Electrical Discharge Machining (EDM) is, in essence, a non-contact electro-erosion process. Both the tool electrode and the workpiece are submerged in a dielectric fluid (such as kerosene or deionized water) and maintained at a precise, minute gap of 0.01–0.1 mm. High-frequency pulsed discharges—generating instantaneous temperatures of 8,000–12,000°C—melt the workpiece material. It acts as a "sculptor" for complex internal geometries, such as mold cavities, film-cooling holes in turbine blades, and the contoured surfaces of medical implants.
        EDM is virtually unaffected by material hardness, allowing for machining even after a workpiece has been hardened (quenched).
For features that are inaccessible to milling cutters—or where milling would risk tool breakage—such as deep cavities, narrow slots, sharp internal corners (with radii as small as 0.005–0.05 mm), micro-holes (φ0.05–0.3 mm), complex-shaped film-cooling holes, and intricate 3D profiles, EDM serves as the only or the optimal solution.
        The process involves no mechanical cutting force, resulting in no deformation, micro-cracking, or burrs. This makes it exceptionally well-suited for medical implants, minimally invasive surgical instruments, and molds for electronic connectors.
        Through multi-stage or progressive discharge, dimensional accuracy can be refined to within ±0.001–0.002 mm, and surface roughness can reach a mirror-like finish (Ra 0.05–0.1 μm), eliminating the need for subsequent manual polishing.

Our typical machining equipment: