Calculation of nozzle cross-section
For surface grinding, internal and external cylindrical grinding with CBN, a throughput of 3 I/min per mm wheel thickness (20 US gallon/min per inch wheel thickness) is considered adequate for most purposes.
(Source: Research by the University of Bristol, IGT)
Example of a nozzle cross section calculation for 10 mm thick CBN wheel:
| Given: |
Flow rate per mm wheel thickness |
Qk' |
|
3 I/min |
|
Flow rate for 10 mm wheel thickness |
Qk |
|
30 I/min |
|
Peripheral (surface) speed |
Vc |
|
60 m/s |
| Required: |
Nozzle cross section in mm2 |
An |
|
mm2 |
| Solution: |
Nozzle cross section in mm2 |
An |
= |
Qk * 1000 / Vc * 60 |
|
|
|
= |
30 * 1000 / 60 * 60 |
|
|
|
= |
8.5 mm2 |
| Result: |
Nozzle diameter internal grinding |
|
= |
3.3 mm |
|
Width of slot (surface and external grinding) |
|
= |
0.8 mm |
|
(length of slot 1 mm wider than wheel thickness |
|
= |
11 mm) | |
