The piston rod is the connecting part which supports the piston to do work. Most of it is used in the moving parts of oil cylinder and air cylinder. It is a moving part with frequent movement and high technical requirements. Taking hydraulic cylinder as an example, it is composed of cylinder barrel, piston rod (cylinder rod), piston and end cover. The processing quality of the tropical mould directly affects the life and reliability of the whole product. The processing requirements of piston rod are high, the surface roughness is required to be ra0.4-0.8 μ m, and the coaxiality and wear resistance are strictly required. The basic feature of the cylinder rod is the processing of the slender shaft, which is difficult to process and has been bothering the processing personnel.

The function of the piston rod is to connect the piston and crosshead, transmit the force acting on the piston and drive the piston to move.

Basic requirements for piston rod:

(1) sufficient strength, rigidity and stability;

(2) good wear resistance and high machining accuracy and surface roughness requirements;

(3) the influence of stress concentration should be minimized in structure;

(4) ensure reliable connection and prevent looseness;

(5) the structure of piston rod shall be designed to facilitate the disassembly and assembly of piston.