How to prevent the stamping fastener from being damaged?


1. When the mechanical damage is serious, the metal peeling occurs in contact with the exterior and a large area of random scratches; in general, the structural fastener damage refers to different levels of groove marks on the alloy surface of the bearing bush. The contact surface damage and ablation phenomenon exist at the same time, and the main cause of mechanical damage of the building fastener is that it is difficult to form an oil film or the oil film is seriously damaged.

  2. The plastic deformation and cold work hardening of the outer layer of the construction fasteners are carried out. Under the repeated action of the cylinder pressure impact load, the sliding construction fasteners partially lose the deformation ability, gradually form the pattern and expand continuously, and then with the wear debris falling off, The outer surface layer is formed to form a hole. Generally, when cavitation occurs in the bearing bush, the pit first appears, and then the pit gradually expands and causes cracking at the interface of the alloy layer, and the crack spreads in the parallel direction of the interface until peeling off. The main reason for the cavitation erosion of the sliding fasteners is that the oil flow is strongly disturbed due to the sudden change of the cross-section of the structural elements such as the oil groove and the oil hole, and the bubble is formed in the vacuum region where the oil flow is disordered, and then the bubble collapses due to the pressure increase. eclipse. Cavitation is generally found in high load areas of building fasteners, such as the lower bearing pads of the crankshaft main building fasteners.

  3. Fatigue pitting Due to over-loading of the engine, the fatigue and pitting of the building fasteners caused the construction fasteners to overheat and the construction fasteners to have too much clearance, resulting in fatigue damage, fatigue pitting or fatigue shedding in the middle of the building fasteners. Most of this damage is caused by overload, excessive gaps in the construction fasteners, or unclean lubricants and foreign matter mixed in the interior. Therefore, when using, care should be taken to prevent the construction fasteners from overloading. Do not operate at too low or too high speed. When idling, adjust the engine to a stable state to ensure normal construction fastener clearance and prevent engine speed from being too high or too low. Check and adjust the operation of the cooling system to ensure that the operating temperature of the engine is appropriate.