Causes and countermeasures of bearing 7 major damages

1、 Stripping

Damage status:

When the ball bearing rotates under the load again, the raceway surface or rolling surface of the inner and outer rings will show fish-like peeling phenomenon due to rolling fatigue.

reason:

Excessive load.

Poor installation (non linearity)

Moment load

Foreign matter invasion and water ingress.

Poor lubrication and inappropriate lubricant

Improper bearing clearance.

The accuracy of the bearing box is poor, and the rigidity of the bearing box is uneven

Large deflection of shaft

Rust, erosion points, scratches and indentations

(surface deformation phenomenon).

measures:

Check the size of the load and the bearing used for further study

Improve installation method

Improve sealing device and prevent rust during shutdown.

Use lubricant with proper viscosity and improve lubrication method.

Check the accuracy of the shaft and bearing housing.

Check the clearance.

2、 Card injury

Damage status:

The so-called sticking injury is the surface damage caused by the accumulation of minor burns on the sliding surface.

Linear scars in the circumferential direction of the slide surface and rolling surface.

Cycloidal scar on roller end face

The shaft ring surface close to the roller end face is jammed.

reason:

Excessive load and preload.

Poor lubrication.

Foreign matter bite.

Inclination of inner ring and outer ring, deflection of shaft.

The accuracy of shaft and bearing box is poor.

measures:

Check the size of the load.

The preload shall be appropriate.

Improve lubricants and lubrication methods.

Check the accuracy of shaft and bearing box.

3、 Abrasion

Damage status:

The so-called scratch refers to the surface damage caused by the aggregation of small burns caused by the sliding of rolling and the thermal cracking of oil film. Produce surface roughness with adhesion.

reason:

High speed light load

Rapid acceleration and deceleration

Improper lubricant.

Water intrusion

measures:

Improve preloading

Improve bearing clearance

Use lubricant with good oil film

Improve lubrication method

Improve sealing device

4、 Fracture

Damage status:

The so-called fracture refers to a small part of the fracture due to the impact or excessive load on the local part of the rib or roller angle of the raceway wheel.

reason:

It was hit during installation.

Excessive load.

Poor use such as falling.

measures:

Improve the installation method (using hot installation and proper tool clamp).

Correct the load conditions.

The bearing is installed in place so that the retaining edge is supported.

5、 Indentation

Damage state

Dents on raceway surface or rotating surface when small metal powder and foreign matter are bitten.

Because of the impact during installation, a concave surface (Brinell hardness indentation) is formed on the spacing of the rolling element.

reason:

Foreign matters such as metal powder bite.

The impact load received during assembly or transportation is too large.

measures:

Impact the shaft sleeve.

Improve sealing device.

Filter the lubricating oil.

Improve assembly and use methods.

6、 Burns

Damage status:

The raceway wheel, rolling body and cage heat rapidly during rotation until discoloration, softening, deposition and damage occur.

reason:

Poor lubrication.

Excessive load (excessive preload).

The speed is too high.

The clearance is too small.

Invasion of water and foreign matters.

The accuracy of shaft and bearing box is poor, and the deflection of shaft is large.

measures:

Study lubricants and lubrication methods.

Correct the bearing selection.

Study the fit, bearing clearance and preload.

Improve sealing device.

Check the accuracy of the shaft and bearing housing.

Improve the installation method.

7、 Rust, corrosion

Damage status:

Rust and corrosion of bearings include pit rust on the surface of raceway wheel and rolling body, and overall rust and corrosion.

reason:

The invasion of water and corrosive substances (paint, gas, etc.).

The lubricant is not suitable.

Water droplets are attached due to condensation of water vapor.

Stop running in case of high temperature and humidity.

Poor rust prevention during transportation.

Improper storage status.

Improper use.

measures:

Improve sealing device.

Study the lubrication method.

Antirust measures during shutdown.

Improve storage methods.

Pay attention when using.