One of the important properties of an abrasive is its hardness, which must be harder than the material to be processed. A Mohs hardness tester is commonly used to determine the hardness of various abrasives. Another important property of abrasives is toughness or bulk strength. The mixing amount, purity, particle size and crystal structure of the raw materials can be changed to control this performance to suit various applications.
In the manufacture of abrasive products, all raw materials except powdered talc and iron oxide need to be crushed and sieved. The sieving particle size should be 4 to 900, that is, the diameter is about 6 mm (mm) to 6 microns (thousandths of 1 mm). One) or more detailed. Grinding wheel is the most important abrasive product. It is made by mixing abrasive and bonding agent in a certain proportion, and sintering after molding. Finally, it must undergo shaping, balance and overspeed tests. Emery cloth and sandpaper are another kind of abrasive products with larger output. They are made of abrasive grains bonded to the base material (cloth or paper), dried and cut into products of different specifications. Others are powdery or granular abrasives. After screening, they need to be processed by certain processes, such as abrasives for grinding or polishing, usually with mineral oil or wax and other auxiliary materials to meet the needs of different working conditions.