In recent years, with the increasing application range of superhard materials such as diamond and cubic boron nitride, the market competition has become increasingly fierce. Grinding is essentially a process in which a large number of abrasive particles randomly distributed on the surface of the grinding wheel proceed cutting process. Due to the extremely high hardness and wear resistance of superhard materials such as diamond and cubic boron nitride, the grinding mechanism is quite different from that of general metal materials. Studying the consumption mechanism of diamond grinding wheel in the process of grinding superhard materials has guiding significance for the rational selection and use of diamond grinding wheel. Glory Diamond Tools could offer grinding wheels like 6A2 grinding wheel, 11A2 grinding wheel, etc.
Under the condition of low grinding force and grinding speed, after the diamond grinding wheel is used, a large number of attrition facets with sharp edges of diamond abrasive are distributed on the surface. This is because of the mechanical wear caused by the diamond abrasive particles and the mechanical friction of the superhard material. This wear is progressive, and the wear amount of the abrasive particles is proportional to the length of the grinding stroke. Under the high grinding conditions of the grinding zone, the diamond abrasive grains on the diamond grinding wheel are oxidized and graphitized. According to the nature of the diamond, the degree of oxidation and graphitization depends on the crystal integrity of the diamond abrasive, and the degree of graphitization is also related to the crystal orientation. Diamond abrasives with good crystal integrity has low degree of oxidation and graphitization loss. Part of the diamond abrasive grains on the surface of the diamond grinding wheel are partially broken so that the whole grains fall off.
The choice of abrasive grain size of diamond grinding wheel directly affects the surface quality and processing efficiency of superhard material grinding. Under the premise of meeting the processing quality requirements, try to choose coarser particle size to improve processing efficiency. For rough grinding, 120#-150# grain size abrasives can be used, and 180#-240# grain size abrasives can be used for fine grinding. The concentration of the abrasives in the diamond wheel has a certain influence on the grinding effect of the super-hard material. Too high or too low concentration will cause premature falling off of the abrasive, which will increase the cost of grinding wheel loss. The experimental results show that higher concentration can be selected to increase the number of effective abrasive grains per unit area during coarse grinding. However, low concentration can be selected for processing efficiency improvement of fine grinding. Under normal circumstances, the abrasive concentration can be selected from 100% to 150% during rough grinding, and from 75% to 100% for fine grinding. The metal bond abrasive particles with good thermal conductivity have large bonding force, which are suitable for relatively high grinding ratio of the diamond crystal with relatively complete crystal form. The resin bond has weak adhesion to abrasive grains and is suitable for diamond abrasives with high brittleness and low strength. The performance of the ceramic bond is between the above two.