Tool coating technology since the advent of the improvement of tool performance and processing technology plays a very important role in the coating technology will be coated with a layer of traditional film, the tool performance has undergone tremendous changes. The main coating materials are: Tic, TiN, Ti (C, N), TiALN, ALTiN and so on. Coating technology has been used in end mills, reamers, drill bits, composite hole machining tools, gear hobs, shaper shaper, shaving cutter, forming broach and various machine holder indexable inserts to meet high-speed machining Strength, high hardness cast iron (steel), forged steel, stainless steel, titanium alloy, nickel alloy, magnesium alloy, aluminum alloy, powder metallurgy, non-metallic materials such as the production of different requirements of the workpiece.