Characteristics and scope of use of abrasives commonly used in abrasive belts

From the viewpoint of the abrasive properties of the material used for the manufacture of the abrasive belt, the chemical composition of the artificial abrasive is relatively stable, so the hardness is basically the same, the wear resistance and toughness are good, and the crystal configuration is relatively fixed, so that it is used more. Natural abrasives are different. Because they are naturally formed minerals, the temperature and pressure they are subjected to during the formation process are very inconsistent. For example, natural corundum, garnet, etc. are mainly used to manufacture general coated abrasives or only for Abrasive belts for processing wood, leather, etc.

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The different properties of the abrasive determine the range of processing it can be used for. Generally speaking, the material of the workpiece suitable for grinding abrasives is also applicable to the abrasive belt of the same kind of abrasive. That is, the workpiece with higher tensile strength is usually made of corundum abrasive with higher toughness; the workpiece with lower tensile strength is selected for brittleness and hardness. Higher silicon carbide abrasive. The harder the material of the workpiece, the higher the hardness of the abrasive belt.

The physical and chemical stability of the abrasive is also an important characteristic that determines the range of use of the abrasive, which is often not easy to attract attention. At present, the line speed of sanding has been developed to a high speed of 120m/s. Therefore, the abrasive grains and the surface of the workpiece will undergo a series of complicated physical and chemical reactions like grinding of the grinding wheel. For example, when machining cast iron, if sand with silicon carbide abrasive is used. With the belt, the processing result is not ideal, because the high temperature generated during the grinding process decomposes the SiC surface and produces a carbonized layer, which greatly accelerates the wear and tear of the silicon carbide abrasive. Therefore, the silicon carbide is not suitable for processing cast iron. In addition, when steel is processed with silicon carbide, high temperature is generated and chemical reaction occurs quickly, and the metal such as nickel, chromium, manganese and tungsten in the heat resistant alloy steel easily collides with the decomposition product of silicon carbide at high temperature. Used to form new compounds. Therefore, silicon carbide abrasives are not suitable for processing materials such as steel, heat resistant alloys, and stainless steel.

It is worth noting that with the development of industry, the variety, performance and quality of abrasives are constantly evolving. At present, the widely used artificial abrasives, such as alumina and silicon carbide, have poor abrasive properties and even wear out earlier than the substrates to which they are attached. As technology advances, alumina can be greatly improved in performance by heat treatment. Later, silicon carbide with a better lattice structure was fabricated. In 1972, an alumina-zirconia abrasive, particularly zirconium corundum or zirconium oxide sand, which was particularly resistant to crushing, appeared. Ceramic alumina was used in 1983, and then multiple ceramic aluminas were successfully developed. There have also been new developments in the external form of abrasives, such as hollow ball composite abrasives, cork composite abrasives, and the like. All of this has greatly improved the ability of abrasive belt abrasives in the various complex processing requirements of the city.

The emergence of zirconium corundum is a huge advancement of abrasive belt abrasives. It was invented by Norton Company of the United States and has a profound impact on heavy-duty abrasive belt grinding. It has high hardness, high toughness and strong wear resistance. When fractured, it can produce excellent comprehensive properties such as new cutting edges. Can be used in multiple metal processing. The abrasive belt made of zirconium corundum has a grinding efficiency of more than four times that of ordinary abrasive belts. The more zirconia corundum zirconia content, the better the grinding performance, which can be seen from Table 3. However, since zirconia is relatively expensive, the content is generally below 40%.

It is worth noting that with the development of industry, the variety, performance and quality of abrasives are constantly evolving. At present, the widely used artificial abrasives, such as alumina and silicon carbide, have poor abrasive properties and even wear out earlier than the substrates to which they are attached. As technology advances, alumina can be greatly improved in performance by heat treatment. Later, silicon carbide with a better lattice structure was fabricated. In 1972, an alumina-zirconia abrasive, particularly zirconium corundum or zirconium oxide sand, which was particularly resistant to crushing, appeared. Ceramic alumina was used in 1983, and then multiple ceramic aluminas were successfully developed. There have also been new developments in the external form of abrasives, such as hollow ball composite abrasives, cork composite abrasives, and the like. All of this has greatly improved the ability of abrasive belt abrasives in the various complex processing requirements of the city.

The emergence of zirconium corundum is a huge advancement of abrasive belt abrasives. It was invented by Norton Company of the United States and has a profound impact on heavy-duty abrasive belt grinding. It has high hardness, high toughness and strong wear resistance. When fractured, it can produce excellent comprehensive properties such as new cutting edges. Can be used in multiple metal processing. The abrasive belt made of zirconium corundum has a grinding efficiency of more than four times that of ordinary abrasive belts. The more zirconia corundum zirconia content, the better the grinding performance, which can be seen from Table 3. However, since zirconia is relatively expensive, the content is generally below 40%.