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Shanghai Shang Shaft Bearing Quality Inspection Institute Co., Ltd.

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Address: 301 Shangxue Road, Jiading District, Shanghai

Rolling bearing failure mode-wear

2021-12-01 15:01

abrasive wear

abrasive wear(Particulate abrasion;three-body wear) isExistencehard particlesWhen material is lost due to sliding, when a hard surface or particle slides over another surface, by cutting orfurrowaction to remove material from the surface.Some darkening of the surface after wear, The thickness and characteristics of the abrasive particles are different, and the degree of darkening is different. Due to the rotating surface, and possibly the material on the cage is worn away, the number of abrasive particles gradually increases, and eventually the wear enters an accelerated process, resulting in bearing failure.

Although the surface will generally have a certain degree of darkening,Occurs when the grit is very finePolishingEffect,formVery bright surface.

adhesive wear

 

adhesive wearYesTransfer of material from one surface to another, and accompanied by friction heating, sometimes accompanied by surface tempering or re-quenching. This process creates local stress concentrations and can lead to cracking or spalling in the contact zone.

 

In the case of insufficient lubrication, when sliding occurs and the local temperature rise caused by friction causes the contact surface to stick.Smear(Sliding injury,Bonding,Scratch,coarsening), resulting in material transfer. If the rolling bodies are underloaded and are subjected to strong acceleration when they re-enter the bearing zone, smearing often occurs between the rolling bodies and the raceway. Occurrence in the case of severe smearingBite Sticky. In contrast to the gradual accumulation process of abrasive wear, smearing often occurs abruptly.

Due to insufficient lubrication, smearing can also occur on the rib face and the roller end face. In the case of bearings filled with rolling elements (without cage), smearing also occurs at the contact between the rolling elements, depending on the lubrication and rotation conditions.

If the bearing ring is installed on the shaft or in the bearing seat, insufficient clamping force causes the ring to move relative to its bearing surface (peristalsis), smearing will occur on the bearing inner diameter surface, outer diameter surface or shaft, bearing seat hole supporting surface (also knowngluing). Because there is a small difference between the diameters of the two parts, there is also a small difference in their circumferences. Thus, a radial load with respect to the rotation of the ferrule causes the two parts to come into contact at a series of successive points, with the two contacting parts rotating relative to each other at a slight differential speed. This rolling movement of the ferrule relative to its bearing surface with a slight difference in rotational speed is called "creep".

 

When creep occurs, the rough peaks in the contact area between the ferrule and the bearing surface are rolled and crushed, giving the ferrule surface a bright appearance. In the process of peristalsisRolling often occurs, but not always with the collar and bearing surface contact sliding, so can also see other damage, such as scratch marks, fretting and wear.Under certain load-bearing conditions, when the amount of interference between the ferrule and the bearing surface is not large enough,fretting abrasionPrimary.

 

 

In addition, when the radial clearance fit is adopted, creeping will also occur between the end face of the ferrule and its axial adjacent surface, resulting in lateralhot crackinglines, eventually causing cracking of the ferrule.