Overview of EDM
Electrical discharge machining, or EDM, is an unconventional method in which heat energy is used to remove material from the workpiece. Very similar to processes such as laser cutting, EDM does not require mechanical force in the removal process. EDM is very popular in tool and die manufacturing for its applicability, especially to hard materials such as titanium or particularly complex shapes that are difficult to obtain through milling.
To put it simply, electrical discharge machining is a manufacturing process that uses electrodes to precisely remove material from a conductive material. In the small gap between the workpiece and the electrode, a discharge occurs which removes the material by melting or vaporizing. For this process, the electrode and the workpiece must be immersed in the dielectric fluid.
Why need EDM?
EDM has brought many benefits to manufacturing companies. The versatility provided by EDM in handling hard metals is a major advantage. It can be used to control the shape or physical properties of most materials. Using EDM, it is easier to machine harder metals, including hard metals such as titanium, tungsten carbide and steel. In addition, EDM can be used to obtain a high precision profile on the workpiece, and when the discharge is triggered, they will heat the workpiece. The surface of the workpiece will become smoother and cleaner without the need for additional edge cleaning or deburring, which is usually desired by manufacturing companies.
Because of these advantages, EDM is often used in the aerospace and automotive industries for the development of high precision and advanced engine components.
Benefit of use EDM
•It can be used for small workpieces that are usually damaged by conventional cutting tools. In the EDM, the electrode is not in direct contact with the material, so it will not be damaged.
•Get better at making the geometrical shape you want
•Higher surface smoothness.
•Can create complex shapes that may be difficult to generate
By controlling many possible changes in the surface layer during the EDM process to ensure the product’s surface specifications and to produce a perfect product (i.e., without any surface damage), the quality of the product is ensured and the quality of the product is improved.