peel off

Damage state: When the bearing is subjected to load rotation again, the raceway surfaces or rolling surfaces of the inner and outer rings exhibit a fish scale peeling phenomenon due to rolling fatigue. Reason: Excessive load. Poor installation (non-linear) of torque load, foreign object intrusion, and water ingress. Poor lubrication, inappropriate lubricant, and inadequate bearing clearance. Poor precision of the bearing box, uneven rigidity of the bearing box, and large deflection of the shaft caused by rust, erosion points, scratches, and indentation (surface deformation phenomenon).

Measures: Check the size of the load and re study the installation method of the bearings used to improve the sealing device and prevent rust during shutdown. Use lubricants of appropriate viscosity and improve lubrication methods. Check the accuracy of the shaft and bearing housing. Check the clearance.

flay

Damage status: presents a dark surface with slight wear, with multiple tiny cracks ranging from 5-10m deep from the surface to the inside, and small detachment (micro peeling) occurring over a large area. Reason: inappropriate lubricant. Foreign objects have entered the lubricant. Poor lubricants result in rough surfaces. The surface smoothness of the paired rolling parts is poor.

Measure: Select lubricants to improve the sealing device and enhance the surface smoothness of paired rolling parts.

Card injury

Damage status: The so-called stuck injury is a surface damage caused by the accumulation of small burns on the sliding surface. Linear scars on the sliding surface and rolling surface in the circumferential direction. The cycloidal shaped scar on the roller end face is close to the shaft ring surface of the roller end face.

Reason: Excessive load, excessive preloading. Poor lubrication. Foreign objects bite in. The inclination of the inner and outer rings, and the deflection of the shaft. The accuracy of the shaft and bearing box is poor.

Measure: Check the size of the load. Preloading should be appropriate. Improve lubricants and lubrication methods. Check the accuracy of the shaft and bearing box.

fracture

Damage state: The so-called fracture refers to the partial fracture of a small part due to the application of impact or excessive load to the local part of the retaining edge or roller angle of the raceway wheel.

Reason: It was hit during installation. Excessive load. Poor use such as falling.

Measure: Improve installation methods (using hot installation and appropriate tool clamps). Correct the load conditions. The bearing is installed in place to support the retaining edge.

Cracks, fissures

Damage state: The so-called crack refers to the damage caused by cracks in the raceway wheel or rolling element. If continued to be used, it will also include cracks that develop.

Reason: Excessive interference. Excessive load, impact load. Stripping has developed. Heating and micro vibration wear caused by the contact between the raceway wheel and the installation components. Heat generated by creep. Poor cone angle of the cone shaft. Poor cylindricity of the shaft. The fillet radius of the shaft step is larger than that of the bearing chamfer, causing interference with the bearing chamfer.

Measure: Adequate interference fit. Check the load conditions. Improve installation methods. The shape of the shaft should be appropriate.

indentation

Damage status: dents formed on the raceway surface or rotating surface when metal powder, foreign objects, etc. are bitten in. Due to impact during installation, concave surfaces (Brinell hardness indentations) were formed on the spacing between the rolling elements.

Reason: Foreign objects such as metal powder bite in. Excessive impact load during assembly or transportation.

Measure: Impact the shaft sleeve. Improve the sealing device. Filter lubricating oil. Improve assembly and usage methods.

Installation scars

Damage status: Axial linear scars caused on the raceway surface and rolling surface during installation and disassembly

Reason: The inclined installation of the inner and outer rings during installation and disassembly, as well as the impact load during disassembly.

Measure: Use appropriate tools to use the stamping machine to prevent impact loads. Centering between each other during installation.

change color

Damage status: Due to temperature rise, lubricant reaction, etc., discoloration of raceway wheels, rolling elements, and retainers.

Reason: Poor lubrication. The reaction with the lubricant causes hot oil immersion. The temperature has risen significantly.

Measure: Improve lubrication methods.