In the previous article, we mainly talk about the top two misunderstandings, let’s continued!

Tool coating

Diamond-coated tools have the advantages of high hardness, good wear resistance, and low friction coefficient. At this stage, the diamond coating is the best choice for graphite machining tools, and it can also best reflect the superior performance of graphite tools; The advantage of alloy cutting tools is that the hardness of a natural diamond is combined with the strength and fracture toughness of cemented carbide; however, the domestic diamond coating technology is still in its infancy, and the cost of investment is very large, so the diamond coating is in the near future. There will not be much development, but we can optimize the angle of the tool, select materials, etc., and improve the structure of the ordinary coating based on ordinary tools, which can be applied in graphite processing to a certain extent.

There is an essential difference between the geometric angles of diamond-coated tools and ordinary coated tools. Therefore, when designing diamond-coated tools, due to the particularity of graphite processing, the geometric angle can be appropriately enlarged, and the cutting grooves can also be enlarged, which will not Reduce the wear resistance of the cutting edge of the tool; for ordinary TiAlN coating, although the wear resistance of the uncoated tool is significantly improved, compared with the diamond coating, its geometric angle should be Properly put it small to increase its wear resistance.

For diamond coating, many coating companies in the world have invested a lot of manpower and material resources to research and development related coating technologies, but so far, foreign mature and economical coating companies are limited to Europe; This excellent graphite machining tool also uses the most advanced coating technology in the world to carry out surface treatment on the tool to ensure the machining life and at the same time ensure the economical and practicality of the tool.

Reinforcing the cutting edge

Tool edge passivation technology is a very important problem that has not been widely valued by people. The edge of the carbide tool sharpened by the diamond grinding wheel has different degrees of microscopic gaps (ie, microchipping and sawing). The performance and stability of graphite high-speed cutting tools put forward higher requirements, especially diamond-coated tools must be passivated before coating to ensure the firmness and service life of the coating. The purpose of tool passivation is to solve the above-mentioned defects of the microscopic gap of the tool edge after sharpening, so as to reduce or eliminate the edge value, so as to achieve the purpose of being smooth and smooth, sharp, strong and durable.

Machining conditions of the tool

Choosing the proper machining conditions has a considerable impact on the life of the tool.

• Cutting methods (climb milling and up milling), the cutting vibration during down milling is smaller than that of up milling. During down milling, the cutting thickness of the tool is reduced from the maximum to zero. After the tool cuts into the workpiece, there will be no bouncing knife phenomenon caused by the inability to cut chips. The rigidity of the processing system is good and the cutting vibration is small; during up milling, the cutting thickness of the tool From zero to the maximum, the tool will scratch a path on the surface of the workpiece due to the thin cutting thickness at the initial stage of cutting. At this time, if the cutting edge encounters hard points in the graphite material or chip particles remaining on the surface of the workpiece, it will cause the tool to break down. Flick or chatter, so the cutting vibration of up-cut milling is large;

• Blowing (or vacuuming) and immersing in EDM fluid processing, cleaning the graphite dust on the surface of the workpiece in time is conducive to reducing the secondary wear of the tool, prolonging the service life of the tool, and reducing the impact of graphite dust on the machine tool screw and guide rail. influences;

• Select the appropriate high speed and corresponding large feed.

Conclusion

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