What principles should be followed when choosing abrasives?

           Abrasive is a very important material for abrasive tools, which is directly related to the quality and use effect of abrasive products. Therefore, there are certain principles that need to be followed when selecting. What specific principles should be followed?

           If grinding materials with high tensile strength, it is beneficial to choose corundum abrasives with greater toughness. When grinding materials with low tensile strength, it is beneficial to use silicon carbide abrasives with greater brittleness.

           In addition to considering the tensile strength of the workpiece material, the hardness of the workpiece material is also the main selection basis when selecting abrasives. Generally speaking, the hardness of the abrasive should be more than 2-4 times higher than the hardness of the workpiece material. Otherwise, the lower hardness abrasive grains will quickly passivate and lose their cutting ability during high-speed cutting, making the grinding wheel durability too low and affecting the cutting. efficiency, and processing quality cannot be guaranteed. Therefore, the harder the workpiece material is, the harder the abrasive should be.

           The selection of abrasive properties should also take into account possible chemical reactions in the grinding process system. In the grinding contact area, abrasives, binders, workpiece materials, grinding fluids and air are prone to spontaneous chemical reactions under the catalytic action of grinding temperature and grinding force. Tests have proven that silicon carbide grinding tools When grinding steel, the abrasive wear is faster than when corundum abrasive is grinding steel. The main reason is the strong chemical reaction between silicon carbide abrasive and steel.

           In addition, when selecting abrasives, the thermal stability of the abrasives should also be considered. When grinding some difficult-to-grind materials, when the grinding area is prone to higher temperatures, the abrasives used should have better high-temperature hardness retention.

           Abrasive products made of different abrasives are definitely different, because the usage characteristics of abrasives are quite different, including hardness, wear resistance, etc. Specific abrasive products can be selected based on specific circumstances.