About Bonded Abrasives
Normal bonded abrasives is a kind of abrasive which the bonding agent bonded normal abrasive grains into some shapes with some certain strength. Generally composed of abrasive grains, bonding agent and air pores, these three parts are often called the three elements of bonded abrasives.
Abrasive grains play the cutting and grinding roles in abrasives.
Bonding agents are materials that bind loose abrasives grains into abrasives, it is divided into two types: inorganic and organic bonding agent. Inorganic bonding agents include vitrified, rhombus and sodium silicate. Organic bonding agents has resin, rubber etc. The most commonly used bonding agents are vitrified, resin and rubber agent.
The air pores can hold debris and remove debris during grinding and cutting, and can hold coolant, which is helpful to the escape of grinding heat. In order to meet some special processing requirements, some fillers(filling agent), such as sulfur and paraffin, can also be impregnated in the pores to improve the performance of the abrasives. This filler(filling agent), also known as the fourth element of the abrasives.
The items that represent the characteristics of common bonded abrasives are: shape, size, abrasive grains, grit No., hardness, structure, back pile, back glue and bonding agent. The hardness of the abrasive is the difficulty of falling off the surface from the abrasives under the action of external force, which reflects the strength of the bonding agent holding the abrasive.
The hardness of the abrasives mainly depends on the amount of bonding agent added and the density of the abrasives. The abrasive grains is easy to fall off, which indicates that the hardness of the abrasives is low; conversely, the hardness is high.
In cutting or grinding, if the material hardness of the work-piece is high, the abrasives with low hardness is generally used; conversely, the abrasives with high hardness is chosen.
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