Material
The abrasive tool is made of materials: white electrocorundum, chromium electrocorundum, silicon carbide green, as well as with using microcrystalline corundum (sol gel).
Hardness
The hardness of highly porous circles in most cases it is controlled by an acoustic method with a sound type device indicating the sound the index. The table of correspondence of the sound index and the hardness of the abrasive the tool
| Hardness | Hardness | Sound Index (ZI) |
| The new standard of Russia | The old standard of Russia | |
| F | VM1 | 31-33 |
| G | VM2 | 33-35 |
| H, I | M1, M2 | 37-41 |
| J | M3 | 41-43 |
| K | CM1 | 45-47 |
| L | CM2 | 49 |
| M | C1 | 51 |
Grain size
The grain size of abrasive powders used in production of tools
| The new standard of Russia (FEPA Standard) | The old standard of Russia |
| F46 | 40 |
| F54 | 32 |
| F60 | 25 |
| F70 | 20 |
| F90 | 16 |
| F100 | 12 |
| F120 | 10 |
| F150 | 8 |
| F180 | 6 |
| Micropowders | |
| The Russian Standard | FEPA Standard |
| M50 | F240 |
| M40 | F280 |
| M28 | F360 |
| M20 | F400 |
| M14 | F500 |
| M10 | F600 |
Highly porous abrasive tools
ADVANTAGES OF THE APPLICATION HIGHLY POROUS ABRASIVE TOOLS Due to the presence of large pores in highly porous circles: - provides the possibility of better drainage removable chips - the best conditions are created for cooling the part in the zone cutting - the probability of greasing the circle decreases - prevented the occurrence of cauterization of the polished part. APPLICATION EXAMPLES - deep grinding of the turbine blade - grinding of aircraft parts made of titanium and heat-resistant alloys - deep single-pass grinding of grooves in the cams of the turning chuck - deep grinding of grooves of linear rolling bearings parts - flat grinding of machine tool guide rails - grinding of the profile of rails and carriage wheels - grinding of gears CHARACTERISTICS OF HIGHLY POROUS ABRASIVE THE TOOL Porosity: the main characteristic a highly porous tool that allows for high-performance and burn-free grinding, is the presence of large pores.
Grinding abrasive highly porous wheels are used in the production of turbines for grinding parts made of viscous, highly plastic alloys (heat-resistant, titanium), for burn-free productive grinding of gears, as well as for grinding non-ferrous alloys, polymer coatings on the shafts of papermaking machines.
