Shot Blasting and Shot Peening

Shot Blasting

Shot Blasting is a process that the motor drives the impeller rotation (direct drive or use the "V" belt drive) to shoot the surface of parts with projectiles (the diameter is about 0.2 ~ 3.0, such as cast steel shot, steel cut wire shot, stainless steel shot), with the function of centrifugal force, which results in a certain roughness, then better its appearance or change the workpiece welding tensile stress into compressive stress, and then improve the service life. Raising the surface roughness also can improve subsequent paint film adhesion. That means that shot blasting could be used as the former procedure of spray painting.

Shot Peening

The clean function is great because of big hitting power by shot peening. But shot peening easily deform the parts when used in thick parts. Both shot peening and shot blasting isn’t able to remove oil throughly. The cleaning function of sand blasting is the best of current surface treatment.

Shot Blasting vs Shot Peening

Shot peening uses high-pressure wind or compressed air as power, instead of high-speed rotating flywheel for shot blasting. Blasting efficiency is high, but there will be a blind corne. However shot peening is more flexible, but power consumption is big.

Injection power and ways of the two process is different, but both aim at high speed impaction, then the function is basically the same. By contrast, shot peening is fine, and more easily control accuracy, but less efficient than shot blasting, so suitable for small pieces with complex geometry. Blasting is more economical, practical, and easy to control cost, efficiency, and injection function, But there will be a blind corner, so is suitable for parts with massage production and simple geometry.

Determin shot blasting or shot peening depends on the geometry and efficiency.