介质电导率对钛合金电火花加工性能的影响研究

Study on Influence by the Conductivity of Dielectrics on EDM Performance of Titanium Alloy

研究了水介质电导率对钛合金的电火花加工效率、电极相对损耗率和表面粗糙度的影响。试验结果表明,随着电导率增大,击穿电压不断减小,放电间隙和漏电流不断增大。电导率增长初期,放电间隙的增大将使加工效率上升,但随着消耗于放电通道和电解上的能量增多,加工效率有所下降;电极相对损耗率和表面粗糙度值都随着电导率的增长呈上升趋势。水介质存在一个最佳电导率69μs/cm,使钛合金电火花加工综合效果最优。

Dielectrics of different conductivities have been studied in EDM titanium alloy of to discuss the influence of conductivity on material removal rate （MRR）, electrode relative wearing rate （ERW） and surface roughness. The results show that the conductivity is the bigger, the break-over voltage is the smaller and the discharge gap and drain current are the larger. In the initial stage of conductivity increasing, MRR rises with the discharge gap wider. When there is more energy wasted in the discharge gap and electrolysis, MRR begins to decrease. Both EWR and Ra go up with the growth of conductivity. When the conductivity of water is 69 μS/cm, we can get the best machining effect in titanium alloy EDM.