【概要描述】Diamond tool sharpening process method is the key to obtain diamond tools with sharp edge, small surface roughness value and small edge serrations. Currently seen in the literature of diamond tool sharpening process methods are the following 5 kinds 1、Mechanical grinding method The traditional mechanical grinding method generally in the diameter of 30 ~ 40cm cast iron grinding disc coated with a layer of mixed size 1 ~ 50 Λ m diamond powder grinding paste for pre-grinding, so that the diamond powder embedded in the cast iron grinding disc microporous, and then using 50r/min typical speed to diamond tool grinding, its essence is the diamond and diamond grinding. The traditional mechanical grinding method has high grinding efficiency because of the high speed of grinding disc, high positive pressure and high friction force during grinding. However, due to the discontinuous impact effect of this grinding method, the diamond tool serrations and the thickness of the metamorphic layer are larger, and the surface roughness value is also larger, generally 0.05 ~ 1μm. According to foreign literature, when the diamond tool cutting edge blunt circle radius reaches the nanometer level, can use the diamond tool and grinding disc spacing for tens of nanometers zero load idle, this case can also remove the tool material. So in theory, the mechanical polishing method can make the surface roughness value of several nanometers. 2, ion beam sputtering method Ion beam sputtering method is the use of high-energy argon ion bombardment of diamond tool surface carbon atoms, so that the tool carbon atoms are excluded one by one microfabrication method, suitable for processing tiny diamond tools, the obtained diamond tool surface roughness value of a few nanometers. 3、Thermal chemical polishing method Thermochemical polishing method is generally in the flow of hydrogen in the carbon atoms and the surrounding hydrogen gas reaction to generate methane and with the air flow out. Thermochemical polishing efficiency depends on the diffusion rate of carbon atoms, and the influencing factors are temperature, positive pressure, grinding disc speed, etc. This method can make the diamond tool surface roughness value (Ra) reach several nanometers, and the surface metamorphic layer is shallow. 4、No damage mechanical chemical polishing method This method in the NaOH solution to add an appropriate amount of microfine diamond powder and more fine silicon powder, through the strong electrostatic effect to make silicon powder adsorption in the diamond powder above, and then they coated in porous system cast iron grinding disc on the diamond tool grinding, the essence is microfine silicon powder and diamond tool surface carbon atoms occur chemical reaction, through the silicon micro powder micro grinding effect to scrape off the reaction layer. The grinding efficiency of this method is very low, about one atomic layer per minute. 5、Oxidation etching method This method uses high purity oxygen or oxygenated water vapor to make the carbon atoms on the diamond surface oxidize under the action of high temperature (pure oxygen 1100℃, oxygenated water vapor 600～900℃) to form carbon oxides and discharge with the oxygen or water vapor stream. The roughness value (Ra) of the diamond surface after processing by this method can reach several nanometers.