Grinding stones
Application: superfinishing and honing of structural alloy and instrumental steels.
Manufacturing methods:
- semidry shaping of grits F 40 - F 1000
- cold slip casting of grits F 600 - F 1200
Stones are manufactured:
- in accordance with GOST 2456-82
- in accordance with OST 2 И70-10-90, OST 2 И70-8-87 for companies of bearing and automotive industries
- on customer’s drawings
- sulfur impregnation is performed in order to increase the flexural strength of stones.
Main types of stones defined in the standard GOST 2456-82
for A and B accuracy classes
| Type of stone | Type marking | Width, mm (B) | Height, mm (С) | Length, mm (L) |
|---|---|---|---|---|
| Square stone | БКв | 5-45 | 5-45 | 50-250 |
| Rectangular stone | БП | 6-50 | 3-40 | 25-200 |
| Triangled stone | БТ | 10,13,16,20,25 | 100,150 |
Example of designation of the stones
| type | B | С | L | material | grit size | hardness | bond | structure | Method of manufacture | Accuracy class |
|---|---|---|---|---|---|---|---|---|---|---|
| БКв | 20 | 20 | 150 | 25А | М28 | СМ2 | К | 10 | А | |
| БП | 50 | 25 | 150 | 64С | М7 | М3 | К | Л | Б |
The approximate dependence of processed material surface
roughness from abrasive stones grit size
| Grit size | Roughness, Ra, micron |
|---|---|
| 40-25 | 0,32-1,6 |
| 16-10 | 0,28-1,0 |
| 8-М40 | 0,16-0,63 |
| М28 | 0,12-0,32 |
| М20-М14 | 0,08-0,28 |
| М10-М7 | 0,04-0,10 |