Abrasives occupy a very important position in industrial production, today we want to bring you some relevant knowledge about abrasives!
Common abrasive solidified abrasives are abrasives with a certain shape and strength, which are cemented by the bonding agent. It is generally composed of abrasives, bonding agent and pores, which are often called the three elements of solidified abrasives.
Abrasives play a cutting role in abrasives. The bonding agent is the material that solidifies the loose abrasive into the abrasive, there are two types of inorganic and organic. Inorganic bonding agents include ceramics, rhodochrosite and sodium silicate; organic ones include resin, rubber and insect glue. The most commonly used of these are ceramic, resin and rubber bonding agents.
The pores are used to hold and discharge chips during grinding and to accommodate coolant, which helps to dissipate the grinding heat. To meet certain special processing requirements, the pores can also be impregnated with certain fillers, such as sulphur and paraffin, to improve the performance of the abrasive. This filler is also known as the fourth element of the abrasive.
The items that indicate the characteristics of common abrasive solidified abrasives are: shape, size abrasive, grain size, hardness, organisation, backing fluff, backing and bonding agent. Abrasive hardness refers to the ease with which abrasive grains can be dislodged from the surface of the abrasive under external forces, and it reflects the strength of the bonding agent holding the abrasive grains.
The hardness of the abrasive depends mainly on the amount of bonding agent added and the density of the abrasive. The ease of shedding of abrasive grains indicates a low hardness of the abrasive; conversely, it indicates a high hardness. The grades of hardness are generally divided into seven grades: super soft, soft, medium soft, medium, medium hard, hard and super hard, from which several smaller grades can be subdivided. The more commonly used methods for determining the hardness of abrasives are the hand cone method, the mechanical cone method, the Rockwell hardness tester method and the sandblast hardness tester method.
The hardness of a grinding tool corresponds to its dynamic modulus of elasticity, which facilitates the determination of the dynamic modulus of elasticity of the grinding tool by the audio method to indicate the hardness of the grinding tool. In the grinding process, if the workpiece to be ground has a high material hardness, a low hardness abrasive is generally used; conversely, a high hardness abrasive is used.