Machining requires high requirements for cutting tools and reduces pollution

Release time：2019-12-28　　　　 Time to browse

　　Machining requires high requirements for cutting tools and reduces pollution.

　　About 70% of the premature failure of mechanical and electrical products is caused by wear and corrosion, both of which are closely related to the surface states (physical, chemical and stress states, etc.) of the materials. Therefore, the key to improve the performance of this kind of material is to improve its surface performance.

　　With the development of science and technology, the surface properties of materials are more and more demanding. With the rise of various vapor deposition technologies in recent decades, the research and application of surface engineering technology have made great progress. These technologies not only meet the requirements of mechanical properties, such as wear resistance, friction reduction and corrosion resistance, but also excel in the field of functional materials related to the surface, such as electromagnetism, optics, optoelectronics, heat, superconductivity and biology. Surface engineering not only makes cheap metal materials play a greater advantage in terms of performance and benefit, but also has become an important means to develop various new coatings and thin film materials, with great application potential.

　　With the improvement of the level of machining industry, new requirements are put forward for cutting tools. In addition to improving service life, it is also required to reduce the pollution during cutting and use dry cutting as far as possible. When the cutting fluid can not be completely eliminated, try to make it contain only rust inhibitor and no organic matter, which can greatly reduce the cost of recycling.

　　The variety of cutting tools and the characteristics of the working conditions determine the choice of tool coating. Turning and drilling are different, milling cutter should consider its intermittent impact characteristics. Early development of coating to wear as the main focus, to improve the hardness as the main index. Such coating represented by titanium nitride has a high friction coefficient (0.4 ~ 0.6), and continuous friction between processing and workpiece will produce a lot of heat energy. Cutting fluid is usually used to prevent the tool from overheating and deforming, which affects the machining accuracy and prolonging its service life.

　　To solve the problem of reducing or eliminating the cutting fluid, the tool coating should not only give the tool a long life, but also be self-lubricating. Diamond-like coating (DLC) in for some materials (Al, Ti and their composites) machining shows advantage, but after years of research shows that the internal stress of diamond-like coating, high thermal stability and catalytic effect with black metal to SP2 and SP3 structure of three kinds of faults, determines its current can only be applied to the processing of non-ferrous metals, which limit its further application in machining. But in recent years, research has shown that gives priority to with SP2 structure of the diamond-like coating (also known as graphite coating) hardness can be up to 20 ~ 40 gpa, but does not exist the problem with the black metal catalyst effect, its friction coefficient is very low and has good resistance to wet, can be used when cutting coolant can also be used for dry cutting, its life, higher than that of the coating knife has multiplied the processing steel material there is no problem, and thus caused the great interest coating company, cutting tool manufacturer. In time, this new diamond-like coating will be widely used in the cutting field.