How to choose the best diamond grinding wheel for industrial ceramics!
Industrial ceramic is an important engineering structural material. Industrial ceramics include alumina series, zirconia series, silicon nitride series, and silicon carbide series. Compared with metal materials, industrial ceramics have excellent heat resistance, wear resistance, corrosion resistance and rigidity ratio.
So industrial ceramics are widely used in gas turbine engine parts, diesel engine parts, steel-making machine parts, high-temperature fan parts, high-temperature bearings, high-temperature insulation materials, cutting tools, grinding materials, dies, sliding machine parts, nozzles, mechanical seals, precision measuring instruments, precision grinding machine, etc.
Selection of grinding wheel for industrial ceramics
1. Selection of abrasive grains
The above performances of industrial ceramics make the processing very difficult. So,
The diamond grinding wheel is still the main processing tools at present. The abrasive grains of diamond grinding wheel play the role of cutting edge. Whether the abrasive grains are fragmented or tough has an effect on the shape of cutting edge and grinding features.
Comparison of the influence of abrasive grain properties on grinding performance of grinding wheels which made of different fragmented abrasive grains and same bond are as follows: The fragmented performance of grinding wheel is better for larger brittleness, and the grinding force is smaller than that wheel with stronger toughness. This is because the top of abrasive grains with strong tough is not broken but worn. And the fragmented abrasive grains often have sharp cutting edges.
Because the grinding properties of grinding wheels are different, the grinding features will change. So, when choosing the grinding wheel, the suitable bond should be chosen according to the purpose of operation, processing conditions and materials to be processed.
2. Selection of grain size
Grain size mainly affects the roughness of grinding surface and grinding efficiency. The grain size is coarse, and the grinding efficiency is high, but the surface roughness is large. If the grain size is fine, the grinding effect is just the opposite.
At the same time, grain size also has some influence on the grinding force and the grinding ratio. The results show that with the increase of grain size, grinding force increases and a load of spindle increases. The grinding ratio decreases with the fineness of grinding wheel. So, when choosing grain size, we should learn about the operation purpose. Pay attention to efficiency when rough grinding, and pay attention to quality when finish grinding.
3. Selection of hardness
The hardness affects the abrasion of grinding wheel. The grinding wheel with high hardness has high abrasion resistance and high grinding ratio. But pay attention to the hardness is too high, the abrasives will be easily blunt.
4. Selection of concentration
The concentration is related to the number of abrasive cutting edges. The higher the concentration, and the more cutting edges. In the grinding process, if the concentration is higher, the smaller average load on one abrasive grain. Therefore, the wear of abrasive grains becomes slower and the grinding ratio increases. However, for diamond grinding wheels, the reasonable combination of grain size, concentration and bond can achieve the good grinding effect.
5. Bond effect
There are many kinds of bonds for diamond grinding wheel, including vitrified bond, resin bond, and metal bond. When the grinding conditions are not very harsh, the wear of different kinds of bonded grinding wheels has little difference. Under harsh grinding conditions, the wear of vitrified bond diamond grinding wheels increases due to thermal shock, while metal bond wheels express excellent performance.
On the contrary, from the view of the grinding force, with the increase of workpiece removal stock, the value of the grinding force of metal bonded grinding wheel is larger. The wear of resin bond grinding wheels and grinding force are generally between vitrified bond grinding wheels and metal bond grinding wheels.
Owing to many kinds of industrial ceramics and different processing conditions, when choosing the suitable grinding wheels according to the features of various bond diamond grinding wheels. At the same time, we should also pay attention to choose suitable workpiece speed, cutting depth and cutting fluid. At the same time, with the development of diamond sanding abrasive belt technology, abrasive belt grinding has become one of the important ways to process industrial ceramics. Details can be referred to the experimental study of electroplated diamond abrasive belt grinding alumina ceramics.