The application of sandblasting on the metal surface is very common. The principle is to collide the accelerated abrasive particles on the metal surface to achieve rust removal, deburring, deoxidization or surface pretreatment, etc., which can change the smoothness of the metal surface. and stress state. And some parameters that affect sandblasting technology need to be paid attention to, such as abrasive type, abrasive particle size, spray distance, spray angle and speed. In addition to sandblasting, shot blasting is also a good option.

The sand blasting process can be divided into two types: air pressure spray gun and impeller shot blasting. The advantage of the sand blasting process is that it can remove peaks and burrs after die casting, stamping, flame cutting and forging. The burr effect is better, it can clean the residual sand in the sand casting process, clean the rust stains of the cast iron or steel, clean the descaling after heat treatment, burning, hot forging, rolling and other hot processes. In addition, in coating applications, it can remove existing coatings or protective layers, provide a glossy finish in covering defects such as cracks or cold streaks on castings. In addition to the surface stress, it can provide a consistent roughening surface, oiling and spraying effects. When high-stress metal parts such as springs and connecting rods are continuously beaten locally, deformation and strengthening will occur. This strengthening effect requires the use of round abrasives such as stainless steel shot in a high-energy shot blasting machine or a dedicated powerful sandblasting machine. To determine the surface strengthening effect of the machine, the test workpiece can be shot or sandblasted, and then the deformation amount can be measured to meet the requirements.