The materials used to make the tool must have high hardness and wear resistance at high temperatures, necessary bending strength, impact toughness and chemical inertness, good processability (cutting, forging, heat treatment, etc.), and are not easily deformed.
Usually when the material hardness is high, the abrasion resistance is also high; when the bending strength is high, the impact toughness is also high. However, the higher the material hardness, the lower its flexural strength and impact toughness. High-speed steel has high bending strength and impact toughness, and good machinability. Modern is still the most widely used tool material, followed by hard alloys.
Polycrystalline cubic boron nitride is suitable for cutting high hardness hardened steel and hard cast iron, etc.; polycrystalline diamond is suitable for cutting nonferrous metals, alloys, plastics and fiberglass, etc.
Can also be used for high-speed steel tools, such as drills, hobs, taps and milling cutters. The hard coating acts as a barrier against chemical diffusion and heat conduction, slows down the wear of the tool during cutting, and increases the life of the coated insert by approximately 1-3 times compared to uncoated ones.
Due to the high temperature, high pressure, high speed, and parts working in corrosive fluid media, more and more difficult-to-machine materials are applied, and the automation level of cutting and the requirements for processing accuracy are getting higher and higher. In order to adapt to this situation, the development direction of the tool will be to develop and apply new tool materials; to further develop the tool’s vapor deposition coating technology, to deposit a higher hardness coating on a high-toughness, high-strength substrate to better solve The contradiction between the hardness and strength of the tool material; the development of the structure of the indexable tool; the improvement of the tool’s manufacturing precision, the reduction of the difference in product quality, and the optimization of the use of the tool.