It is an important technology in the production and processing of the coatedcarbide cutting tools that it has important influence on the cutting performance, service life, surface quality, machining efficiency and machining precision. At present, the main process is to retreat back coating of TiN coated single component coating and (Ti, Al, Zr, Cr) N multi-component composite coating back coating, with the continuous development of coating technology, appearance and application of diamond coating,diamond coatings, nano coating and other new coating technology. Back coating technology needs continuous development to meet the new demand of industrial production. In this paper, the characteristics and research progress of the coating process are briefly introduced from two aspects of physical and chemical coating.

Back coating process: coating materials include nitrides, carbides, nitrides, oxides, boride, silicide, diamond and composite coating of eight categories of dozens of varieties. The most commonly used is single layer TiN coating, TiCN coating, TiAlN coating, CrN coating, DLC (DLC) coating and diamond coating, etc.. For different coating materials and structures, the coating process is not the same.

However, in practical application, there are two main types of physical and chemical coating.

Physical back coating: physical back coating refers to the use of mechanical methods to remove the film from the body, the physical back of the main methods of sand blasting, machining grinding, etc.. The utility model is suitable for the substrate which is not suitable to be immersed in the chemical solution, and has the advantages of low requirement for surface finish, low requirement on the dimensional precision, simple surface shape and easy grinding and polishing.

Chemical back coating: chemical coating refers to the dissolution of the carbide tool coating in the acidic or alkaline chemical solution, the solution of the coating and the alloy coating on the surface of thecarbidecutting tool. The solution needs to have contact and effect on compound membrane peeling off, the coating from the body relax time after the complex was separated from the matrix tool or workpiece, not attached in the tool body mixture of residue, recovery tool without coating before the original matrix. This method is commonly used in the coating of the coating method.

There are two kinds of chemical coating technology, chemical back coating and electrolytic coating. These two kinds of coating processes are based on the principle of chemical reaction.

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