日本产挖掘机液压缸活塞杆(下称活塞杆)通常是用35号钢、45号钢或无缝钢管制成的实心杆或空心杆,其直径有φ80mm、φ75mm、φ70mm等,长为2m。为了提高其耐磨性和防锈性,活塞杆表面镀铬并抛光,其表面粗糙度为Ra0.4μm～Ra1.6μm。由于用户使用不当,活塞杆经常被划伤,造成液压油泄漏,从而影响整机的性能。活塞杆是经过精密加工的零件,一般不 Japanese-made excavator hydraulic cylinder piston rod (hereinafter referred to as the piston rod) is usually made of 35 steel, 45 steel or seamless steel pipe made of solid rod or hollow rod, the diameter of φ80mm, φ75mm, φ70mm, length of 2m . In order to improve its wear resistance and rust resistance, the piston rod surface chrome and polished, the surface roughness Ra0.4μm ~ Ra1.6μm. Due to improper use of the user, the piston rod is often scratched, resulting in leakage of hydraulic oil, thus affecting the performance of the whole machine. Piston rod is a precision machined parts, generally not