The piston rod is a connecting component that supports the piston to do work. It is mostly used in oil cylinders and cylinder motion execution components, and is a frequently moving and technically demanding moving component. Taking a hydraulic cylinder as an example, it consists of several parts: cylinder barrel, piston rod (cylinder rod), piston, and end cap. The quality of its processing directly affects the lifespan and reliability of the entire product. The processing requirements for piston rods are high, with a surface roughness requirement of Ra0.4-0.8 μ m, and strict requirements for coaxiality and wear resistance. The basic characteristic of the oil cylinder rod is the processing of a slender shaft, which is difficult to process and has always troubled the processing personnel.