Mitsubishi Electric EA28V

Mitsubishi Electric's Digital Fuzzy Expert System (DFES) is a generator control algorithm that uses fuzzy logic — a form of AI-based decision making that handles imprecise, continuously varying conditions — to adjust discharge parameters in real time. During sinker EDM, the gap condition (the relationship between electrode and workpiece) constantly changes as material is removed, the electrode wears, and flushing conditions vary. The DFES monitors gap sensor signals and adjusts pulse width, off-time, and servo parameters to keep the process in the optimal range, similar to how an experienced operator would manually tune the machine but faster and more consistently.

The EA28V-ADVANCE is an enhanced version of the EA28V with an upgraded generator configuration, additional technology table depth, and improved surface finish capability — achieving Ra 0.10 um or better versus the standard EA28V's Ra 0.18 um. The EA28V-ADVANCE also typically includes additional control features and automation readiness. The standard EA28V is appropriate for the majority of precision mold and die work; the ADVANCE version is justified when the finest possible surface finish and maximum generator flexibility are required.

Yes. The DFES generator includes technology tables for tungsten carbide workpieces with copper-tungsten electrodes. Carbide sinker EDM requires lower discharge energy than steel, and the cobalt binder in cemented carbide dissolves into the oil dielectric during machining, requiring more frequent oil filtering. Mitsubishi recommends using fresh dielectric or a dedicated dielectric system for carbide work to prevent contamination of other workpiece materials. Surface finish results on carbide are comparable to those on tool steel using appropriate technology table settings.

The EA28V accommodates any electrode geometry that fits within the Z-axis envelope clearance above the workpiece. Electrodes can be solid graphite, copper, copper-tungsten, or composite forms — including complex 3D electrode shapes for contoured cavity sinking, multiple-impression electrodes for simultaneous multi-cavity production, and orbital (rotating) electrode shapes. The optional C-axis rotary spindle enables additional electrode geometry options for helical and radially symmetric cavity forms.

Routine maintenance for the EA28V includes oil dielectric filtration and periodic oil replacement or replenishment, electrode holder cleaning and inspection, guide and filter cleaning for the Z-axis servo system, and annual calibration checks. Mitsubishi Electric provides maintenance schedules specific to the EA28V. The oil dielectric should be tested periodically for contamination and viscosity. High-volume shops typically schedule preventive maintenance quarterly; lower-volume shops often defer to the annual schedule with operator-performed daily checks.