基于J-C模型的Ti6Al4V切屑成形有限元模拟与分析

Finite Element Simulation and Analysis of the Chip Formation of Ti6Al4V Based on J-C Model

为了研究材料流动应力参数对高速切削加工中切屑形成有限元分析的影响,通过对材料本构模型、切屑分离、切屑断裂和刀-屑接触摩擦等进行建模,建立了切削加工的有限元模型,并验证了模型的正确性。基于该模型模拟了Ti6Al4V钛合金J-C模型在三组不同材料M1、M2和M3的参数条件下,利用DEFORM软件仿真模拟高速切削时切屑的形成过程,均得到了与试验相吻合的锯齿状切屑。与试验结果相比,M1的模拟效果最理想,M2和M3次之,从而为有限元模拟高速切削钛合金提供了较好的仿真手段和理论依据。

In order to study the influence of the material flow stress parameters on the chip formation in high speed machining, the finite element model, chip fraction and the friction between tool and chip were constructed and verified with the experimental data. Based on the J-C model of titanium alloys Ti6Al4V, 3 sets of the different material constants M1, M2 and M3 were input into the database of DEFORM material library to simulate the chip formation process, the results were similar with the chip morphology in experiments carried out under the same cutting conditions, and the simulation result with the constants of M1 is the best, M2 and M3 are after, which supplied a good way to finite element analysis of high speed machining titanium alloys.