What is the optimal throwing distance for the shot blasting wheel?
The distance between the shot blasting wheel and the surface of the workpiece to be cleaned is determined by two factors: Roller Texturing Shot Blasting Machine
First: As the shot travels through the air, it encounters air resistance, causing its velocity to decrease. Theoretical analysis shows that the
velocity decay rate of the shot in the air can be expressed by an exponential function:
δ=100e-0.0568s/ds(%)
Where S-----Throwing distance (m)
ds----Shot diameter (mm)
From the above formula, it can be seen that the exponent of this exponential function is very small and changes slowly. Within a certain common distance S range, it can be approximated as a straight line.
Therefore, the above formula can be transformed into a linear function representation:
δ=100-bs
Where b-----The slope of the straight line within the effective distance range.
The distance range and slope for linear decay are shown in Table 2. Roller Shot Blasting Machine, Roller Texturing Shot Blasting Machine, Shot Blasting Machine, Roller Conveyor Shot Blasting Machine, Blasting Room
Table 2
|
Shot Diameter (mm) |
0.2 |
0.4 |
0.6 |
0.8 |
1.0 |
1.2 |
1.6 |
2.0 |
2.5 |
3.0 |
|
Effective straight-line change distance S(m) |
0.8 |
1.6 |
2.4 |
2.6 |
3 |
3.8 |
5 |
6 |
8 |
10 |
|
Slope b |
25.3 |
12.7 |
8.62 |
6.6 |
5.36 |
4.43 |
3.32 |
2.61 |
2.13 |
1.77 |
Second: The shot flow from the shot blasting wheel is ejected in a scattering state, and the cross-sectional area of the ejection increases with the distance S2, while the shot density decreases with
the distance.