The choice of abrasives mainly depends on the material of the workpiece and the heat treatment method.
a. When grinding materials with high tensile strength, use abrasives with high toughness.
b. For materials with low grinding hardness and large elongation, use more brittle abrasives.
c. When grinding hard materials, use harder abrasives.
d. Use abrasives that are not prone to chemical reactions in 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 other commonly used are chromium corundum (PA) and single crystal corundum (SA). , Microcrystalline corundum (MA), zirconium corundum (ZA).
Brown corundum grinding wheel: Brown corundum has high hardness and toughness, and is suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable cast iron, hard bronze, etc. This abrasive has good grinding performance and wide adaptability. It is often used for rough grinding with a large margin. It is cheap and can be widely used.
White corundum grinding wheel: The hardness of white corundum is slightly higher than that of brown corundum, and the toughness is lower than that of brown corundum. During grinding, the abrasive grains are easily broken. Therefore, the grinding heat is small, and it is suitable for manufacturing precision-hardened steel, high carbon steel, High-speed steel and grinding wheels for grinding thin-walled parts cost more than brown corundum.
Black Silicon Carbide Wheel: Black silicon carbide is brittle and sharp, with higher hardness than white corundum, suitable for grinding materials with low mechanical strength, such as cast iron, brass, aluminum and refractory materials.
Green silicon carbide grinding wheel: Green silicon carbide has higher hardness and brittleness than black silicon carbide, sharp abrasive particles and good thermal conductivity. It is suitable for grinding hard and brittle materials such as cemented carbide, optical glass and ceramics.
Chrome corundum grinding wheel: suitable for grinding workpieces with high surface processing quality such as cutting tools, measuring tools, instruments and threads.
Single crystal corundum grinding wheel: suitable for grinding stainless steel, high-vanadium high-speed steel and other materials with high toughness and high hardness and workpieces that are easy to deform and burn.
