The piston rod is a connecting component that supports the piston in doing work during use. To a certain extent, it is mostly used in oil cylinders and cylinder motion execution components, and to a certain extent, it is a frequently moving and technically demanding moving component.
The piston rod is mainly composed of the end cap and the piston during operation. The quality of its processing directly affects the service life and reliability of the entire product. The processing requirements for the piston rod are high, with a surface roughness requirement of Ra0.4-0.8 μ m, and strict requirements for coaxiality and wear resistance.
Basic requirements for piston rods
1. It should have sufficient strength, stability, and stiffness.
2. The piston rod has good wear resistance and requires high machining accuracy and surface roughness.
3. The piston rod should minimize the influence of stress concentration in its structure.
4. Ensure reliable connection and prevent looseness.
5. The design of the piston rod structure should facilitate the disassembly and assembly of the piston.
The quality of piston rod processing can directly affect the quality of the product, so when choosing, attention should be paid to the fact that processing the piston rod can improve the surface corrosion resistance, delay the generation or expansion of fatigue cracks, and thus improve the fatigue strength of the oil cylinder rod.
The piston rod can be formed by rolling, forming a cold work hardening layer on the rolling surface, reducing 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 reduction of surface roughness value can improve the fitting properties.
The piston rod contains important components, and its reliability during operation directly affects the performance of the compressor. So, the issue of piston rod failure is also highly valued. There are many reasons for the failure of chrome plated piston rods, such as processing defects, inadequate heat treatment, and so on.
The piston rod is mainly welded by friction welding during the machining process, which 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 quality of the welded product is stable and consistent.
