A grinding wheel is a cutting tool for grinding. It is a porous object made of many small, hard particles and binder. The abrasive particles directly bear the cutting work, must be sharp and have high hardness, heat resistance and toughness. The commonly used abrasives are alumina (also known as corundum) and silicon carbide. Alumina type abrasive high hardness, good toughness, suitable for grinding steel. Silicon carbide abrasive has higher hardness, sharper, good thermal conductivity, but more brittle, suitable for grinding cast iron and hard alloy.

Grinding wheels with the same abrasive material have different surface roughness and processing efficiency due to their different thickness. Coarse abrasive grains are used for rough grinding, while fine abrasive grains are suitable for fine grinding. The coarser the abrasive, the smaller the particle size.

The binder ACTS as a binding abrasive. Commonly used is ceramic binder, followed by resin binder. Different binder materials affect the abrasion resistance, strength, heat resistance and toughness of the grinding wheel.

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The stronger the bond, the less likely it is to fall off the grinding wheel. This is called the hardness of the grinding wheel, that is, the hardness of the grinding wheel refers to the degree of difficulty for the grinding grains on the surface of the grinding wheel to fall off under the action of external forces. Easy to fall off is called soft, and vice versa. The hardness of grinding wheel and the hardness of abrasive are two different concepts. The surface of the workpiece is soft, and the edge (edges and corners) of the grinding grains are not easy to wear, so the grinding grains can be used for a longer time, that is to say, it is optional to stick the grinding wheel with a stronger hardness (the grinding wheel with a higher hardness). Conversely, low hardness grinding wheel is suitable for grinding high hardness workpiece.

The grinding wheel works at high speed. In order to ensure safety, it should be inspected before installation without any defects such as cracks. In order to make the grinding wheel work smoothly, the operation balance test should be carried out before use.

After the grinding wheel works for a certain period of time, the surface gap will be blocked by grinding debris, the sharp Angle of abrasive will be blunt, and the original geometric shape will be distorted. Trimming is therefore necessary to restore cutting power and correct geometry. The grinding wheel needs to be trimmed with diamond pen