波多野结无码高清中文丨97插插插丨精品国产aⅴ无码一区二区丨av解说在线观看丨午夜精品久久久久久久喷水丨成人欧美一区二区三区黑人一丨日本免费一区二区三区在线播放丨浴室人妻的情欲hd三级国产丨成人学院中文字幕丨免费国产高清毛不卡片基地丨亚洲精品网址丨日韩视频福利丨欧美在线激情丨玖玖伊人丨av不卡在线免费观看丨欧美国产一二三区丨欧美精品久久久久久久自慰丨国产精品一国产精品一k频道丨国内精品自线在拍丨亚洲自偷自拍另类12p

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.