EDM Drilling What are the electrodes for EDM Electrode material must be good conductivity, low loss, easy modeling, and has a stable processing, high efficiency, rich source of materials, cheap and so on. Common electrode materials are copper, graphite, brass, copper tungsten alloy and steel, cast iron and so on.

　　Copper electrode: it is fine texture, good processing stability, relatively low electrode wear, wide adaptability, especially for the manufacture of precision pattern die electrode, the shortcomings of fine cars, grinding and other mechanical processing difficulties.

　　Graphite electrode: especially for large pulse width and high current cavity processing, the electrode loss can be done less than 0.5%, high temperature, deformation is small, easy to manufacture, light weight. Disadvantages: easy to fall off, dregs, poor surface roughness, finishing easy to pull the arc.

　　Brass electrode: brass electrode is most suitable for small and medium size processing under the circumstances, good stability, manufacturing is also easier, but the drawback is that the electrode loss rate than the average electrode are large, not easy to be processed a forming, so generally only Used in a simple mold processing, through-hole processing, take off the taps and so on.

　　EDM Drilling Cast iron electrode: the current application of a less material, the main features: easy to manufacture, low prices, rich sources of materials, discharge processing stability is also better, especially for composite pulse power processing, electrode losses generally up to 20% The most suitable for processing die.

　　EDM Drilling Steel electrode: steel electrode in China more applications, it is compared with the cast iron electrode, poor processing stability, efficiency is low, but it can be integrated into the electrode and punch, as long as a forming, can shorten the electrode and punch Manufacturing hours. Electrode wear and cast iron similar to the "steel to fight steel" cold die processing.

　　Copper tungsten alloy and silver tungsten alloy electrode: the tungsten content is high, so the processing of the electrode loss is small, machining is also easier, especially for tool steel, carbide and other mold processing and special shaped hole, Processing. Processing stability, in the discharge processing is a better performance of the material. Disadvantages: more expensive, especially silver tungsten alloy electrode.