The variety of cutting tools and the working state characteristics at the time of use determine the difference in the choice of tool plating. Different from turning and drilling, the milling cutter should also consider the characteristics of its intermittent impact. Early development of the coating is mainly focused on wear resistance, with hardness as the main indicator. Such coatings represented by titanium nitride have a high coefficient of friction, and a constant friction between the workpiece and the workpiece during processing will generate a large amount of heat energy. Cutting tools are widely used in industrial production processes. Now that the level of the machining industry is increasing, the industry has put forward new requirements for tools. In addition to the improvement of process technology, green and sustainable production has become a new trend. In addition to increasing the service life, the tool products are also required to reduce the contamination during cutting, and dry cutting is used whenever possible. When the cutting fluid cannot be completely eliminated, it is best to contain only the rust preventive agent and no organic matter, which can greatly reduce the cost of recycling. In order to avoid the tool overheating and deformation, which affects the machining accuracy and prolongs its service life, cutting fluid is usually used. To solve the problem of reducing or eliminating cutting fluid, the tool coating should not only have a long life, but also have a self-lubricating function. The appearance of diamond-like coatings has shown advantages in the mechanical processing of certain materials, but after years of research, the internal stress of the diamond-like coating, the poor thermal stability and the catalytic effect with the ferrous metal make the SP3 structure to SP2. Three shortcomings, such as the transition, have determined that it can only be applied to the processing of non-ferrous metals, thus limiting its further application in machining. Recent studies have shown that the hardness of diamond-like coatings based on SP2 structure can reach 20-40 GPa, but there is no problem with the catalyzed effect of ferrous metals. The friction coefficient is very low and has good moisture resistance. When cutting, it can be used for both dry coolant and dry cutting. Its life is doubled compared with non-coated knives. There is no problem in processing steel materials, which has caused great interest in coating companies and tool manufacturers. Over time, this new type of diamond-like coating will find wide application in the field of cutting.
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