Electrical Discharge Machining (EDM) is a non-traditional machining process that removes metal through electrical sparks. Unlike conventional methods, it is not limited by material hardness and can precisely create deep cavities, micro-holes, and complex structures in hardened steel, tungsten carbide, or superalloys. The three main types of EDM include wire cutting, die-sinking, and hole drilling, which are widely applied in mold making, aerospace, automotive, and medical industries. Although EDM has a slower processing speed, works only with conductive materials, and requires consideration of electrode wear and surface treatment, its advantages in high precision, zero cutting force, and superior surface finish make it an indispensable technology in precision manufacturing. Moreover, it continues to evolve in line with the trend toward smart manufacturing.
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