小孔的等面积分流法电火花加工试验研究

Experimental Study of Small-hole EDM by Area-Equalizing Current Dividing

介绍一种金属材料小孔的等面积分流法电火花加工。在电火花成形机上,通过改变制作电极的方法,采用电极等面积分流方法和稳定加工参数,进行机床稳定状态的临界面积以下尺寸的小孔加工。研究结果表明,等面积分流条件下,用相同加工参数,分流法的加工速度和放电间隙略有减小,而电极损耗稍稍变大。用分流法电火花加工小孔与不分流相比加工速度、放电间隙、电极损耗基本相似。研究结果证明,用分流法电火花加工小孔可改善机床的微小孔加工性能。

A method of electrical discharge machining is presented in which critical value of EDM size for small hole by current dividing is reduced less than primitive EDM system is. The area-equalizing characters of small-hole EDM by current dividing were studied. The research outcomes provided an area-equalizing foundation for small-hole EDM by means of current dividing/double electrodes both in theory and experiments. So, verification experiments to the stability and feasibility of EDM by new method based on area equalization were carried out and discussed. The evaluation results of the experiments show that drilling speed of EDM and discharge gap decrease a little, and electrodes wear increases slightly. There is thus a consistency in EDM process between single and double electrodes with one processing condition. The results also show that the proposed current dividing method based on area equalization is effective and practical.