What is the effect of steel grit hardness on the shot blasting machine?

The impact force of steel shot in a shot-blasting machine primarily affects shot-blasting intensity, the treatment outcome, equipment wear, and the surface quality of the workpiece.

**Shot-blasting intensity:** The hardness of the steel shot directly influences shot-blasting intensity. If the shot hardness exceeds that of the workpiece, the intensity remains unaffected by hardness variations; however, if the shot hardness is lower than that of the workpiece, the intensity decreases.

Additionally, shot velocity and size influence intensity. Higher velocity yields greater intensity, though excessive speed can accelerate shot wear; larger shot sizes provide greater kinetic energy, but may not be suitable for all workpiece geometries.

**Shot-blasting effect:** Steel shot hardness directly impacts the treatment outcome. Insufficient force leads to incomplete cleaning, while excessive force can damage the workpiece surface. Selecting the appropriate abrasive hardness and size is crucial for ensuring effective blasting and optimizing performance.

**Equipment wear:** Excessive impact from steel shot accelerates equipment wear, leading to higher maintenance costs. Excessive hardness also increases the likelihood of shot fragmentation, further exacerbating equipment wear and maintenance expenses.

**Workpiece surface quality:** Steel shot hardness also affects the quality of the workpiece surface. Excessive force can damage the surface, whereas insufficient force may fail to achieve the desired finish. Selecting the appropriate grain hardness is vital for preserving the workpiece's surface quality.