1. <br> <br> hardness of the coating of the high surface hardness is one of the best ways to improve the tool life. In general, the higher the hardness of the material or surface, the longer the life of the tool. Titanium Nitride (TiCN) coatings have higher hardness than Titanium Nitride (TiN) coatings. Due to the increased carbon content, the hardness of the TiCN coating is increased by 33%, and the hardness varies from about Hv 3000 to 4000 (depending on the manufacturer). The use of CVD diamond coatings with surface hardness up to Hv9000 is relatively mature on tools, and the lifetime of CVD diamond coated tools is 10 to 20 times higher than that of PVD coated tools. The high hardness and cutting speed of diamond coatings can be 2 to 3 times better than uncoated tools, making it a good choice for non-ferrous materials.
2. Wear <br> <br> wear resistance is the ability of a coating to resist wear. Although the hardness of some workpiece materials may not be too high, the elements added during the production process and the processes used may cause the cutting edges of the tool to crack or blunt.
3. The surface lubricity <br> <br> high coefficient of friction will increase to cutting heat, resulting in shortened life of the coating even failure. Lowering the coefficient of friction can greatly extend tool life. A smooth, smooth or textured coating surface helps reduce heat of cut because the smooth surface allows the chips to slide away from the rake face quickly and reduce heat generation. Compared to uncoated tools, coated tools with better surface lubricity can be machined at higher cutting speeds to further avoid high temperature welding with workpiece materials.
4. <br> <br> oxidation temperature oxidation temperature refers to the temperature value at the coating begins to decompose. The higher the oxidation temperature value, the more advantageous the cutting process under high temperature conditions. Although the TiAlN coating may have a lower room temperature hardness than the TiCN coating, it has proven to be much more effective than TiCN in high temperature processing. The reason why the TiAlN coating retains its hardness at high temperatures is the formation of a layer of alumina between the tool and the chip, which transfers heat from the tool to the workpiece or chip. Carbide tools typically have higher cutting speeds than high-speed steel tools, making TiAlN the preferred coating for carbide tools. Carbide drills and end mills typically use this PVD TiAlN coating.
The anti-adhesion coating <br> <br> blocking resistance can prevent or mitigate the tool and work material chemically react, to avoid material is deposited on the work tool. When machining non-ferrous metals (such as aluminum, brass, etc.), built-in chips (BUE) often occur on the tool, causing tool chipping or workpiece size. Once the material being processed begins to adhere to the tool, the adhesion will continue to expand. For example, when an aluminum workpiece is machined by a forming tap, the aluminum adhered to the tap increases after each hole is machined, and finally the diameter of the tap becomes too large, causing the workpiece size to be out of service. Coatings with good anti-blocking properties work well even in applications where the performance of the coolant is poor or the concentration is insufficient.
6. The cost of the tool allocated to the workpiece is low
Coated tools are slightly more expensive than uncoated tools. The average coated tool is about 1.2 times more expensive than uncoated tools, but its cutting performance is good, tool life is long, and the durability of coated tools is less than that of uncoated. The tool can be increased by 2 to 10 times, and can be used with a feed rate of 100-1000 higher than that of the uncoated tool and a cutting speed of 20% to 30%, and has the advantages of less tool change and power consumption. The cost of the tool to each workpiece is still much lower than that of the uncoated tool, so it should be preferred. However, the sharpness, impact toughness, anti-flaking and chipping resistance of coated tools are not as good as uncoated tools. Therefore, it is not used for small feed cutting and heavy roughing.
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