CNC tool materials include high-speed steel (divided into W series high-speed steel and Mo series high-speed steel), cemented carbide (divided into tungsten-cobalt, tungsten-titanium-cobalt and tungsten-titanium-tantalum (niobium) cobalt), ceramics (pure alumina) and TiC additions), cubic boron carbide and polycrystalline diamond. The material for making the tool must have high high temperature hardness and wear resistance, necessary bending strength, impact toughness and chemical inertness, good manufacturability, and not easy to deform.
According to the requirements of CNC machining for tools, the general principle of selecting tool materials is to choose carbide tools as much as possible. Before the 1980s, high-speed steel was in the leading position. After the 1990s, cemented carbide surpassed high-speed steel. In recent years, many new varieties of cemented carbide have appeared, making cemented carbide tools widely used in milling, drilling, reaming, and filing. Therefore, whenever the processing conditions allow the use of carbide tools, try not to use high-speed steel tools. When necessary, ceramic, cubic boron nitride and diamond tools with better performance can also be selected in a targeted manner.