高速切削锯齿形切屑形成过程的有限元模拟

Finite element simulation of the formation process of a serrated chip in high-speed cutting

为了研究和预测高速切削切屑形成过程,使用有限元分析软件ABAQUS建立了高速切削高温合金的有限元模型,采用Johnson-Cook热粘塑性材料本构模型、剪切损伤切屑分离准则以及刀-屑界面粘结-滑移混合摩擦模型,对高速切削高温合金过程中锯齿形切屑的形态及切削力进行了研究。通过模拟与实验的对比分析,验证了有限元模型的准确性。切削参数对切屑形成的影响的研究结果表明,高速切削过程中锯齿形切屑的锯齿化程度、切削力以及绝热剪切带内的等效塑性应变随切削速度、刀具前角以及切削厚度的改变而规律性地变化。

In order to study and predict the formation process of the serrated chip in high-speed cutting （ HSC） , a finite element model of the high-speed cutting of superalloy was constructed by using the finite element analysis soft-ware ABAQUS. By the adoption of the Johnson-Cook thermal visco-plastic constitutive model, the separation criteri-on of the chip damaged in shearing and the sticking-sliding mixed friction model of the tool-chip interface, as well as the morphology of the serrated chip and the cutting force in the high-speed cutting of the superalloy were studied. Through the contrast analysis of the simulation and experiment, the results verify the accuracy of the finite element model. The research results of the effects of the cutting parameters on the chip show that the serrated degree of the chip formed in the high-speed cutting, the cutting force and the equivalent plastic strain inside the adiabatic shear band regularly change with the variation of the cutting speed, rake angle of the cutter and cutting thickness.