Introduction To The Rolling Process Of Precision Piston Rods

Precision piston rods are mainly used for piston rods in hydraulic pneumatics, engineering machinery, and automobile manufacturing. It is processed by rolling, because the surface layer has residual compressive stress on the surface, which is conducive to the formation of small cracks on the surface.

closed, hindering the expansion of erosive action. 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 cylinder rod. 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 surface of the cylinder rod and avoiding burns caused by grinding. After rolling, the reduction of surface roughness value can improve the fit properties. At the same time, the friction damage to the seal ring or the seal when the precision piston rod moves is reduced, and the overall service life of the product is improved.

The rolling process is a high-quality process measure. After rolling, the surface roughness of the precision piston rod is reduced from Ra3.2 ~ 6.3μm before rolling to Ra0.4 ~ 0.8μm, and the surface hardness is increased by about 30%.

Surface fatigue strength increased by 25%. The service life of the product is increased by 2 to 3 times, and the rolling process is about 15 times more efficient than the grinding process. The above data shows that the rolling process can greatly improve the surface quality of the product.