Abstract: The problem of short service life of coated tools is prominent in high-speed cutting of TC4 (Ti6-Al4-V). The surface integrity of coated tools can be improved by surface post-treatment which is an effective way to improve the service life of coated tool. Experiment in high-speed dry cutting of titanium alloy is conducted with TiAlN coated tool which is post treatment by wet micro-blasting to reveal the influence of micro-blasting on surface micro morphology, roughness, micro hardness and residual stress. High-speed dry cutting tests are carried out to study the influence of micro-blasting on coated tool life and wear mechanism. The result indicates that the appropriate blasting process (water and particles mixed, wet micro-blasting, blasting pressure is 0.1—0.5 MPa, blasting time is 0—10 s, particle is Al2O3or ZrO2) can remove large particles, bumps and other micro defects of the coating surface to improve the surface morphology. However, too high blasting parameters has a significantly reduce tool life in machining, especially in high-speed cutting. The blasting particles and time mainly affect the removal of coating materials, and change the surface morphology, roughness and residual stress. The blasting pressure mainly affects the impact of particles, and improve the surface hardness and residual compressive stress. Compared with untreated tool, the surface integrity of treated tool improves obviously, the duration of stable wear stage is prolonged and the tool life can be increased by 50%.
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2021, Vol. 35 
