When we EDM the mold, both the positive electrode and the negative electrode will be corroded by different degrees of electrode, even if the corrosion amount of the two electrodes of the same material is different, we will find that one electrode is more corroded than the other electrode. This phenomenon is usually called the polarity effect. If the two electrode materials are different, the effect of polarity will be more obvious. Usually, the processing of the workpiece connected to the...