基于CFD技术的数控电解加工流场数值模拟

Numerical Simulation of Flow Field of NC-Electrochemical Contour Evolution Machining Based on CFD Technology

电解加工中阴极流场设计合理是保证加工正常进行的前提。针对数控展成电解精加工整体叶轮时使用的直线刃阴极流场设计,通过对阴极几何模型的建立,导出了数值模拟时所需要的数值模型。由电解加工过程中电解液运动为湍流状态,确定了采用标准k-ε模型对稳定加工状态时电解液流道中的流场进行了数值模拟,分析了流道结构对电解液流动速度的影响,其结果与试验结果基本吻合,表明采用流体动力学方法对电解加工中阴极流场设计进行理论指导是可行的。

The reasonable flow field is the foundation in electrochemical machining. The flow field’s design of linear cathode used in the NC-Electrochemical Contour Evolution Machining （NC-ECCEM） was discussed. The numerical model of the flow passage was built according to the geometrical model of the cathode. Then the numerical simulation of flow field in flow passage was performed by using the standard k-ε turbulence model when the turbulence state in electrochemical machining had been determined. At the same time the effect of cathode’s structure on the velocity of flow was analyzed according to the results of numerical simulation. Comparing the simulation results with the experimental results, it is indicated that guiding the design of the cathode by Computational Fluid Dynamics （CFD） simulation is accurate and practicable.