Tool production process:

Coating technology

The coating of the tool is a big change on the way forward in the machining industry, it is in the matrix of the tool toughness is high coated with a layer, two layers or even multiple layers of high hardness, high wear resistance, high temperature material thin layer (such as TiN, TiC, etc.), so that the tool has a comprehensive, good comprehensive performance. The hardness of uncoated high-speed steel is only 62~68HRC (760~960HV), and the hardness of cemented carbide is only 89~93.5HRA (1300~1850HV); The surface hardness of the coating can reach more than 2000~3000HV. In industrial production, the use of coated tools can improve processing efficiency, processing accuracy, extend life and reduce costs. In the past 30 years, tool coating technology has developed rapidly, and coated tools have been widely used. Coated high-speed steel tools and coated carbide tools have accounted for more than 50% of the total number of tools used. In Western Europe, due to the lack of resources and the efficiency of machining, as well as the advancement of numerical control technology and the increase of difficult-to-process materials, coating tools are moving forward passively at an alarming rate of development. The proportion of coated tools used in Western industrial developed countries has risen from 26% in 1978 to 90% in 2005, and about 80% of the tools used in new CNC machine tools are coated tools. [1]

Advantages of coating tools:

Because the surface coating material has high hardness and wear resistance, and high temperature resistance. Therefore, compared with uncoated tools, coated tools allow a higher cutting speed, thereby improving the cutting efficiency; Or it can improve tool life at the same cutting speed. Because the friction coefficient between the coated material and the material to be machined is small, the cutting force of the coated tool is less than that of the uncoated tool. The quality of the machined surface of the parts is better when the coating tool is used. Due to the good comprehensive performance of the coated cutting tool, the coated carbide blade has better versatility, and a coated carbide blade has a relatively wide range of use. There is still a big gap between China's tool coating technology and industrial developed countries, and the number of coated tools is also far away, accounting for roughly 20% of all tools. Among them, CNC machine tools and machining centers are mostly used, and ordinary non-CNC machine tools are quite few, mainly affected by factors such as awareness problems and prices. Therefore, in China, the development and application of tool coating technology has a lot of potential room for improvement.

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