What is the processing technology of piston rod?

The piston rod is produced by rolling, because the residual compressive stress in the surface layer is left in the surface layer, which is conducive to the closure of the micro cracks in the surface layer and hinders the development of sedimentation. In order to improve the surface corrosion resistance, the piston rod can slow down the fatigue crack or expansion, so as to improve the fatigue limit of the hydraulic cylinder rod. According to the rolling forming, a layer of cold work hardening layer is produced on the rolling surface layer, which reduces the ductility and plastic deformation of the cutting pair touching the surface layer, thus improving the wear resistance of the surface layer of the hydraulic cylinder rod and preventing the scald caused by cutting. After rolling, the reduction of roughness value can improve the matching characteristics. Together, the friction damage to the seal ring or hydraulic seal is reduced when the rod piston of the hydraulic cylinder moves, and the overall service life of the hydraulic cylinder is improved.

Rolling process is a high-quality processing strategy. Taking the 165 mm diameter mirror doctor's cutting rolling head (46 steel seamless pipe) as an example, the actual effect of material rolling is proved. After rolling, the roughness of hydraulic cylinder rod is reduced from ra3.4 ~ 6.3um to ra0.3 ~ 0.7um, the surface strength of hydraulic cylinder rod is increased by 40%, and the fatigue limit of hydraulic cylinder rod is increased by 20%. The service life of the hydraulic cylinder is increased by 2-3 times, and the rolling process is 16 times more efficient than the cutting process. The statistical data show that the rolling process is efficient and can greatly improve the process performance of hydraulic cylinder rod.