In the grinding of diamond grinding wheel, its hardness is very important, and the impact on the grinding wheel is relatively large. The hardness of the diamond grinding wheel refers to the difficulty of falling the abrasive grain from the surface of the grinding wheel under the effect of the grinding force. The scientific expression of hardness is: the ability of a substance to resist the marking or pressing of other objects into its surface, and can also be understood as the energy required to produce local deformation on a solid surface. So, what are the factors affecting the hardness of the diamond wheel? How can we avoid these problems?
The impact of the hardness of the diamond wheel needs to be treated correctly.
1. The metal bond formed by the combination of electrons between metal atoms, because the bonding force is relatively weak, the hardness of the metal material is generally moderately low, and the harder the workpiece, the softer the grinding wheel.
2. When grinding and forming grinding, a harder grinding wheel should be selected to adhere to the necessary shape accuracy of the grinding wheel;
3. The selection of the hardness of the grinding wheel and the size of the grain: the grinding wheel with larger grain size, in order to prevent the grinding wheel from being blocked by the grinding debris, it is usually necessary to select a softer grinding wheel;
4. Selection and application range of grinding wheel size: 12~15#: Grinding wheel grinding tools for rough grinding, rough grinding and grinding burrs. 20~#: Grinding tools for grinding steel ingots, grinding casting burrs, grinding porcelain and refractory materials;
5. The molecular bond formed by the combination of molecular attraction between the mass points, because the binding force is the weakest, the hardness of the molecular crystal is also the smallest, such as graphite, talc, kaolinite and the like. According to the different hardness measurement methods, it can be expressed as scoring hardness, microhardness, grinding hardness, etc. The value varies with the measurement method, but the variation law has similarity, which shows that the hardness is larger and the value is larger. Therefore, when grinding soft materials such as non-ferrous metals, rubber, and resins, a softer grinding wheel should be used.
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