Blasting equipment is first used in casting cast steel, iron castings of the surface of bonded sand and oxidation of the removal of the skin.
Almost all steel castings, gray castings, malleable steel parts, ductile iron and so on are to be shot blasting treatment. This is not only to remove the casting surface oxide and sticky sand, but also the casting quality inspection is indispensable before the preparation process, such as large gas turbine chassis in the non-destructive testing must be carried out before the strict blasting blasting to ensure the reliability of the results. In the general casting production, the blasting blasting is a necessary technology to find the surface defects such as the skin gas hole, slag hole and sticky sand, cold insulation and peeling. Non-ferrous metal castings, such as aluminum alloy, copper alloy, such as surface cleaning, in addition to the removal of oxidized skin, the surface defects found castings, the more important purpose is to remove the burr of the die casting shot and to obtain the decorative meaning of the surface quality, to obtain comprehensive results. In metallurgical iron and steel production, shot peening or pickling is a method of mechanical or chemical joint removal of phosphate peel to ensure high productivity in steel production. In the production of other alloy steel plates and strips, such as silicon steel sheets and stainless steel sheets, the annealing process must be done before blasting or pickling treatment to ensure the surface roughness and thickness accuracy of cold-rolled steel sheet.
According to the modern metal strength theory, increasing the dislocation density inside the metal is the main direction to improve the metal strength. It is proved by practice that shot peening is an effective method to increase dislocation structure of metal. This is of great importance to some metals which cannot be hardened by phase change hardening (such as martensite quenching) or by the realization of phase change hardening. Aviation, aerospace industry, automobiles, tractors and other parts require light, but the reliability requirements are more and more high, the important technical measures is to use the shot blasting technology to improve the strength and fatigue strength of the components.