High-speed cutting performance of new TiAlN coated milling cutters (3)

AlSi H13/JIS SKD61 die steel material (52HRC) was machined by arc milling with a VC-MD model TiAlN coated end mill (Ï†12mm) (groove depth 10mm) (milling speed: 313m/min (8300r/min); Feeding speed: 5000mm/mi (0.10mm/tooth); air-cooled). The milling parameters and processing results when machining grooves with widths of 18mm, 16mm and 15mm are shown in Table 2.

Table 2 Arc milling slot milling parameters and machining results

Milling parameters:

t(mm): 18,16,15

Rd(mm): 0.6, 0.3, 0.27

X (mm): 1.74, 1.48, 0.89

Î¸: 44.8Â°, 41.0Â°, 31.5Â° slot length (m): 0.26, 0.33, 0.35

Processing effect:

Milling length (m): 24, 28, 33

Blade wear amount: larger, smaller, smaller

It can be seen from Table 2 that the radial depth of cut Rd has a great influence on the tool wear during arc milling, and the larger the Rd, the more obvious the blade wear. The advantages of circular milling slots are large axial depth of cut, reduced milling forces, reduced mechanical vibration, and increased milling endurance.

(2) spiral milling hole

Machining holes in a spiral milling process with TiAlN coated ball end mills results in higher machining efficiency and longer tool life. Milling and milling of AlSi H13 / JIS SKD61 die steel material (52HRC) workpiece with VC-2MB R3 TiAlN coated spherical milling cutter (hole depth: 9mm; X, Y feed rate: 1500mm/min; milling speed : 283m / min, equivalent to 15000r / min), the relationship between the diameter of the machined hole and the axial feed rate of the helical milling (the amount of axial movement of the spiral advance) Fa shows that the value of Fa can be processed when the value is small. Larger aperture. When the machined hole diameter is Ï†9 mm, the maximum value of Fa is 0.6 mm. If the value exceeds this value, the wear of the milling cutter will be intensified. The relationship between the number of milling holes and the wear of the milling cutter when machining the Ï†7mm aperture with the axial feed rate Fa=0.3mm shows that the flank wear of the 100 holes is about 0.03mm, and the flank of the 500 holes is milled. The wear amount is about 0.05mm. It can be seen that with the increase of the number of milling holes, the wear amount of TiAlN coated milling cutter does not change much, and its durability is high.

6. Conclusion

The TiAlN coating has better mechanical and physical properties than the coatings of TiC, TiN, TiCN, etc., and can be combined with other coatings to form a multi-layer composite coating. The cutting test and processing practice show that the TiAlN coated tool has good chemical stability and strong anti-oxidation and wear resistance. When processing high-alloy steel, stainless steel, titanium alloy, nickel alloy and other difficult-to-machine materials, its working life can be improved compared with TiN coated tools. 3 to 4 times. The TiAlN coating has a high Al concentration, and a very thin amorphous Al2O3 is formed on the surface of the coating during cutting to form a hard inert protective film, which is very suitable for high-speed machining. The popularization of TiAlN coated tools will greatly improve tool durability, reduce machining assistance time, reduce cutting and processing costs, and improve enterprise economic efficiency.

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