Development history of CNC tools

    At that time, the tool was made of high carbon tool steel, and the allowable cutting speed was about 5m/min. In 1868, British Mushet made alloy tool steel containing tungsten. In 1898, Taylor and White of the United States invented high-speed steel. In 1923, Germany´s Schlerter invented cemented carbide. When alloy tool steel is used, the cutting speed of the tool is increased to about 8 m/min; When high speed steel is used, the cutting speed is increased more than twice; When using cemented carbide, the cutting speed is more than twice as high as when using high-speed steel, and the surface quality and dimensional accuracy of the workpiece machined are also greatly improved. In 1938, German Degussa Company obtained a patent on ceramic cutting tools. In 1969, the Swedish Sandvik Steel Plant obtained a patent for the production of titanium carbide coated carbide blades by chemical vapor deposition. In 1972, Bangsha and Lagulan of the United States developed the physical vapor deposition method to coat a hard layer of titanium carbide or titanium nitride on the surface of cemented carbide or high-speed steel tools. The surface coating method combines the high strength and toughness of the matrix material with the high hardness and wear resistance of the surface layer, so that the composite material has better cutting performance. In the same year, General Electric Company of the United States produced polycrystalline synthetic diamond and polycrystalline cubic boron nitride blades. These non-metallic tool materials can make the tool cut at a higher speed.