单颗CBN磨粒磨削20CrMo的微观成屑过程研究

Research on Micro Chip Formation Process of 20CrMo by Single CBN Grain Grinding

为研究20CrMo材料的磨削去除机理与微观成屑过程,采用Johnson-Cook模型作为20CrMo的本构模型,应用有限元软件Abaqus建立了单颗CBN磨粒磨削20CrMo成屑过程的三维有限元分析模型。通过该模型探究不同磨削参数下的微观成屑过程,仿真分析结果表明:磨削速度对成屑过程中的耕犁与成屑阶段影响较大,磨削深度对滑擦与成屑阶段影响较大。设计了单颗磨粒磨削实验装置,对微观成屑进行了实验研究与分析,从磨痕沟槽和磨屑的整体特征来看,实验结果与仿真结果都较为吻合,验证了该三维仿真模型的正确性。

In order to study the material removal mechanism and micro chip formation process of 20 CrMo,Johnson-Cook model was used as constitutive model of 20 CrMo material,3DFEM simulation model of micro chip formation process was set up based on single CBN grain grinding of 20 CrMo in Abaqus.Effects of grinding parameters on micro chip formation process were discussed.Simulation results show that grinding velocity exerts more affects on plough and chip formation stage,and effect of grinding depth on sliding and hip formation stage is obvious.Experiment of single grain grinding was set up,and micro chip formation process was experimentally studied and analyzed.From the view of grinding groove characteristics and micro chip shape,experimental results agree well with the simulation results,therefore,3DFEM simulation model of micro chip formation process is experimentally verified.