How plastic mold edm machining polarity correctly

Dongguan Plastic mold factory of the vast number of colleagues, do you know what a arc in electrical discharge machining engineering effect and how to correct machining polarity? Jie vibration below small make up take you to get to know.

In edm process, whether the positive or negative, would receive into different degrees of corrosion, even if is the same material, is the cathode electric corrosion are also different. This point corrosion is due to the positive and negative polarity is different the same phenomenon called polarity effect. (polarity effect choice: use ti < 20 us short pulse precision work, should adopt positive polarity machining. With ti > 50 us, with a long pulse coarse semi-finishing, negative polarity processing should be adopted.

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