电火花诱导可控烧蚀放电铣削实验研究

提出了一种电火花诱导可控烧蚀放电铣削加工方法,在中空管状电极中间歇通入氧气,在氧气通入阶段电火花引燃金属,利用金属燃烧产生的化学能进行烧蚀加工,氧气关闭阶段进行常规电火花铣削修整,保证表面加工质量与精度。通过实验研究了极性、脉冲宽度、脉冲间隔、低压电流、氧气压力和供氧间隔等工艺规准对电火花诱导可控烧蚀放电铣削加工材料蚀除率和电极相对损耗率的影响。结果表明:该加工方式适合采用正极性加工;电极相对损耗率保持较低的水平;进行粗加工时,应适当增加氧气通入时间,以增加材料蚀除率;进行精整加工时,则应减少氧气通入时间,增加电火花放电时间,以提高表面质量与精度。

Experimental Research of Controllable Spark-Inducing Combustion and EDM Machining

A novel machining method named controllable spar-inducing combustion and electrical discharge milling machining (EDM-Milling) is proposed. This machining method, in which the oxygen blows throughout the rotating tubular electrode intermittently, uses chemical energy of spark-inducing combustion to achieve material removal during the oxygen supply and utilizes traditional EDM to accomplish surface finishing when the oxygen is shut off. The influence factors of material removal rate and electrode relative wear rate are discussed, including polarity, discharge duration, discharge interval, peak current, pressure and the interval time of oxygen. The result shows that the workpiece should be connected to the anode, the electrode relative wear rate remains low, and the oxygen ventilation time should be prolonged to achieve high material removal rate in rough machining whereas the sparking discharging time should be increased to reach high surface quality and precision in finish machining.