基于热力耦合的金属切削过程分析及实验验证

Analysis and experimental verification of metal cutting process based on thermo-mechanical coupling

在传统切削仿真模型中,工件或刀具模型设置为刚体,不能有效反映切削过程中工件和刀具在热力耦合作用下的真实状态;增大材料导热率不能准确反映切削液与材料表面的热交换过程。针对传统模型存在的不足,建立可反映材料加工特性的J-C本构模型和动态失效模型,通过添加对流换热来模拟冷却介质的冷却作用,采用有限元软件ABAQUS进行仿真。分析了不同切削参数、刀具形状和冷却介质对AISI-1045钢加工过程的影响,并通过与实验数据对比验证仿真结果的正确性。

In traditional cutting simulation model, workpiece or tool model is set as rigid body, which can not effectivelyreflect the cutting process of workpiece and tool in thermodynamic coupling in real state; thermal conductivityincrease of material can not accurately reflect the cutting fluid and material surface heat exchange process. J-Cconstitutive model and dynamic failure model are established to reflect the material processing characteristics.The cooling effect of cooling medium is simulated by adding convective heat transfer. Finite element softwareABAQUS is used to simulate J-C constitutive model and dynamic failure model. The effects of different cuttingparameters, tool shapes and cooling mediums during the machining process of AISI-1045 steel are analyzed, andthe correctness of simulation results is verified by comparison with experimental data.