Basic requirements and performance of piston rod
May 12, 2022
The piston rod is a connecting part that supports the work of the piston when it is in use. To a certain extent, it is mostly used in the oil cylinder and the cylinder motion execution part. To a certain extent, it is a moving part with frequent movements and high technical requirements.
The piston rod is mainly composed of the end cover and the piston during operation. The quality of its processing will directly affect the life and reliability of the entire product. The processing requirements of the piston rod are high, and its surface roughness is required to be Ra0.4～ 0.8μm, strict requirements on coaxiality and wear resistance.
Basic requirements for piston rods
1. Have sufficient strength, stability and stiffness.
2. The piston rod has good wear resistance and high machining accuracy and surface roughness requirements.
3. The structure of the piston rod should minimize the influence of stress concentration.
4. Ensure reliable connection and prevent loosening
5. The design of the piston rod structure should facilitate the disassembly and assembly of the piston.
The quality of the piston rod processing will directly affect the quality of the product, so pay attention when choosing, the processing of the piston rod can improve the surface corrosion resistance, and the piston rod can delay the generation or expansion of fatigue cracks, thus improving the cylinder rod. fatigue strength.
The piston rod can be formed by rolling, and the rolling surface forms a layer of cold work hardening layer, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the surface of the cylinder rod, and avoiding the wear caused by grinding. of burns. After rolling, the reduction of surface roughness value can improve the fit properties.
There will be very critical parts in the piston rod, and its reliability during operation is directly related to the performance of the compressor. Therefore, the problem of piston rod failure is also very important. There are many reasons for the failure of the chrome-plated rod piston rod, such as defective processing, unsatisfactory heat treatment and so on.
In the process of processing, the piston rod is mainly welded by friction welding, which is very safe and environmentally friendly when used, because it has no sound, light, gas, or radiation pollution. The welding efficiency of friction welding is relatively high, it can weld one piece in two or three minutes, and the welding quality is stable and the consistency is good.
