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Dongguan Jinchen Precision Mold Co., Ltd. is a manufacturer specializing in high-precision mold parts processing and technology research and development. It has more than ten years of production experience and has solved many supply and technical problems for customers.

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How does EDM work, how much do you know?

EDM is a method of machining using electrical and thermal energy that was studied and gradually applied to production in the 1940s. EDM is a method of machining a workpiece in a certain medium through the galvanic corrosion of the pulse discharge between the tool electrode and the workpiece electrode. Today we will learn about the principle of EDM.

The principle of EDM is based on the phenomenon of galvanic corrosion during pulsed spark discharges between the tool and the workpiece (positive and negative electrodes) to etch away excess metal in order to achieve the predefined machining requirements for the size, shape and surface quality of the workpiece.

The workpiece and the tool electrode are connected to two electrodes of different polarities of the pulse power supply. Tool electrode commonly used good conductivity, high melting point, easy to process corrosion-resistant materials, such as copper, graphite, copper-tungsten alloy and molybdenum. In the process, the tool electrode also has loss, but less than the amount of workpiece metal etching, or even close to no loss. The working fluid as a discharge medium, in the process of processing also plays a role in cooling, chip removal and so on. Commonly used working fluid is a lower viscosity, higher flash point, stable performance of the medium, such as paraffin, deionised water and emulsion.

When the pulse voltage is added between the two electrodes, and when a proper gap is maintained between the workpiece and the electrode, the working fluid medium between the workpiece and the tool electrode is knocked through, forming a discharge channel. A transient high temperature is generated in the discharge channel, which melts or even vaporises the surface material of the workpiece and also vaporises the working fluid medium. After the end of the pulse discharge, after a period of time interval, so that the working fluid to restore the insulation. The pulse voltage repeatedly acts on the workpiece and the tool electrode, and the above process is repeated continuously, and the workpiece material is gradually eroded away. The servo system constantly adjusts the relative position of the tool electrode and the workpiece, and automatically feeds to ensure that the pulse discharge is carried out normally until the required parts are processed.


Greetings! I’m Chris, deeply fascinated by mechanical parts and engineering. Let’s embark on a journey through design, functionality, and innovation in the hardware world.

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