The application of dry milling technology has completely eliminated the pollution of cutting fluid in machining. However, dry milling sets very high requirements on milling process and milling cutters, which has become the bottleneck in the popularization of dry milling technology. This research on the abrasion mechanism of TiAlN coated cutters for high-speed dry milling has indicated that, in high-speed dry milling, the abrasion of coated cutter is mainly in the form of crater. TiAlN coating has very strong oxidation resistance and adhesion resistance, so that the cutters have good abrasion resistance and crater abrasion resistance. In high-speed dry milling, a very thin layer of amorphous Al2O3 will be formed on the surface of TiAlN coating, forming hard inert protection film that acts as a good heat barrier. TiAlN coating has a low friction coefficient, which can effectively reduce the cutting force and cutting temperature, thus greatly prolonging the life of cutter. As an emerging coated cutter, TiAlN coated cutters exhibit incomparable excellent performance in high-speed dry milling. The research shows that factors such as coating thickness, milling speed, chip thickness and cutter conditions have important impact on the abrasion of TiAlN coated cutters.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.