What Is Electrical Discharge Machining and Do You Understand the Principle?

Even if you can do electromachining, but do you really understand the principle of electromachining?

The following video shows you the micro-process of electromachining in full:

As we all know, traditional machining uses the feature that the tool is harder than the workpiece and relies on mechanical energy to remove metal to achieve processing. The essence is confront the tough with toughness.

traditional machining

In 1870, British scientist Priestley discovered that discharges had a corrosive effect on metals.

For a long time, discharge corrosion has been considered a harmful phenomenon.

For example, it can be found in daily life that when the plug is inserted and removed, the discharge often scorches the contact surface and corrodes rough and uneven pits.

discharge corrosion

With the advancement of science and technology, until 1943, the Lazarenkos of the former Soviet Union studied the phenomenon and causes of damage to the switch contacts by spark discharge, and found that the instantaneous high temperature of electric sparks could cause local metal to melt and vaporize and be corroded.

Then EDM method was invented.

At this point, people have for the first time deviated from the traditional processing of the old track, and successfully obtained the processing method of using softness to overcome hardness.

softness to overcome hardness

Electrical machining mainly includes two technological methods: EDM forming and WEDM.

Electrical Discharge Machining (EDM)

EDM forming

The tool electrode is usually a copper or graphite molded electrode, which can be any shape that can be made, and the processed shape is a corresponding cavity.

EDM forming

Wire Electrical Discharge Machining (WEDM)


WEDM is divided into low-speed wire cutting and high-speed wire moving. Generally, electrode wire with a diameter of 0.1mm ~ 0.3mm is used to process the ruled surface parts, which can be male die parts or female die holes.


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