The quilted tube for oil cylinder is processed by rolling, 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 erosion. Therefore, 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 quilted mill. 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 quilting tube and avoiding burns caused by grinding. . After rolling, the reduction of surface roughness value can improve the fit properties.
The principle of cylinder tube rolling processing: it is a pressure finishing process, which uses the cold plastic characteristics of the metal at room temperature, and uses the rolling tool to apply a certain pressure to the surface of the workpiece, so that the metal on the surface of the workpiece produces plastic flow and is filled into the workpiece. The original residual low concave trough, while the workpiece surface roughness value is reduced. Due to the plastic deformation of the rolled surface metal, the surface structure is cold hardened and the grains are thinned, forming a dense fibrous shape, and forming a residual stress layer, the hardness and strength are improved, thereby improving the wear resistance and corrosion resistance of the workpiece surface. Sex and cooperation. Rolling is a non-cutting plastic processing method.
Cylinder tube rolling is a chip-free process that uses the plastic deformation of metal at room temperature to flatten the microscopic unevenness of the workpiece surface to achieve the purpose of changing the surface structure, mechanical properties, shape and size. Therefore, this method can achieve two purposes of finishing and strengthening at the same time, which cannot be achieved by grinding.
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