利用引弧微爆炸加工装置,以氮化硅工程陶瓷为加工对象,对引弧微爆炸加工过程的喷嘴烧损及材料去除率进行了研究。通过喷嘴烧损实验,研究了喷嘴烧损规律及喷嘴直径对材料去除率的影响;利用正交实验方法,建立了材料去除率经验模型并分析了材料去除率随加工参数的变化规律。结果显示：喷嘴直径随着脉冲次数的增加而扩展,当直径在2.4～2.8 mm之间时,可以产生最好的加工质量和最大的材料去除率;四个主要加工参数对材料去除率的影响显著,材料去除率随着工作电流、工作气压、工作脉宽的增大而增大,随着工作距离的增大而减小;建立的指数型经验模型简单可靠,与实验结果吻合良好,可以用于材料去除率的预测及控制。
By using micro-detonation with striking arc machining unit,Si3N4 ceramics was machined to study the nozzle burning loss and material removal rate in the process of micro-detonation machining with striking arc.The law of nozzle burning loss and the influence of nozzle diameter on material removal rate were examined by nozzle burning experiment.An empirical model of material removal rate was established and the influencing laws of processing parameters on material removal rate were analyzed.Experimental results show that the nozzle diameter expands with the increasing of machining pulse times.When the diameter is between 2.4-2.8 mm,the best workpiece quality and the highest material removal rate can be achieved.It is found that the material removal rate decreases with the increment of working distance and increases with the growth of working current,working pressure and pulse width.The exponential type empirical model established in this study is simple and reliable and consists with experiment results well.The model can be used to predict and control the material removal rate for the micro-detonation machining with striking arc.
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