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Interpretation of the carbide and coating

      Cemented carbide powder metallurgy method is used to make the alloy material, it is made of high hardness, high melting point metal carbides WC, TiC, such as powder, cobalt etc metal binder sintered at high temperature and be become.
Cemented carbide of high hardness, room temperature can reach 89-93 hra, abrasion resistance and heat resistance were higher than that of tool steel, in 800-1000 degrees can still normal cutting, the cutting speed is several times that of the high speed steel, tool life is raised a few times, and can machining high speed steel cutter cutting hard material, so widely used.It is not without bending strength and impact toughness, lower than the high speed steel blade is not to be grinding shortcomings such as sharp as high speed steel tools.

     Coating technologyOf cutting tool coating the mechanical processing industry is the way a big change, it is on the cutting tool toughness higher substrate coated with a layer, layer and multilayer materials with high hardness, high wear resistance, high temperature resistant of thin layer (such as TiN and TiC, etc.), make the cutting tool has a comprehensive, good comprehensive performance.Uncoated HSS hardness was only about 62-68 HRC (760 ~ 960 hv), the hardness of cemented carbide is only 89 ~ 93.5 HRA (1300 ~ 1850 hv);And after the coating surface hardness can reach more than 2000 ~ 3000 hv.In industrial production, the use of coated tools can improve the machining efficiency and machining precision, prolong life, reduce the cost.

        For nearly 30 years, the rapid development of cutting tool coating technology, coated tools has been widely applied.Coating HSS cutting tools and coating cemented carbide cutting tools have accounted for more than 50% of the total tool use.In Western Europe, due to limited resources and machining efficiency, increase, as well as numerical control technology and difficult-to-machine materials coated tools is developing at an astonishing speed passive to advance.Western developed countries use coated tools accounted for the proportion of the indexable insert has risen from 26% in 1978 to 90% in 2005, about 80% in the new type of nc machine tools used in cutting tool is coated tools.The advantages of the coated toolsBecause the surface coating material has high hardness and wear resistance, and high temperature resistance.

       So compared with uncoated tool, coated tools allowed the use of higher cutting speed, so as to improve the machining efficiency;Or can under the same cutting speed, improve the knives' service life.

        As coating material and processed materials, the coefficient of friction between the small, so the coating tool cutting force is smaller than the uncoated tool.With coated cutting tool processing, parts of the surface of the finished quality is better.Due to the comprehensive performance of coated cutting tool is good, so the coated cemented carbide blade has good generality and a blade coating cemented carbide grades has a wide range of use.Cutting tool coating technology in China compared with the developed industrial countries has very big disparity, the number of coated tools far, only accounts for roughly 20% of the total tool.Which used on nc machine tools and machining center is in the majority, in the ordinary course of the nc machine tools is fairly small, mainly by recognition problem and the influence of such factors as price.

     In China, therefore, the development and application of cutting tool coating technology has many potential of room for improvement.Cutting toolAccording to the needs of the development of manufacturing, multifunctional composite cutting tools, high-speed and efficient tool will become the mainstream of development.In the face of increasingly difficult processing materials, cutting tool industry must improve the cutting tool materials, research and development of new cutting tool materials and cutting tool structure more reasonable.

      Hard alloy materials and coating application.Fine particles, and ultra-fine grain cemented carbide material is the development direction;Nano coating, the structure of the gradient coating layer and a new structure, materials will be improved to a cutting tool performance;Physical (PVD) coating applications continue to increase.New cutting tool materials.Ceramic, metal, ceramics, silicon nitride ceramics, PCBN, PCD cutting tool material toughness enhanced, increasing application occasions.Cutting technology rapid development.High speed cutting, hard cutting, dry cutting continued rapid development, application scope is expanding rapidly.Ratio has risen from 26% in 1978 to 90% in 2005, about 80% in the new type of nc machine tools used in cutting tool is coated tools.The advantages of the coated toolsBecause the surface coating material has high hardness and wear resistance, and high temperature resistance.So compared with uncoated tool, coated tools allowed the use of higher cutting speed, so as to improve the machining efficiency;Or can under the same cutting speed, improve the knives' service life.

        As coating material and processed materials, the coefficient of friction between the small, so the coating tool cutting force is smaller than the uncoated tool.With coated cutting tool processing, parts of the surface of the finished quality is better.Due to the comprehensive performance of coated cutting tool is good, so the coated cemented carbide blade has good generality and a blade coating cemented carbide grades has a wide range of use.Cutting tool coating technology in China compared with the developed industrial countries has very big disparity, the number of coated tools far, only accounts for roughly 20% of the total tool.Which used on nc machine tools and machining center is in the majority, in the ordinary course of the nc machine tools is fairly small, mainly by recognition problem and the influence of such factors as price.In China, therefore, the development and application of cutting tool coating technology has many potential of room for improvement.