Several reasons affecting tool wear (2)

There is a fundamental difference between the geometric angle of the diamond coated tool and the ordinary coated tool. Therefore, when designing the diamond coated tool, due to the particularity of graphite processing, the geometric angle can be appropriately enlarged, and the groove can be enlarged. Reduces the wear resistance of the tool front; for ordinary TiAlN coatings, although the wear resistance is significantly improved compared to uncoated tools, it is geometrical when machining graphite compared to diamond coatings. It should be appropriately small to increase its wear resistance.

For diamond coatings, many coating companies in the world have invested a lot of manpower and material resources to research and develop related coating technologies, but so far, mature and economical coating companies abroad are limited to Europe; PARA as a The excellent graphite processing tool also uses the world's most advanced coating technology to surface the tool to ensure the processing life and ensure the economical and practical tool.

4, the reinforcement of the cutting edge

Tool edge passivation technology is a problem that has not been widely recognized and is very important. The edge of the carbide cutter after sharpening of the diamond wheel has microscopic notches of different degrees (ie, micro chipping and sawing). Graphite high-speed cutting tool performance and stability put forward higher requirements, especially diamond coating tools must be passivated by the knife edge before coating to ensure the firmness and service life of the coating. The purpose of tool passivation is to solve the defect of the micro-notch of the cutting edge of the above-mentioned sharpened blade, so that the front value is reduced or eliminated, and the smoothness and rigidity are achieved.

5, the machining conditions of the tool

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

(1) Cutting method (shun milling and up milling), the cutting vibration during down milling is smaller than the cutting vibration of up milling. The cutting thickness of the tool during down-cutting is reduced from the maximum to zero. After the tool is cut into the workpiece, there is no knives caused by cutting the chip. The rigidity of the process system is good and the cutting vibration is small. When cutting the thickness of the tool during the reverse milling From zero to maximum, the cutting edge will be scratched on the surface of the workpiece due to the thin cutting thickness. At this time, if the cutting edge encounters hard spots in the graphite material or chip particles remaining on the surface of the workpiece, it will cause the tool. The knives or flutter, so the cutting vibration of the up-cut milling is large;

(2) Blowing (or vacuuming) and impregnating EDM liquid processing, timely cleaning the graphite dust on the surface of the workpiece, which is beneficial to reduce the secondary wear of the tool, prolong the service life of the tool, and reduce the graphite dust on the screw and guide rail of the machine tool. influences;

(3) Select the appropriate high speed and the corresponding large feed.

In summary of the above points, the material of the tool, the geometric angle, the coating, the reinforcement of the cutting edge and the machining conditions play different roles in the service life of the tool, which are indispensable and complementary. A good graphite tool should have a smooth graphite powder chip flute, long service life, deep engraving processing, and can save processing costs.

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