There are many sliding friction pairs in the hydraulic excavator. Because the sliding friction pairs of the excavator bear heavy loads and the working conditions are relatively bad, the relative sliding friction pairs are easy to fail. However, most of the failures are not fractures, but different forms of wear on the contact surface or surface. In view of the fact that the excavator pin shaft is prone to adhesive wear and fatigue wear, we use high-strength alloy structural steel 42C; M as the pin material after quenching and tempering, surface after high-frequency quenching, EDM surface strengthening, the surface is deep . The white tungsten-cobalt hard alloy reinforced layer of 1~.3 has a hardness of up to HRC74 or higher. by. The processing efficiency is very close to that of the NX154 blade special machine produced by Swiss STELARG. Use the on-line machining accuracy measurement function of this machine to measure the G106-level guide vanes and the blade shape file. A hard alloy having a higher hardness is used as the tool electrode 11, and the pin 12 is used as a negative electrode to alternately short-circuit and open the surface of the positive and negative electrodes to perform electric pulse discharge. The energy stored on the capacitor in the C line forms the spark or tool name and specification. The cutting amount is the number of the process name. The cutting speed is the roughing degree. The concave arc 50 square shoulder iron knife rough processing back arc 50 square shoulder iron knife rough machining concave arc two Side entry and exit side 32 corn milling cutter concave arc clear root 16 ball end milling cutter back arc clear root 32 corn milling cutter finishing steam channel 32 copy milling cutter comparison machining error is 0.02mm to achieve high machining accuracy. Subsequently, free-form surface parts such as the overall marine propeller are machined. (Editor Ming Tao) Engineers are mainly engaged in the research and development of parallel machine tools. (Finish) Single Row Cylindrical Roller Bearing Cylindrical Roller Bearing，Single Row Cylindrical Roller Bearing，Sealed Cylindrical Roller Bearings LUOYANG AUTO BEARING CO.,LTD , https://www.lyautobearing.com