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Machining requires high cutting tools and low lifetime

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  About 70% of the premature failure of various mechanical and electrical products is caused by wear and corrosion, and the two failure modes are closely related to the surface state of the material (Physics, chemistry and stress state, etc.). Therefore, the key to improve the performance of this kind of materials is to improve their surface properties.

  With the development of science and technology, the demand for surface properties of materials is getting higher and higher. In recent decades, the emergence of various gas deposition technology has made the research and application of surface engineering technology advance by leaps and bounds. These techniques not only to achieve the requirements of mechanical properties, such as wear resistance, friction reduction and anti - corrosion, but also on the surface in electromagnetism, optics, optoelectronics, thermal, superconducting and biological functional materials display skills to the full. Surface engineering not only makes low metal materials play a greater role in the performance and efficiency, but also has become an important means of developing new kinds of coating and film materials, and has great potential for application.
  With the development of machining industry, new requirements have been put forward for cutting tools. In addition to improving service life, it is also necessary to reduce pollution during cutting and use dry cutting as much as possible. When the cutting fluid can not be completely removed, as far as possible, only antirust agent and no organic substance are used, so that the cost of recycling can be greatly reduced.
  The diversity of cutting tools and the working state of the tool decide the selection of the cutting tools. When turning and drilling are different, the milling cutter should take into account the characteristics of its intermittent impact. Early development of coating with wear-resistant as the main focus, to improve the hardness as the main indicator. This kind of coating, represented by titanium nitride, has a higher coefficient of friction (0.4 to 0.6), and friction between the workpiece and the workpiece will produce a large amount of heat energy. Cutting fluid is usually used to avoid the deformation of tool overheating, influence the machining accuracy and prolong the service life.
  To solve the problem of reducing or eliminating the cutting fluid, the tool coating should not only make the tool have long life, but also have the function of self lubrication. Diamond coating (DLC) appeared in on some of the materials (Al, Ti and composite materials) machining showed advantages, but after years of research shows that the internal stress of diamond coating, high thermal stability and catalytic effect of ferrous metal between the SP3 structure to SP2 and other three kinds of disadvantages at present, determines that it can only be applied to processing of non-ferrous metals, thus limiting its further application in machining area. But recent studies show that DLC coating on SP2 based structure (also known as graphite coating) hardness can reach 20 ~ 40GPa, there are no problems with the catalytic effect of ferrous metal, its low friction coefficient and good moisture resistance, cutting can be used when the coolant can be used dry cutting, the life of uncoated knife has increased exponentially, the processing of iron and steel materials are not problems, which caused the coating company, cutting tool manufacturer is of great interest. In time, this new kind of diamond coating will be widely used in the cutting field.

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