In the case of constant cutting parameters, in order to improve production efficiency and reduce production costs, the tool coating technology to reduce tool wear, and in order to improve tool durability has become a trend.
Tool coating refers to coating a thin layer of refractory metals or non-metallic compounds with good wear resistance on the surface of cemented carbide or high speed steel (HSS) with good strength and toughness by vapor deposition. As a chemical barrier and thermal barrier, the coating reduces the diffusion and chemical reaction between the tool and the workpiece, thus reducing the wear of the tool. Coated cutting tools have the characteristics of high surface hardness, good wear resistance, stable chemical performance, heat resistance and oxidation resistance, small friction coefficient and low thermal conductivity.
After coating, the number of bits processed has been significantly increased, and the cost of individual parts has been greatly reduced.
If a coated drill bit needs to be repaired after wear, the coating on the surface of the bit can not be repaired and will be worn off by a drill bit grinder.