Definition Of Grinding Wheel And Explanation Of Hardness
Grinding Wheel is the most important type of abrasive in grinding. The grinding wheel is a porous body made by adding a binder to the abrasive, by pressing the billet, drying and roasting. Because of the different abrasive, binder and manufacturing processes, the characteristics of the grinding wheel vary greatly, so it has important influence on the machining quality, productivity and economy. The characteristics of grinding wheel are mainly determined by the factors such as abrasive, particle size, binder, hardness, microstructure, shape and size.Grinding wheel
According to the shape can be divided into flat-shaped grinding wheel, bevel wheel, cylindrical grinding wheel, cup-shaped grinding wheel, disc-shaped grinding wheel, etc. according to the binder can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel and so on. The characteristic parameters of the grinding wheel are abrasive, particle size, hardness, binder, shape, size and so on. Since the grinding wheel usually works at high speed, the rotary test should be carried out before use (to ensure that the grinding wheel will not rupture under the maximum working speed) and the static balance test (to prevent the vibration of the machine when the work is caused). After working for a period of time, the grinding wheel should be trimmed to restore the grinding performance and the correct geometrical shape.Grinding wheel
The hardness of the grinding wheel refers to the difficulty of peeling off the abrasive grains on the surface of the grinding wheel under the action of grinding force. The hardness of the grinding wheel is soft, which indicates that the abrasive grains of the grinding wheel are easy to fall off and the hardness of the grinding wheel is hard to fall off. The hardness of the grinding wheel and the hardness of the abrasive are two different concepts. The same abrasive can be made of different hardness of the grinding wheel, it mainly depends on the performance of the binder, quantity and grinding wheel manufacturing process. The remarkable difference between grinding and cutting is that the grinding wheel has "self sharpness" and the hardness of the grinding wheel, in fact, is the choice of the grinding wheel's own sharpness, hope that the sharp abrasive particles do not fall off too early, also do not wear blunt not to fall off.
The structure of the grinding wheel refers to the proportion of the volume of the grinding grains, the binder and the stomata. The percentage of the abrasive wheel volume is usually graded. The grinding wheel has three kinds of organization states: Compact, Medium, loose, divided into 0-14, a total of 15 levels. The smaller the organization number, the larger the proportion of abrasive grains, the closer the grinding wheel is, and conversely, the larger the organization number, the smaller the abrasive ratio, the looser the grinding wheel.Grinding wheel