Rolling processing, due to the surface residual compressive stress on the surface layer, contributes to the closure of the surface micro cracks and hinders the expansion of the erosion effect. Thereby, the surface corrosion resistance is improved, and the generation or expansion of the fatigue crack can be delayed, thereby increasing the fatigue strength of the cylinder. By rolling forming, the rolling surface forms a cold hardening 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 value is reduced to improve the compounding property.
The oil cylinder is the main component of the construction machinery. The traditional processing method is : the broaching cylinder body - the fine cylinder block - the grinding cylinder block. The rolling method is: broaching cylinder--fine cylinder--rolling cylinder, the process is 3 parts, but the time comparison: grinding the cylinder 1 meter in about 1-2 days, rolling The cylinder is about 1-30 meters in about 10-30 minutes. Input contrast: grinding machine or honing machine (tens of thousands - millions), rolling knives (1 仟 - tens of thousands). After rolling, the surface roughness of the hole is reduced from Ra3.2~6.3um before the rolling to Ra0.4~0.8&um, 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%. If the service life of the cylinder is only considered to be 2~3 times, the boring rolling process is about 3 times more efficient than the grinding process. The above data shows that the rolling process can greatly improve the surface quality of the cylinder.
After the cylinder is rolled, there is no sharp micro-edge on the surface, and long-term motion friction will not damage the seal or seal. This is especially important in the hydraulic industry.
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