Due to the existence of residual stress on the surface of the cylinder, it is advantageous for the closure of small surface cracks and the expansion of erosion. Therefore, the corrosion resistance of the surface can be improved, and the fatigue crack can be delayed or enlarged. By rolling, the rolling surface forms a cold hardened layer, which reduces the elastic and plastic deformation of the grinding contact surface, thereby improving the wear resistance of the inner wall of the cylinder and avoiding burns caused by grinding. After rolling, the surface roughness is lowered to improve the matching performance.
Rolling is a non-chip process that uses plastic to deform at room temperature to roll the surface roughness of the workpiece surface to achieve surface structure changes, mechanical properties, shape and size. Therefore, the method can achieve the purpose of fine grinding and strengthening at the same time, and cannot be completed by two grinding methods. No matter what processing method is left, the traces left, the subtle violations on the surface will appear peak valley cross-rolling phenomenon.
Rolling processing principle: it is a kind of pressure processing, with the use of cold plastic metal at room temperature, using the rolling tool to the surface of the workpiece, the surface of the metal plastically deformed workpiece, filling the original residual indentation groove to achieve rough surface of the workpiece The value is reduced. Due to the plastic deformation of the metal, the surface is rolled to harden and refine the surface microstructure of the grains to form a dense fibrous shape, and to form residual stress, hardness and strength, and to improve the wear resistance and corrosion resistance of the surface. Regulatory. Rolling is a non-cutting plastic working.