Analysis of the difference between shot peening and sand blasting for metal surface treatment

       Sand blasting and shot blasting use high-pressure air or compressed air as the power to blow out the blasting material to impact the surface of the workpiece to achieve the cleaning effect. But the choice of medium is different, and the sandblasting medium has a cutting effect on the surface; after sandblasting, the dirt on the surface of the workpiece is removed, the surface of the workpiece is damaged by traces, and the surface area is greatly increased, thereby increasing the connection between the workpiece and the coating/coating. binding strength.



The use of metal surface treatment equipment for shot blasting cleaning of the workpiece can obtain the following benefits: improve the surface and internal quality of the product, and bring new business opportunities for manufacturers; after shot blasting, the workpiece can obtain a certain roughness and a clean metal surface. Uniform and consistent, improve the corrosion resistance of mechanical products and metal materials; eliminate the internal welding stress of structural parts, improve its fatigue strength, and obtain long-term service life; increase the adhesion of the paint film, improve the decorative quality and anti-corrosion effect of the workpiece; metal surface The processing equipment realizes the PLC automatic cleaning mode, which greatly improves the work efficiency, reduces the labor intensity of the cleaning work, and improves the production efficiency of the enterprise.



The difference between shot blasting and sand blasting for metal surface treatment

Shot blasting and sand blasting are powered by high-pressure air or compressed air, and blow out at high speed to impact the surface of the workpiece to achieve cleaning effects.

After sandblasting, the dirt on the surface of the workpiece is removed, the surface of the workpiece is damaged by traces, and the surface area is greatly increased, thereby increasing the bonding strength of the workpiece and the coating/coating.



The surface of the workpiece after sandblasting is metallic, but because the surface is rough and the light is refracted, it has no metallic luster and is a dark side.



After shot peening, the dirt on the surface of the workpiece is removed, the surface of the workpiece is microscopic but not damaged, and the surface area is increased. Since the workpiece surface is not damaged during the machining process, the excess energy generated during the machining process will cause the surface of the workpiece matrix to strengthen.



The surface of the workpiece after shot peening is also metallic, but because the surface is spherical, the light is partially refracted, so the workpiece is processed into a matte effect.



It is widely used in repair, shipbuilding, shot blasting, sand blasting, etc. But shot blasting and sand blasting are carried out in the form of compressed air. Of course, it is not necessary to use high-speed rotating impeller shot blasting. Generally speaking, in the repair and shipbuilding industry, shot blasting (small steel shot) is used for the pretreatment of steel plates (rust removal before painting); sand blasting (repair, the shipbuilding industry is used on ore) is used for forming ships or Profile, the role is to remove the old paint and rust on the steel plate, and repaint. In the repair and shipbuilding industries, the main function of shot blasting and sand blasting is to increase the adhesion of the steel plate coating.



Using shot peening for surface treatment, the impact force is large, the cleaning effect is obvious, and the power consumption is large. Generally, shot peening is used to eliminate oxide scale, rust, molding sand and old paint film on medium and large metal products with a thickness of not less than 2 to 6 mm or that do not require accurate dimensions and contours, as well as castings and forgings. It is a surface coating (plating) A method of cleaning up the previous paragraph.