The weight of the abrasive per unit volume is called the bulk density of the abrasive, and its unit conventionally expressed as g/cm3. The bulk density of the abrasive has a certain influence on the strength, hardness and cutting performance of the abrasive tool, in addition, it also has a certain influence on the other properties of the abrasive.
The factors that affect the bulk density of abrasive mainly include the type of abrasive，the size and the crushing method of abrasive. Generally speaking, under the same conditions, the bulk density of corundum is larger than that of silicon carbide, the bulk density of coarse-grained corundum is larger than that of fine-grained corundum, the bulk density of abrasive in regular shape is larger than that abrasive in sheet and sword shape, and the bulk density of abrasive processed by ball mill is larger than that processed by roller mill and jaw crusher.
For the production of abrasives, the bulk density of the bonded abrasives used for the production should be as large as possible, so that the abrasives have higher strength and hardness as well as better cutting performance. For the production of coated abrasives, the bulk density should be as small as possible to ensure the sharpness of the abrasives.
The bulk density of abrasive can be changed by shaping, such as can improve the bulk density of abrasive by ball mill or and can reduce the bulk density of abrasive by roll machine or jaw crusher. In addition, the use of mixed abrasive grains can improve the bulk density of abrasive. The bulk density of abrasives can reach a maximum if the size of coarse and fine can be matched appropriately.
