The cylinder tube is processed by rolling. Because the surface layer is left with residual compressive stress on the surface, it helps to close the small cracks on the surface and hinder the expansion of erosion. As a result, the corrosion resistance of the surface is improved, and the generation or expansion of fatigue cracks can be delayed, thereby increasing the fatigue strength of the cylinder tube. Through roll forming, a cold hardened layer is formed on the rolled surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the abrasion resistance of the inner wall of the cylinder tube and avoiding burns caused by grinding. After rolling, the surface roughness value is reduced, which can improve the mating properties.
Rolling processing is a kind of chip-free processing. At normal temperature, the plastic deformation of the metal is used to smooth out the micro unevenness on the surface of the workpiece to change the surface structure, mechanical characteristics, shape and size. Therefore, this method can simultaneously achieve two purposes of finishing and strengthening, which cannot be achieved by grinding. No matter what kind of processing method is used, there will always be fine convex and concave tool marks on the surface of the part, and there will be staggered peaks and valleys.
Rolling processing principle: It is a kind of pressure finishing, which uses the cold plastic characteristics of metal at normal temperature, and uses rolling tools to apply a certain pressure to the surface of the workpiece to cause plastic flow of the surface metal of the workpiece and fill it into the original residue. In the low concave trough, the roughness of the workpiece surface is reduced. Due to the plastic deformation of the rolled surface metal, the surface structure is cold hardened and the grains become fine, forming a dense fibrous shape, and forming a residual stress layer, the hardness and strength are improved, thereby improving the wear resistance and corrosion resistance of the workpiece surface Sexuality and cooperation. Rolling is a non-cutting plastic machining method.