Grinding wheel is an important abrasive in grinding. Grinding disc is a porous body made of rough, dried and roasted by adding binder to abrasive. Due to different abrasives, binders and manufacturing processes, the characteristics of grinding wheels vary greatly. It has an important impact on the processing quality, productivity and economy of grinding. The characteristics of the grinding wheel are mainly determined by factors such as abrasive, particle size, bond, hardness, structure, shape, and size.
Abrasives are the main raw materials for making grinding wheels, which are responsible for cutting work. Therefore, the abrasive must be sharp, with high hardness, heat resistance and toughness. Names, codes, properties and uses of commonly used abrasives.
The abrasive particle size is mainly related to the surface roughness and productivity. When rough grinding, the grinding allowance is large, and the required surface roughness value is large. Coarse grinding should be selected, because the grinding stone is coarse, the pores are large, the grinding depth may be large, and the grinding wheel is not easy Blockage or heat, small allowance during grinding, and low roughness value, so you can choose fine grinding. Generally speaking, the thinner the abrasive grains, the better the roughness of the grinding surface.
There are many kinds of grinding discs: the abrasives used include ordinary abrasives (corundum and silicon carbide, etc.) grinding discs, natural abrasive superhard abrasives, and (diamond and cubic boron nitride, etc.) wheels; It is a flat four-wheel film, a cylindrical four-wheel film, a cup-shaped four-wheel film, a four-sided four-wheel film, a dish-shaped four-wheel film, etc. According to different binders, it can be divided into ceramic grinding wheels, resin grinding wheels, rubber grinding discs, metal grinding wheels, etc. The characteristic parameters of grinding wheels mainly include abrasive, hardness, bonding agent, particle size, shape, size, etc.
The grinding disc generally works at high speed, so the rotation test (to ensure that the grinding wheel will not break at a high working speed) and the static balance test (to prevent machine vibration during work) must be carried out before use. Grinding performance and correct geometry require dressing.
The hardness of the grinding disc refers to the difficulty of the grinding teeth on the surface of the grinding wheel falling under the action of the grinding force. The hardness of the grinding wheel is soft, which means that the grinding head of the grinding disc is easy to fall off, and the hardness of the grinding disc is hard, and the grinding head is difficult to fall off. The hardness of the grinding disc and the hardness of the abrasive They are two different concepts. The same abrasive can be used to make grinding wheels with different hardness, which mainly depends on the performance and quantity of the bond and the process of making the grinding disc. The obvious difference between grinding and cutting is that the grinding wheel has “self-sharpening”. The hardness of the grinding disc is actually to choose the self-artifact of the four wheels. It is hoped that the sharp grinding stone will not fall off prematurely or become blunt.
The grinding wheel is a circular high-textured grinding ball with a central perforation made of abrasives and binders. The characteristics of the grinding wheel are determined by factors such as abrasives, particle size, hardness, bonding agent, shape, and size. What materials are used for the grinding wheel? Commonly used The abrasives are brown corundum (A) and white corundum (WA), followed by black silicon carbide (c) and green silicon carbide (GC), and the rest is chrome corundum (PA).