Analysis of Wear Mechanism of TiSiN/TiAlN Coated Cutting Tools in High-speed Turning TC4 Titanium Alloy
The wear mechanism of the double-layer TiSiN/TiAlN coated tool in turning TC4 titanium alloy is studied.The wear morphology of the tool is observed by scanning electron microscope.The wear zone of the rake face of the coated tool is divided into dead zone,sticking zone and sliding zone.The wear mechanism of the three wear zones is different.There is almost no wear in the dead zone.In the sticking zone,the coating failure is affected by high temperature and high pres-sure.In the sliding zone,the coating failure is caused by the chip sliding friction on the rake face.The cutting force is ob-tained through the dynamometer.The results indicate that at low feed rate,the resistance and feed force are bigger than the main cutting force,which is affected by the rebound of the machined surface.The temperature of the free surface of the chip is obtained by the infrared thermal imager.The results indicate that the chip thickness increases with the increase of the feed rate,resulting in no increase in chip free surface temperature.
TC4 titanium alloycoated toolwear mechanismcutting forcechip temperature
万方数据
维普
