Thermo-mechanical Modelling of Orthogonal Cutting with Chamfering Tool
Based on the plastic flow state of the workpiece material and the friction characteristics of the tool-chip in-terface,the unequal shear zone theory is combined with Oxley's slip line model,and the thermo-mechanical coupling model of orthogonal cutting with negative rake chamfering tool is proposed.The model mainly includes the primary shear zone and the chamfering deformation zone.Using the Johnson-Cook material constitutive model,the governing equations of flow stress,shear angle,friction angle and cutting temperature are established.The cutting force Fc and the feed force Ff are cal-culated respectively,by summing the components along the cutting speed direction and perpendicular to the cutting speed direction on the main shear zone and the chamfering deformation zone.The proposed prediction model is compared with the experimental and FE-simulation results and it is found that the relative error is within 15%.The influence of negative rake chamfering parameters on cutting force is analyzed.The research results provide reference for the structure parameters opti-mization and cutting performance the analysis for the chamfering tool.
chamfering toolorthogonal cuttingunequal shear zone theorycutting force prediction
NETL
NSTL
万方数据
