The shaft that is easy to fatigue fracture shall be shot peened

Dalian sand blasting processing, sand blasting processing is used for complex shape, easy to remove rust by hand, low efficiency, poor on-site environment and uneven rust removal. General sandblasting machines have sandblasting guns of various specifications. As long as it is not a particularly small box, you can put the gun in and clean it. The supporting product of pressure vessel - the head adopts sand blasting to remove the oxide skin on the workpiece surface, and the diameter of quartz sand is 1.5mm ~ 3.5mm. One kind of processing is to use water as a carrier to drive emery to process parts, which is a kind of sand blasting.

Shot blasting is to hit the surface to be cleaned at high speed to achieve the cleaning effect; Sand blasting is to cut the surface to be cleaned with compressed air to achieve the cleaning effect. The main function of the sand blasting machine is to remove rust and scale on the surface, such as the parts after heat treatment, while the shot blasting machine has many functions and functions: not only remove rust and scale on the surface, but also improve the surface roughness, remove the machining burr of the parts, eliminate the internal stress of the parts, reduce the deformation of the parts after heat treatment, and improve the wear resistance and pressure resistance of the parts surface.

Spraying and polishing: spraying is to use compressed air as power to spray sand or shot material onto the material surface to achieve removal and certain roughness. Polishing is a method of impacting the material surface with centrifugal force generated when the shot rotates at high speed to achieve removal and certain roughness.

Although the two processes have different spraying power and methods, they both aim to impact the workpiece at high speed, and their effects are basically the same. In comparison, shot blasting is more fine and easy to control the accuracy, but the efficiency is not as high as shot blasting. It is suitable for small workpieces with complex shapes. Shot blasting is more economical and practical, easy to control the efficiency and cost, and can control the particle size of shot to control the spraying effect, but there will be dead corners, It is suitable for batch processing of workpieces with single shape and surface. In terms of the degree of damage, it is much easier to damage when there is tensile stress on the surface of metal materials than when there is compressive stress.

When the surface of the part is under compressive stress, the fatigue life of the material is greatly improved. Therefore, for the shaft and other parts that are easy to fatigue fracture, shot peening is usually used to form compressive stress on the surface, so as to improve the service life of the product. Both sand blasting and shot blasting shall ensure the surface roughness requirements of the next process. Sand blasting is generally used for complex shape, difficult to remove rust manually, low efficiency and poor site environment, while shot blasting is used for regular shape, high efficiency and less pollution.