The microstructure of the abrasive tool has a great influence on the grinding performance. The grinding wheels of different tissues have different pores and the density of abrasive grains is also different. Therefore, even if the grinding tools have the same hardness but different microstructures, the grinding performance of the grinding wheels is different. When the structure of the abrasive tool is loose, the grinding efficiency is high, but the wear of the abrasive tool is too fast and the life is short; when the tissue is too tight, it is easy to burn the workpiece because it is difficult to accommodate the chips.
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When grinding materials with low hardness and high toughness, the abrasive tools are easily blocked by the wear debris, and it is necessary to use a loose abrasive material. The loosely ground abrasives allow the abrasive particles to cut into the workpiece to the maximum extent and carry away the thicker abrasive debris. When the rubber skin roller and the leather are ground by the air hole silicon carbide grinding wheel, the ceramic body or the body of the grinding radio ceramic component is ground, the workpiece heat can be avoided, the grinding efficiency can be improved, and a good effect can be obtained. When the root groove of the internal combustion engine blade is ground by the grinding process with slow penetration and large depth of cut, the micro-porous super-soft grinding wheel can also be used to obtain a good grinding effect.
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In the case of forming grinding and precision grinding, the structure of the grinding wheel should be selected to be tighter in order to maintain the formability of the working surface of the grinding wheel and obtain higher precision. When the contact area between the grinding wheel and the workpiece is large, or when the viscous and difficult-to-grind material is processed, the chip removal is difficult and the cooling condition is not good. To avoid overheating of the grinding area, a loose tissue grinding wheel is preferably used.
In the case of high-speed heavy-duty grinding of billets, in order to ensure sufficient strength and long life of the grinding wheel, the most closely organized grinding wheel is generally used. In order to ensure the geometry of the steel ball, a tightly organized grinding wheel is also used for grinding the steel ball.