The structure of the grinding tool has great influence on the grinding performance. The pores of grinding wheels with different structures are different, and the density of grinding grains is also different. Therefore, the grinding performance of the grinding wheel is different even if the hardness of the grinding tool is the same but the structure is different. When the structure of the grinding tool is loose, the grinding efficiency is high, but the wear of the tool is too fast and the life is short; When the tissue is too tight, it is difficult to contain the chip and burns the workpiece.

When grinding the material with low hardness and large toughness, the abrasive tool is easy to be blocked by the grinding chips, so it is necessary to use the abrasive tool with loose structure. Loose abrasive tools allow abrasive particles to cut into the workpiece to the maximum extent possible and carry away the thicker abrasive particles. When grinding rubber roller and leather with big porous silicon carbide grinding wheel, grinding the blank body of ceramic or radio ceramic components, it can not only avoid the workpiece heating, but also improve the grinding efficiency and obtain better results. When the root groove of internal combustion engine blade is ground with slow feed and deep cut, the ultra-soft grinding wheel with micro pores can also get good grinding effect.

In the process of forming grinding and precision grinding, the structure of the grinding wheel should be selected closely so as to maintain the formability of the working surface of the grinding wheel and obtain higher precision. When the grinding wheel has a large contact area with the workpiece, or when the processing of sticky materials is difficult, it is difficult to remove chips and the cooling conditions are not good. In order to avoid overheating of the grinding area, it is advisable to use a loose grinding wheel.

In order to ensure sufficient strength and long service life of the wheel, the wheel with the most compact structure is generally used when grinding billets at high speed and heavy load. In order to ensure the geometry of the steel ball, the grinding wheel with tight structure is also used.