The stacked abrasive belt is composed of a series of coarse abrasive grains, in fact, each large abrasive grain contains many fine alumina and silicon carbide particles. In addition to the conventional alumina and silicon carbide abrasives, there are also ceramic corundum abrasives; the latter is composed of relatively rough appearance and approximately spherical abrasive grains. But in essence, their internal structures are similar, that is, each large abrasive grain is bonded by a large number of abrasive grains smaller than the conical abrasive grains or abrasive grain clusters. The surface abrasive grains will be passivated after cutting a certain amount of material, and the blunted small abrasive grains will break off from the conical abrasive grains or abrasive grain clusters, and the new abrasive grains located in the inner layer will be exposed to participate in grinding. Therefore, The new stacked abrasive belt has a long life and a uniform material removal rate due to the continuous sharp cutting edge produced during the grinding process. Although the material removal rate of ordinary abrasive belt grinding is slightly higher than that of accumulated abrasive belt in the early stage, it decreases rapidly with the increase of grinding time; on the contrary, the material removal rate of accumulated abrasive belt decreases slower than that of ordinary abrasive belt, and with the grinding The increase of cutting time gradually decreases and tends to zero, and the service life is more than 4 times that of ordinary abrasive belts.
The multi-layer abrasive grain structure can effectively improve the service life of the abrasive belt. The surface layer of the abrasive belt is undulating, which improves the flexibility of the multi-layer abrasive belt to a certain extent. The multi-layer abrasive belt has a certain abrasive layer. When the upper layer of abrasive grains breaks and falls off, a new cutting layer will be exposed, so the multi-layer abrasive belt has a longer service life and a certain degree of self-sharpening. However, the number of layers of abrasive grains is limited, because too many layers will make the belt stiff and cannot grind effectively.
Hollow ball abrasives are recognized as the most effective abrasives in the world, not only can be used for grinding and polishing workpieces, but also have remarkable heavy-duty grinding effects. For example, the hollow ball abrasive belt is a compound abrasive belt formed by fixing many hollow spherical shells with fine abrasive grains on the surface through a binder. The spherical shell is thin and brittle, and it is made of brittle and hard materials such as thermoplastic resin or glass. Among them, the number of abrasive grains on a single spherical shell is as high as more than 200, and the abrasive type is usually zirconium corundum or ceramic corundum. Similar to the stacked abrasive belt, the relatively low height of the new abrasive grains after blunting will protrude to participate in the cutting, so it has a long service life. After the abrasive belt is used for a period of time, the abrasive grains begin to break and open holes, but they still have high mechanical strength and last for a long time.
The purpose of the invention of the non-woven abrasive belt is to improve the grinding performance and processing quality of the coated abrasive. Due to the use of non-woven fiber matrix, the abrasive grains can be evenly bonded to the soft elastic fiber in space. It has the outstanding characteristics of good surface consistency of the processed parts, no dark lines, light weight of the abrasive belt and strong tear resistance.