1. The spark discharge time must be extremely short, and it is intermittent and pulsed instantaneous discharge. Generally, the duration of each pulse should be less than 0.00 1s, so that heat cannot be conducted and diffused, thus partially corroding metals. Otherwise, it can only play the role of welding and cutting, just like arc continuous discharge, and cannot be used for size processing.
2. In electrochemical etching, not only the workpiece is etched, but also the tool electrode is etched, but the etching speed of the two electrodes is different, which is called "polarity effect". In order to reduce the consumption of tool electrodes and improve productivity, it is hoped that the more significant the polarity effect, the better, that is, the etching speed of the workpiece far exceeds the etching speed of tool electrodes. Therefore, DC pulse power supply should be selected for electric erosion machining. If AC pulse power supply is used, the total pole effect is equal to zero due to the changing polarity of workpiece and tool electrode. At the same time, it is necessary to correctly select the polarity, and generally adopt the positive polarity (that is, the workpiece is connected to the positive electrode and the tool electrode is connected to the negative electrode).
3. Electro-corrosion machining is carried out in liquid medium. Commonly used liquid media are kerosene, 10 engine oil, spindle oil, etc. Liquid medium can not only remove the corrosion products in the cracks, but also have the ability of insulation, cooling and improving corrosion.
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