Precision Casting of Hydraulic Cylinder Tube


As the main components of hydraulic cylinders, mining single pillars, hydraulic supports, gun barrels and other products, the quality of the precision casting of the cylinder directly affects the life and reliability of the entire product. The cylinder has high processing requirements, and its inner surface roughness is required to be Ra0.4 ~ 0.8&um, and the requirements for coaxiality and wear resistance are strict, so precision casting is required. The basic feature of the cylinder barrel is deep hole machining, which has always troubled the processing personnel.

The precision casting process of the hydraulic cylinder barrel adopts the rolling process, because the surface layer has residual compressive stress on the surface, which helps to seal the tiny cracks on the surface and hinders the expansion of the erosion effect. Thereby, the corrosion resistance of the surface can be improved, and the generation or expansion of fatigue cracks can be delayed, thereby improving the fatigue strength of the cylinder. Through rolling forming, a layer of cold work 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 inner wall of the cylinder and avoiding burns caused by grinding. After rolling, the surface roughness value decreases, so the precision casting process of the hydraulic cylinder barrel can improve the fitting properties.