Electrical discharge machining (EDM) is the result of electrical spark corrosion during pulse discharge between electrodes. The main reason of electric spark corrosion is that a large amount of heat is generated in the spark channel during the spark discharge, which is hot enough to make the metal on the electrode surface partially melt or even vaporize and evaporate to be removed.
The electric brush is used on the converter or collector ring of the motor, and it is used as the sliding contact for leading out or leading in the current. There are many kinds of graphite products used in electrical engineering. The most widely used carbon brush is used in the sliding part of the rotating body of motor and generator as the conductor of current.
It will not melt under normal pressure and high temperature, and will not deposit metal during sliding; In the presence of water or oxygen, it still has self-lubricating property; In the absence of water or oxygen, there is an appropriate porosity, which can be saturated with the appropriate lubricant Strong chemical stability Proper resistance Wear resistance
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