‌‌ slow wire walking, also known as ‌ low speed wire walking, is the use of continuous moving fine metal wire (called electrode wire, generally ‌ copper wire) as the electrode, pulse spark discharge on the workpiece, produce more than 6000 degrees of high temperature, corrosion of metal, cut into the workpiece a kind of ‌ CNC processing machine tool. ‌ The principle of slow wire processing is that there is a gap between the online electrode and the workpiece, and the continuous discharge removes the metal. This processing method has the characteristics of smooth surface and high precision, and the accuracy can usually reach within 0.01mm. Slow wire machine belongs to the high degree of mechanical automation in CNC machine tools, widely used in ‌ precision mold, ‌ hardware parts processing and other fields. ‌