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介绍了以高压纯水为介质的微细深孔高速电火花加工的原理、工艺以及必备条件。通过实例说明这种方法加工深细孔的长径比可大于１００，生产率比一般的电火花小孔加工提高１５０倍以上。
The principle, technology and prerequisites of high speed electro-discharge machining of fine deep hole with high pressure pure water are introduced. An example shows that this method of processing the aspect ratio of the deep hole can be greater than 100, and the productivity is improved more than 150 times than that of the ordinary EDM.