The cylinder tube is rolled. Since the surface layer retains surface residual compressive stress, it helps to seal micro cracks on the surface and hinders the expansion of corrosion. This improves the corrosion resistance of the surface and delays the occurrence or expansion of fatigue cracks, thus improving the fatigue strength of the cylinder tube. 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 tube and avoiding burns caused by grinding. After rolling, the surface roughness value is reduced, which can improve the matching properties.
Rolling processing is a kind of chip-free processing that uses the plastic deformation of metal at room temperature to smooth out the microscopic unevenness on the surface of the workpiece to achieve the purpose of changing the surface structure, mechanical properties, shape and size. Therefore, this method can achieve the two purposes of finishing and strengthening at the same time, which cannot be achieved by grinding.
No matter what processing method is used, fine uneven knife marks will always be left on the surface of the part, with staggered peaks and valleys appearing.
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