Diamond and CBN tools for machine building, glass, woodworking and other industries.
Grinding Wheels with Vitrified Bond
The Application Area:– cylindrical grinding, flat grinding, internal grinding operations- producing of details for bearing industry etc.- sharpening of metal cutting tools- gear-grinding operations- thread-grinding operations- producing parts for turbine etc. Main Processed Materials– instrument steel (R18, R6M5 etc.)- bearing steel- titanium alloy- heat-resistant steel- alloy-threated steel Main Rules for Vitrified Bonded Grinding Wheels Hardness Selection1. Grinding of hard materials – soft bond.The soft bond also could be used for grinding of soft and yielding materials,such as heatproof and nonferrous alloys.2. For rough grinding should be used wheels with harder bond.3. In case of speed rising client should decrease the hardness of the bond.4. In case of large contact of grinding wheel with processed surface should be used softer bond.
General recommendations how to chose required hardness of the vitrified bonded wheels
| Grinding operation | Hardness |
| External cylindrical grinding:cut-in, Ra 0,32 – 1,25line feed, Ra 0,16 – 0,63 | N…OM…N |
| Centerless grinding:cut-inoperation with line feed | N…РM…О |
| Internal | O…R |
| Flat grinding:with wheel peripherywith wheel face | L…M |
| Tooth grinding:module < 3 mmmodule ≥ 3 mm | L…NK…M |
| Thread grinding:step 0,5…1,0 mmstep 1,0…1,5 mmstep 1,5…2,0 mmstep more than 3 mm | P…RO…PM…NL…N |
| Tool sharpening of HSS:roughfine | L…MK…L |
Concentration
Selection of concentration depends on a number of factors and can be made as follows.
| Concentration | Application conditions |
| High(125…150%) | • for wheels with grit Â151 and coarser• for wheels with small diameters (< 50 mm)• for profile grinding wheels |
| Average(100%) | For most types of grinding operations when grit varies from B126 ….B64 |
An example of order of 1A1 wheel with dimensions 250 20 5 32, CBN powder, grit B151, concentration 100% and hardness К (СМ1), vitrified bond ВС-1К: 0-1003 1А1 20-20-5-32 CBN1 В151 ВС-1К
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