基于多尺度仿真的Inconel718切削过程研究

Research of cutting process based on multiscale simulation in machining Inconel718

镍基高温合金Inconel718因具有优良的性能而广泛应用于航空航天领域,但是起强化作用的强化合金元素以高硬度化合物形式存在,如Ti C、Nb C等相间硬质点,导致其切削加工性差,被定义为难加工材料。通过建立Inconel718的多尺度有限元模型,并加入含有cohesive单元的脆性相颗粒进行切削仿真,深入研究切削Inconel718过程中脆性相对锯齿形切屑形态和切削力的影响规律。结果表明:通过仿真结果与实验结果的对比分析,所建立的多尺度有限元模型与普通仿真结果相比,切屑形态、切削力等均与实验结果更加接近,表明所建立的多尺度模型能够更好的反映Inconel718的切削过程。

Nickel-based superalloy（ Inconel718） has been widely used in the aerospace field because of its excellent performance. However,the strengthening alloying elements exist in the form of high hardness compounds such as TiC and N C,which result in poor machinability. It is defined as difficult-to-process material. In this paper,the multi-scale finite element model of Inconel718 was established and the brittle phase particles containing cohesive element were used for cutting simulation. The influence of brittle phase on the shape of sawtooth chips and cutting force during cutting process was studied. The results show that,compared with the finite element model with no brittle phase,the results of chip shape and cutting force when using multi-scale finite element model（ adding brittle phase） is closer to the experimental results. This illustrates that the proposed multi-scale finite element model can better reflect the cutting process of Inconel718.