电火花诱导可控烧蚀铣削深度对电极损耗影响的仿真研究

Simulation Research on the Milling Depth Influencing Electrode Wear of Controllable Spark-inducing Combustion-milling

电火花诱导可控烧蚀铣削加工具有加工效率高、相对电极损耗低等优点。采用Fluent软件对不同铣削深度条件下,氧气流场在放电间隙中的分布状况及其对相对电极损耗率的影响进行了模拟仿真。结果表明:在放电间隙由水平转向竖直方向后,氧气流会在靠近工件的区域形成高速流动区,而在靠近电极的区域形成低速流动区,从而使相对电极损耗率降低,且该现象会随着铣削深度的增加呈先增强、后减弱的规律。该结果为实际加工中选择铣削深度提供了理论依据,并通过实验验证了该模拟结果的正确性。

Controllable spark-inducing combustion-milling has advantages of high material removal rate and low relative electrode wear rate. Using the Fluent software,the distribution status of the oxygen flow field is simulated in the discharge gap under different milling depth,and the effect of the distribution on the relative electrode wear rate is analyzed. The result shows that the oxygen flow will form a high-speed flow area near the work-piece whereas form a low-speed flow area near the electrode when the discharging gap turns upward,which could induce the decrease of the relative electrode wear rate,and this phenomenon will appear a parabola form trend with the increase of milling depth. The result provides a theoretical basis for the choice of the milling depth better in the actual work,and the correctness of the simulation result is verified by experiment.