A part of the dynamic surface material of the bearing falls off like fish scales, which is called fatigue peeling During the operation of dynamic bearings, they bear a certain load, even static loads. However, for steel balls and raceways, their stress is cyclic and reciprocating, causing the material to experience dynamic fatigue and reaching the end of the bearing's lifespan. In addition, there are several different definitions of bearings; Lifespan” One of them is the so-called“ Working lifespan; It represents a certainneedle roller bearingThe actual lifespan that can be achieved before damage is caused by wear and tear. Damage is usually not caused by fatigue, but by wear, erosion, seal damage, and other reasons.
However, whether in laboratory experiments or practical use, it can be significantly observed that bearings with the same appearance under the same working conditions have significantly different actual lifespans.
The life cycle of a bearing (or the number of hours it operates at a certain speed) is defined as the initial fatigue damage (peeling or missing) that occurs on any bearing ring or dynamic body of a needle roller bearing within this life cycle. There are many reasons why most bearings are damaged due to various factors; — Exceeding the originally estimated load, ineffective sealing, and insufficient bearing clearance caused by tight fit.
      Any of these factors has its own unique damage pattern and will leave special marks of damage. Therefore, when examining damaged bearings, possible causes can be identified in most cases. Generally speaking, one-third of needle roller bearing damage is caused by fatigue damage, another one-third is caused by poor lubrication, and the remaining one-third is caused by pollutants entering the bearing or improper installation and handling.
However, these types of damage are also related to the industry. For example, in the pulp and paper industry, bearing damage is mostly caused by poor lubrication or pollution rather than material fatigue.
Large metal noise
  Reason 1: Abnormal load. Countermeasures: Adjust the fit, study the bearing clearance, adjust the load, and correct the position of the outer shell shoulder.
  Reason 2: Poor installation. Countermeasures: Improve the machining accuracy of the shaft and housing, and improve the installation accuracy and method.
  Reason 3: Insufficient or unsuitable lubricant. Countermeasure: Supplement lubricant and choose appropriate lubricant.
  Reason 4: There is contact between rotating parts. Countermeasure: Modify the contact part of the curved seal.  
Rule noise
  Reason 1: Due to foreign objects causing indentation, rust or scratches on the rolling surface, countermeasures include replacing bearings, cleaning relevant parts, improving sealing devices, and using clean lubricants.  
  Reason 2: Surface deformation after steel carburizing. Countermeasure: Replace the bearing and pay attention to its use.
  Reason 3: Peeling of the raceway surface. Countermeasure: Replace the needle roller bearing.
Irregular noise
    Reason 1: Excessive clearance. Countermeasure: Study the fit and bearing clearance, and modify the preload amount.
    Reason 2: Foreign object intrusion. Countermeasures: Study the replacement of bearings, clean relevant parts, improve sealing devices, and use clean lubricants.
    Reason 3: Spherical damage and peeling. Countermeasure: Replace the bearing.
Abnormal temperature rise
    Reason 1: Excessive lubricant. Countermeasure: Reduce lubricant, use in moderation, and choose harder lubricating grease.
    Reason 2: Insufficient or unsuitable lubricant. Countermeasure: Supplement lubricant and choose appropriate lubricant.
    Reason 3: Abnormal load. Countermeasures: Modify the fit, study the clearance of the bearing, adjust the preload, and modify the shoulder position of the housing.  
    Reason 4: Poor installation. Countermeasure: Improve the machining accuracy, installation accuracy, and installation method of the shaft and housing.
    Reason 5: Creep of the mating surface and excessive friction of the sealing device. Countermeasure: Replacementneedle roller bearingResearch cooperation, modify the shaft and housing, and change the sealing form.
Large vibration (shaft jumping)
    Reason 1: Surface deformation after steel carburizing. Countermeasure: Pay attention to bearing replacement operation.
    Reason 2: Stripping, countermeasure: Replace the bearing.
    Reason 3: Poor installation. Countermeasure: Modify the right angle of the shaft, housing shoulder, and pad side.  
    Reason 4: Foreign object intrusion. Countermeasures: Replace bearings, clean various parts, improve sealing devices, etc.
Excessive lubricant leakage and discoloration
  Reason: Excessive lubricant, foreign object invasion, wear powder producing foreign objects, etc. Countermeasure: Use lubricant in moderation, study the selection of lubricant, study the replacement of needle roller bearings, and clean the housing.