功能电极电火花诱导烧蚀加工模具钢Cr12实验研究

针对电火花加工效率低的问题，提出了利用功能电极向加工区域通入高压水和氧气，在电火花放电加工中引入金属在氧气中燃烧产生的化学能，蚀除金属材料.通过采用圆柱电极和功能电极对模具钢Cr12进行常规电火花加工和电火花诱导烧蚀加工实验，研究了电参数及非电参数对电火花诱导烧蚀加工的影响规律.结果表明：正极性烧蚀加工模具钢Cr12的加工效率达178.12 mm3/min，是相同条件下常规电火花加工的20.2倍，并具有明显的极性效应.烧蚀加工的加工效率MRR随脉宽和加工电流的增大呈近似线性增大趋势；随气压与液压之比的增大呈现先增大后减小的趋势；随着电极转速的增大呈现先增大后略有下降的趋势.

Experimental Study of Ablation Machining to Die Steel Cr12 by EDM-Induced with Function Electrode

To increase the efficiency of EDM (electrical discharge machining), this paper proposed a function electrode which could inject water and oxygen with high pressure into the machining area, while the chemical energy produced by the reaction of the metal with oxygen was used to remove the metal material in addition EDM. The experiments of the normal EDM with cylindrical electrode and the EDM-induced ablation machining with function electrode to die steel Cr12 were conducted and the influencing law of electric and nonelectric parameters on the EDM induced ablation machining was studied. The results show that the processing efficiency of positive polarity ablation machining on die steel Cr12 is 178.12 mm3/min which is 20.2 times compared with the normal EDM under the same condition, and the polarity effect is obvious. The MRR (material removal rate) of ablation machining increases approximately linearly with ton and I. With the increase of η which is the ratio of pneumatic and hydraulic, the MRR increases first and then decreases. And with the increase of electrode speed n, the MRR increases first and then decrease slightly.