中文摘要：

采用纳秒脉冲电流进行微细电解加工时,极间加工间隙很小,因此加工过程的稳定性是影响加工精度的重要因素。根据加工精度和稳定性的关系,建立了试验系统,设计了电解液轴向正流供液的电极喷嘴,利用电流传感器检测加工过程状态,采用短路对刀法确定电极初始间隙,进行了加工参数对稳定性和加工精度的影响试验。试验结果表明：电解液的平缓流动更新比保持电解液静止的加工状态更加稳定。当脉冲宽度小于25 ns时,加工过程的稳定性会显著下降。脉冲宽度为40 ns,电压幅值为4 V,占空比为1∶10时,可以实现稳定的加工状态,并得到较高的加工精度。

英文摘要：

While the nanosecond pulses current is applied into the electrochemical micro-machining,the stability of the machining process is an important factor affecting the machining precision due to the very small inter-electrode gap.The experimental system is developed according to the relationship of the precision and the stability.The electrode nozzle is devised to conduct the electrolyte flowing along the axis direction.The current sensor is used to detect real-time machining process state.The method for locating short-circuit is proposed to determine the initial inter-electrode gap exactly.The experiments are carried out to investigate the effect of the process parameters on the stability and the precision.The result shows that calm flowing and renewing electrolyte achieves more stable process than resting electrolyte.While the pulse on-time is less than 25 ns,the stability decreases obviously.The stable process and the good precision are well implemented with pulse on-time 40 ns,voltage 4 V and duty factor 1∶10.