Study on the various coated twist drills for stainless steels drilling

Titanium nitride (TiN) and titanium carbonitride (TiCN) hard coatings are used extensively in cutting tools because of their high hardness, wear resistance, and low coefficient of friction. The purpose of this paper is to experimentally investigate and compare the cutting force responses and drill life of twist drills with different coatings in the drilling of JIS SUS 304 stainless steel. The experimental results indicate that the TiN-surface multilayer coated drills have better cutting performance under the different drilling conditions. The effects of coating materials, coating layer, and drilling conditions on the cutting force responses and drill life are also discussed.