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本文叙述了引入超声作用于精微小孔电火花加工中的实践效果。试验中应用了超声在液体介质中的“空化”现象,由于“空化”的作用使电火花加工中的电蚀产物从放电间隙中细化并抛出,从而提高了电源的脉冲能量的利用率,使加工速度比采用单纯RC非独立式脉冲电源加工时,提高了将近十倍;且使“极限加工深度”也大大提高(小孔深径比可达七十倍)。通过有代表性的加工实例,可以看出,采用超声RC非独立式脉冲电源,其应用范围可能扩大到精微型孔的加工,并为精微深孔加工提供了实验依据。文中还就试验装置中超声的产生和传输——通过PZT压电换能器和富里哀变速器来产生和传输中的参数作了定性的讨论。
This article describes the introduction of ultrasonic effect on the micro-hole EDM practice. The phenomenon of “cavitation” of ultrasonic in liquid medium was applied in the experiment. Due to the function of “cavitation”, the electric erosion products in EDM were refined and thrown out from the discharge gap to improve the pulse energy Utilization rate, processing speed than the use of simple RC non-independent pulse power processing, increased nearly ten times; and to “limit the depth of processing” is also greatly improved (hole depth ratio of up to seventy times). Through representative processing examples, we can see that the use of ultrasonic RC non-independent pulse power supply, the scope of its application may be extended to the processing of fine holes, and provides a deep hole for processing experimental basis. The article also qualitatively discusses the generation and transmission of ultrasound in the test setup - the parameters generated and transmitted by the PZT piezoelectric transducer and the FURA transmission.