How Is The Cylinder Of The Hydraulic Cylinder Processed?

As the main components of hydraulic cylinders, mining single pillars, hydraulic supports, gun barrels and other products, the quality of its processing 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. The basic feature of the cylinder barrel is deep hole machining, which has always troubled the processing personnel.

The rolling process, because the surface layer has residual compressive stress on the surface, helps to seal the tiny cracks on the surface and hinders the expansion of erosion. 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 roll forming, a cold work hardened 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 reduction of surface roughness value can improve the fit properties.

The oil cylinder is the most important part of construction machinery. The traditional processing method is: broaching cylinder block - fine boring cylinder block - grinding cylinder block. The rolling method is: broaching cylinder block - fine boring cylinder block - rolling cylinder block, the process is 3 parts, but the time comparison: grinding cylinder block 1 meter in about 1-2 days, rolling The cylinder body is 1 meter in about 10-30 minutes. Input comparison: grinder or quilting machine (tens of thousands - millions), rolling knives (1 thousand - tens of thousands). After rolling, the surface roughness of the hole is reduced from Ra3.2-6.3um to Ra0.4-0.8&um before rolling, the surface hardness of the hole is increased by about 30%, and the fatigue strength of the inner surface of the cylinder is increased by 25%. The service life of the oil cylinder is increased by 2 to 3 times if only the influence of the cylinder is considered, and the efficiency of the boring and rolling process is about 3 times higher than that of the grinding process. The above data shows that the rolling process is efficient and can greatly improve the surface quality of the cylinder.

After the cylinder is rolled, there are no sharp tiny edges on the surface, and long-term motion friction will not damage the seal ring or seal, which is particularly important in the hydraulic industry.