson⁃Cook材料本构集成建模系统，并验证了其使用效果的实用性。
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