Discharge machining is a kind of special machining technology, which is widely used in the mold manufacturing and machining industry. Discharge machining can be used to process superhard materials and complex shapes that are difficult to process by conventional cutting methods. Discharge machining is usually used to process electrically conductive materials. Complex cavities or profiles can be machined in difficult materials such as titanium alloys, tool steels, carbon steels, and cemented carbide.