Shot blasting intensity of the machine can be adjusted via the following methods:
Adjust the hardness of abrasive shot
If the hardness of the shot exceeds that of the workpiece, slight changes in shot hardness will barely affect blasting intensity. However, if the shot is softer than the workpiece, reduced shot hardness will lead to weaker blasting force.Therefore, for soft workpieces with insufficient blasting intensity, switch to higher-hardness abrasive shot.
Select the appropriate shot size
Larger shot gains higher impact kinetic energy and delivers stronger blasting intensity, yet its coverage area decreases. To secure uniform blasting effect, smaller shot sizes are preferred whenever possible.In addition, shot size is restricted by workpiece geometry. For workpieces with grooves, the shot diameter shall be less than half the inner radius of the groove. The common particle size range is 6–50 mesh.
Control the proportion of broken shot fragments
Broken shot fragments carry low kinetic energy. A high volume of fragments reduces overall blasting intensity, and irregular broken grit will scratch workpiece surfaces.Broken abrasives shall be removed regularly to keep intact shot proportion above 85%, maintaining stable blasting intensity.
Modify shot ejection velocity
Higher shot velocity increases blasting intensity, yet excessive speed causes excessive surface damage to workpieces.Shot speed is regulated by adjusting motor rotation speed to change the rotational speed of the blasting wheel. Higher velocity applies to hard materials; lower velocity is required for brittle materials.
Adjust blasting projection angle
Maximum blasting intensity is achieved when the shot stream hits the workpiece surface perpendicularly; this perpendicular setup is the standard operating state.If workpiece structure forces a small blasting angle, appropriately increase shot size and ejection speed to meet required blasting intensity.
Regulate shot flow volume
Shot throughput is controlled by the steel shot flow regulating valve, which directly impacts blasting intensity.The adjusting screw of the rotary shot flow control valve allows on-demand adjustment of shot feed volume. Under stable operating conditions, larger shot flow brings stronger blasting intensity.Meanwhile, the maximum rated current of the blasting wheel motor must not be exceeded; the operating current should generally be kept at 90% of the maximum rated current.
