Method for improving binding force of electroplated coating of surface of piston rod

Abstract

The invention discloses a method for improving the binding force of an electroplated coating of the surface of a piston rod and relates to the technical field of strengthening of surfaces of piston rods. The method includes the following steps that firstly, a common lathe is used for rough lathing; secondly, a numerical control lathe is used for finish lathing, and the surface roughness of the piston rod obtained after finish lathing is required to be Ra 0.8-1.6; thirdly, chromium plating is conducted in the surface of the piston rod processed in the second step, and the thickness ranges from 0.03 mm to 0.05 mm; and fourthly, the piston rod processed in the third step is polished, and the surface roughness of the polished piston rod is Ra 0.4. The method has the beneficial effects that the binding force of the plated coating is importantly affected through a material surface rough structure, the roughness degree of the surface is changed by reasonably designing roughness characteristics of the surface of the piston rod, the shear resisting capability of the plated coating and the surface of the piston rod is improved, and therefore the binding force of the electroplated coating on the surface of the piston rod is improved, and the strength of the surface of the piston rod is greatly improved. The method is simple in step, and the machining cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of piston rod surface strengthening, in particular to a method for improving the binding force of an electroplating layer on the surface of a piston rod. Background technique [0002] Most of the piston rod is used in the cylinder and cylinder movement actuators, which is a moving part with frequent movements and high technical requirements. Taking the hydraulic cylinder as an example, it consists of several parts: cylinder barrel, piston rod, piston, and end cover. The quality of its processing directly affects the life and reliability of the entire product. The processing requirements of the piston rod are high, and the surface roughness requirement is Ra0.4~0.8um, and the requirements for coaxiality and wear resistance are strict. [0003] Traditional hydraulic cylinder piston rod surface strengthening methods include surface ceramic hardening method, electroplating hard chromium coating, salt bath heat...

AI Technical Summary

Problems solved by technology

[0003] Traditional hydraulic cylinder piston rod surface strengthening methods include surface ceramic hardening method, electroplating hard chrome coating, salt bath heat treatment method, thermal spraying ceramic coating method, etc. Thermal spraying and electroplating are both physical attachment methods on the surface of the piston rod. A layer of anti-wear coating is formed on the surface. The bonding force between the substrate and the coating is weak and cannot bear the shear stress, so it is easy to fall off, and the plating solution pollutes the environment when the hard chromium coating is electroplated, and the heat-treated The method can only slightly improve the surface strength of the piston rod, and the distribution of the surface strength of the piston rod is uneven