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06

2023

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11

Machining places high demands on tools while reducing contamination

About 70% of the premature failure damage of various electromechanical products is caused by wear and corrosion, and these two failure modes are closely related to the surface state of the material (physical, chemical and stress state, etc.). Therefore, the key to improve the performance of such materials is to improve their surface properties.


About 70% of the premature failure damage of various electromechanical products is caused by wear and corrosion, and these two failure modes are closely related to the surface state of the material (physical, chemical and stress state, etc.). Therefore, the key to improve the performance of such materials is to improve their surface properties.

With the development of science and technology, the requirements for the surface properties of materials are becoming higher and higher. The rise of various vapor deposition techniques in recent decades has led to a rapid development in the research and application of surface engineering technologies. These technologies have not only realized the requirements of mechanical properties, such as wear resistance, friction reduction and corrosion resistance, but also made their presence felt in the field of surface-related functional materials, such as electromagnetism, optics, optoelectronics, thermology, superconductivity and biology. Surface engineering not only makes inexpensive metal materials in terms of performance and efficiency to play a greater advantage, and has become an important means of developing a variety of new plating and thin film materials, with great potential for application.

With the improvement of the machining industry, new requirements have been put forward for cutting tools. In addition to improving the service life also requires to reduce the pollution during cutting, as far as possible, the use of dry cutting. In the cutting fluid can not be completely canceled, try to do which contains only rust inhibitors and no organic matter, so that the cost of recycling can be greatly reduced.

The diversity of cutting tools and the use of the working condition of the characteristics of the decision to choose a different tool coating. Turning and drilling are different, and milling cutters should be considered for their intermittent impact characteristics. Early development of coatings to wear-resistant as the main focus, to improve the hardness of the main indicators. Titanium nitride as a representative of such coatings have a high coefficient of friction (0.4 ~ 0.6), processing and workpiece friction will generate a lot of heat energy. In order to avoid overheating and deformation of the tool to affect the machining accuracy and extend its service life, usually use cutting fluid.

To solve the problem of reducing or eliminating cutting fluid, the tool coating should not only make the tool have a long life, and should have a self-lubricating function. The emergence of diamond-like coating (DLC) in the machining of certain materials (Al, Ti and its composites) shows advantages, but after years of research shows that the diamond-like coating of high internal stress, poor thermal stability and catalytic effect with ferrous metals so that the SP3 structure to SP2 and other three shortcomings, determines it can only be applied to the processing of non-ferrous metals, thus restricting its further application in the The further application in machining is thus limited. However, the research in recent years shows that the hardness of SP2 structure-based diamond-like coating (also called graphite-like coating) can also reach 20-40GPa, but there is no problem of catalytic effect with ferrous metals, its coefficient of friction is very low and has good resistance to humidity, cutting can be used with coolant can also be used for dry cutting, and its life expectancy than the non-coated cutter has been doubled to improve the processing of iron and steel materials there is no problem, thus causing the coating company, tool manufacturers, and the cutting tool manufacturers to use SP3 structure to transform to SP2 structure and other three disadvantages. Thus, it has aroused the interest of coating companies and tool manufacturers. In time, this new type of diamond-like coating will be widely used in the cutting field.