1. Abrasive selection The choice of abrasive depends mainly on the workpiece material and the heat treatment method. a. When grinding materials with high tensile strength, use abrasives with high toughness. b. When grinding materials with low hardness and high elongation, use brittle abrasives. c. When grinding high hardness materials, use a higher hardness abrasive. d. Use abrasives that are not susceptible to chemical reactions by the material being processed. The most commonly used abrasives are brown corundum (A) and white corundum (WA), followed by black silicon carbide (C) and green silicon carbide (GC). The rest are also commonly used in chrome corundum (PA) and single crystal corundum (SA). , microcrystalline corundum (MA), zirconium corundum (ZA). 125*1*22 EN12413 cutting disc: brown corundum has high hardness and high toughness. It is suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable iron, hard bronze, etc. This kind of abrasive has good grinding performance and wide adaptability. It is often used to remove a large amount of coarse grinding, which is cheap and can be widely used. White corundum cutting piece: The hardness of white corundum is slightly higher than that of brown corundum, and the toughness is lower than that of brown corundum. When grinding, the abrasive grains are easily broken. Therefore, the grinding heat is small, and it is suitable for manufacturing refined hardened steel and high carbon steel. High-speed steel and flat cutting disc on sale for grinding thin-walled parts are more expensive than brown corundum. Black silicon carbide cutting sheet: Black silicon carbide is brittle and sharp, and its hardness is higher than that of white corundum. It is suitable for grinding materials with low mechanical strength, such as cast iron, brass, aluminum and refractory materials. Green silicon carbide cutting piece: Green silicon carbide has higher hardness and brittleness than black silicon carbide, sharp abrasive grain and good thermal conductivity. It is suitable for grinding hard and brittle materials such as hard alloy, optical glass and ceramics. Chrome corundum cutting piece: suitable for grinding tools, measuring tools, instruments, threads and other workpieces with high surface quality requirements. Single crystal corundum cutting piece: suitable for grinding stainless steel, high vanadium high speed steel and other materials with high toughness, high hardness and easily deformed burn. Microcrystalline corundum cutting sheet: suitable for grinding stainless steel, bearing steel and special ductile iron, etc., used for forming grinding, cutting grinding, mirror grinding. Zirconium corundum cutting sheet: suitable for grinding Austrian stainless steel, titanium alloy, heat resistant alloy, especially suitable for heavy-duty grinding. The choice of particle size depends primarily on the surface roughness and grinding efficiency of the workpiece being ground. Particle size refers to the particle size of the abrasive and its size is indicated by the particle size number (see Table 1).