As the main components of hydraulic cylinder, mining single prop, hydraulic support and barrel, the quality of cylinder will directly affect the life and reliability of the whole product. The cylinder cylinder has a high processing requirement and its inner surface roughness is Ra0.4 ~ 0.8&um, which requires strict coaxiality and wear resistance. The basic feature of cylinder is deep hole processing, and its processing has been puzzling the processing personnel.
Because of the surface residual compressive stress in the surface layer, it is helpful to seal the small surface cracks and prevent the expansion of the erosion. Thus, the corrosion resistance of the surface can be improved, and the fatigue crack can be delayed and the fatigue strength of the cylinder can be improved. Through rolling forming, a cold hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the cylinder wall, and avoiding the burn caused by grinding. After rolling, the decrease of the surface roughness value can improve the matching property.