Electrical discharge is a kind of precision machining technology, often used to process high hardness, high precision metal workpiece, such as mold, parts and so on. It uses the principle of electric spark discharge to generate high-energy electric spark on the surface of the workpiece, so that the surface material of the workpiece can be locally melted, oxidized and evaporated, so as to achieve the cutting of the workpiece. This machining method can realize the machining of complex shapes without mechanical stress, so it is widely used in the field of precision manufacturing. is a kind of precision machining technology, often used to process high hardness, high precision metal workpiece, such as mold, parts and so on. It uses the principle of electric spark discharge to generate high-energy electric spark on the surface of the workpiece, so that the surface material of the workpiece can be locally melted, oxidized and evaporated, so as to achieve the cutting of the workpiece. This machining method can realize the machining of complex shapes without mechanical stress, so it is widely used in the field of precision manufacturing.