Precision EDM core is mainly reflected in the dimensional accuracy, precision profiling, surface quality requirements.
Processing with the size should be strictly combined, the requirements of up to ± 2-3μm;
Profiling precision requires a clear edge, bottom corner R value should be as small as possible (generally require R value is less than 0.02mm);
The depth error of the flatness from the edge part to the central part is within 2μm;
Surface quality requirements Rough surface roughness Ra should be less than 0.4μm (VDI12), or require mirror processing, the surface of the microscopic examination without exception;
The edges of the discharge entrance and the opening corner are intact. Under the microscopic examination, the burst boundary value can not be greater than 0.015mm.
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