色永久第一色_精品日韩人妻一区二区_国产同性恋精品无码视频_亚洲av日韩av偷拍偷拍_亚洲嫩草AV永久无码_性爱视频一区二区免费看_91啪啪精品_黄色视频A片区_国产91啪视频好日子_一区二区三区大香蕉_亚洲无线观码_人操欧美视频_诱人熟女亚洲_久久久久,黄色一级片_av嫩草

The precision piston rod is selected for rolling production processing because the surface layer leaves residual compressive stress, which is conducive to the sealing of small surface cracks and hinders the expansion of sedimentation. Furthermore, the corrosion resistance of the surface layer can be improved, and the precision piston rod can slow down the formation or expansion of fatigue cracks, thus increasing the fatigue limit of the hydraulic cylinder rod. According to rolling forming, layers of cold work hardening layers are generated on the surface of the rolling, reducing the ductility and plastic deformation of the cutting pair's contact surface, thereby improving the wear resistance of the product surface and avoiding burns caused by cutting. After rolling, the decrease in roughness value can enhance the mutual matching characteristics. Together, it reduces friction damage to sealing rings or hydraulic seals during the movement of precision piston rods, and increases the overall service life of hydraulic cylinders.