Shot blasting machine is most common equipment for most metal working industries. That is used for cleaning, strengthening (peening), polishing or roughening. That make it much simple and effective with better consistency compared with manual operation. Painting or coating will be usually following process.
Basic working principle of shot blasting process is simple.
An impeller is equipped in blasting wheel, the heart of shot blasting system. That pumps the metal abrasive – say, steel shot, steel grit or cut wire shot onto the blades through the control cage. Control cage is located in the center of a rotating wheel. Then abrasive is thrown toward the workpiece by the blades. Finally the blast pattern (also called hot spot) is produced on the workpiece.
That is ideal that all workpieces are processed properly, if all machine adjustments are managed correctly for job at hand.
If not, the machine will be out of control. The abrasive may be thrown toward the roof, floor or anywhere of the blast chamber. Blasting wheel housing or guard plate of blast chamber may be destroyed quickly.
So how to get a proper hot spot is critically important.
This is a simple question, but no simple answer.
One or several blasting wheels are equipped in shot blasting system. Right quantity, position, point and wheel model will ensure metal abrasive stream can cover all workpiece surfaces. But that is not controlled by user or buyer. A shot blasting machine manufacture usually will confirm detailed workpiece information, processing effect requirement and processing productivity with user or buyer. That will guarantee shot blasting machine is designed and purchased for specific workpiece, workpiece family or majority of workpieces.
This picture shows different hot spot with blast wheel point.