EDM 기술: 응용, 선택 기준 및 실제 지침

Picture a hardened H13 mold insert with a 0.8 mm deep rib and a square internal corner that no end mill can reach. The cavity has already been milled, but the last details need a process that cuts without cutter pressure. That is where EDM technology earns its place. Electrical discharge machining removes conductive metal with repeated controlled sparks in a dielectric fluid; it does not rely on mechanical force, so hardened steel, carbide, and thin ribs can be finished after heat treatment. The practical conclusion: EDM is a complement to milling, not a replacement. Use milling for bulk removal, then EDM for sharp corners, deep slots, fine detail, and hard materials.