Electrochemical machining (ECM) is a type of electroforming, which is further categorized into six types: electrolytic machining, conductive grinding, electrochemical polishing, electroplating, electroetching, and electrolytic smelting. Electroforming: Electrochemical machining has been used in my country since the 1950s, and is currently most widely used in the aviation industry, where it is used to process engine blades, cylindrical parts, spline holes, and other parts.