We woud like to discuss a little bit about the advantages of Brown Fused Alumina to be used as abrasives to prepare metal workpieces.

1. The force of the workpiece is easy to analyze. For the traditional free Brown Fused Alumina abrasive grinding, the abrasives is scattered on the grinding wheel, and its motion is random, and the grinding and cutting force of the super rock brand brown fused alumina on the workpiece is also random, which makes it very difficult to fold the force of brown fused alumina on the workpiece. Therefore, so far, no one has discussed the force of brown fused alumina on the workpiece. In the high speed grinding of consolidated brown fused alumina, the movement law of brown fused alumina and abrasive tool is known, which provides a necessary condition for us to study the force of brown fused alumina on workpiece.

2. The density distribution of brown fused alumina is controllable. In free grinding, brown fused alumina is randomly distributed on the grinding wheel, and changes continuously with the movement of the grinding wheel, so the density distribution of brown fused alumina is uneven and can not be controlled. In the grinding of consolidated brown fused alumina, it is made into pellets and bonded to many position points of the grinding wheel, and the density distribution of brown fused alumina is controllable. Therefore, according to the relative trajectory density distribution between workpiece grinders, the brown fused alumina density distribution on grinding tools is designed reasonably, so that the wear of grinding tools in the grinding process does not affect the surface shape accuracy of grinding tools, so as to avoid the trouble of dressing grinding tools.

3. The grinding speed is fast and the grinding efficiency is high. In the free brown fused alumina grinding, because it's is discrete distributed on the grinding disk, the grinding speed can not be too fast, in order to avoid splashing, in addition, in the grinding process, the brown fused alumina not only acts on each other, but also has relative movement, which results in the cutting effect between brown fused alumina, that is, brown fused alumina, which aggravates the waste of brown corundum abrasive. This makes the grinding efficiency low and the processing cost high.And in the consolidation of the brown fused alumina, because the problem of the splash of it is not present, a higher rotating speed can be adopted, generally at 400-700r/ min, so that the grinding and processing efficiency is improved, and the processing cost is reduced.
In addition, if there is excess titanium oxide (TiO2) in brown fused alumina, it can not be retained in glass phase, but react with alumina to form aluminum titanate. Aluminum titanate is the third phase on the interface between α-alumina grain and glass phase, which will cause the weakening of glass phase between α-alumina grains. The difference of thermal expansion coefficient between the three phases will also cause cracks between grains during heating.
Most of the silica in the brown fused alumina was found in the glass phase. The ratio of TiO2 to SiO2, which is acceptable for typical brown-alumina technology conditions, is in the order of 2.5:1 to 6:1. Most of the titanium dioxide is present as a solid solution of the iron-alumina grains. During the reduction in the furnace, a portion of the TiO2 is reduced to titanium-based sub-oxides (Ti2O3).
The ratio in the mixture of titanium dioxide and alumina melting must be of great concern to keep it in such a way as to produce brown fused alumina that meets the technical conditions. At the same time, TiO2 in brown fused alumina cannot be reduced. The amount of solid Ti2O3 is very important to the calcined color and toughness of brown fused alumina.

4. The machining accuracy of workpiece surface is high. For free brown fused alumina grinding, the size of brown fused alumina grinding material can not be completely the same. When the brown fused alumina is put on the grinding wheel, when the workpiece is put on the workpiece, the surface of the workpiece is mainly in contact with the larger brown fused alumina, so the larger brown corundum abrasive is mainly involved in the grinding processing, which makes the number of brown fused alumina participating in the brown corundum abrasive less, and the pressure borne by each brown corundum abrasive participating in the grinding is large, the pressure is strong, and the grinding capacity is large. Moreover, the distance between them is also large, and the scratches produced by grinding are deep and wide, so the surface of the workpiece ground with free brown fused alumina is rougher than that with fixed brown corundum abrasive grinding.
For consolidated brown fused aluminae grinding, it is consolidated by binder to make grinding tool. When the machine is placed on top of the grinding tool, because of the function of binder, not only the large size brown corundum abrasive can contact with the workpiece surface, but also many smaller brown corundum grinding materials can also contact with the workpiece surface, so that the number of brown corundum abrasive in contact with the workpiece surface is large, at the same time, the number of brown corundum abrasive involved in grinding processing is large, and each brown corundum abrasive is subjected to small pressure, small pressure and shallow grinding depth. Moreover, the distance between brown corundum abrasives involved in grinding is small, the machined surface roughness of the workpiece is small, and the machined surface quality is high.