The principle of precision chrome plated steel bar

- Jul 23, 2019-

Precision chrome plated steel bar process principle, the current piston rod piston rod discoloration, mainly the following three hydraulic systems have high temperature phenomenon, the piston rod in the high temperature state (especially in the cold season) frequently in contact with the low temperature environment (temperature sudden dip) During the maintenance cycle, the hydraulic oil for the excavator is not replaced. This phenomenon usually occurs when the piston rod is discolored within a few days of the oil change.


Hydraulic cylinders are important actuators in hydraulic systems for performing reciprocating motion and are widely used in construction machinery. Hydraulic cylinder piston rod is an important part of hydraulic cylinder. It is usually made of solid rod or hollow rod with 35, 34 or seamless steel pipe. In order to improve the anti-corrosion of wear resistance, the traditional domestic process is hard chrome plating (plating). The thickness is 0.02 - 0.05 mm) and polished, and the surface roughness Ra is 1.6 - 0.4 μm.


The precision piston rod adopts rolling processing to improve the surface corrosion resistance and delay the generation or expansion of fatigue cracks, thereby improving the fatigue strength of the cylinder rod. 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 cylinder rod surface and avoiding burns caused by grinding. After rolling, the surface roughness value is reduced to improve the compounding property.