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Contact fatigue failure refers to failure caused by alternating stress on the working surface of the bearing. Contact fatigue spalling occurs on the working surface of NTN bearings, and is often accompanied by fatigue cracks. It first occurs from the maximum alternating shear stress below the contact surface, and then expands to the surface to form different spalling shapes, such as pitting or pitting spalling. , peeling off into small flakes is called shallow peeling. Due to the gradual expansion of the peeling surface, it often extends to deep layers, forming deep peeling. Deep spalling is a fatigue source of contact fatigue failure.

The critical speed of a steam turbine refers to the maximum speed that the rotor can withstand. When it reaches a certain value, the vibration will reach a certain level and cause a state of torsional vibration. Understanding critical speed is critical to the design, operation and maintenance of steam turbines. The calculation and control of critical speed directly affect the safety, stability and operating efficiency of steam turbine.

Raw material preparation The first step in sliding bearing processing is to select suitable raw materials. Steel materials are usually used, such as high carbon steel, low carbon steel, etc. When selecting materials, you need to consider the load, friction, wear and other factors that the bearing will bear to select appropriate materials.

Stainless steel has the ability to resist atmospheric oxidation---that is, stainless steel, and also has the ability to resist corrosion in media containing acids, alkali, and salt---that is, corrosion resistance. However, its corrosion resistance changes with the chemical composition of the steel itself, its additive state, usage conditions and environmental medium types. Like 304 steel pipes, in the atmosphere of dry cleansing, absolute good resistant to tarnishing ability is arranged. But if it is moved to riviera, in containing the sea fog of a large amount of salts, will soon get rusty; 316 steel pipes show excellent corrosion resistance. good. Therefore, not any kind of stainless steel can resist corrosion and rust in any environment.

Bearings are key components in mechanical operation, and their material selection directly affects their performance. In different fields, the bearing materials used are also different. The following is a detailed analysis of the classification and performance requirements of commonly used bearing materials.