When large turning tools and planing knives are equipped with a small cutter body on an assembled large tool holder, the small cutter body as the cutter head part can be made of 9CrSi steel or Wig Cr4V high-speed steel as the base body, and air-cooled after brazing to make the small cutter body reach a certain level. hardness, thereby increasing the service life of the tool.
High precision carbide tools. When machining high-precision workpieces on precision machine tools such as a coordinate wok bed, W18Cr4V high-speed steel can be used as the cutter body. The tool is air-cooled after brazing, and the cutter head has sufficient hardness (the smaller the shank, the higher the hardness after welding), which can ensure high precision and smoothness during machining. Since the expansion coefficient of high-speed steel is close to that of cemented carbide, the brazing stress is also smaller, and the tool life can also be improved. In some special cases, YG8 cemented carbide rods can even be used, or YT 60 with excellent brazing wear resistance and high hardness, or more hard, brittle and wear-resistant cemented carbide as the cutter body for super For finishing machining.
For dies that are subjected to intense impact or repeated thermal vibration under heating conditions (such as hammer dies for high-speed rotary die forging or sector plates for hot rolling, etc.), 9 CrSi steel can generally be used as the base material. In some cases where the use conditions are particularly bad or the size of the mold section is large, W 18Cr4V high-speed steel can also be used as the matrix to improve the thermal stability of the mold and reduce the brazing stress.
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