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Coal Vertical Roller Mill

Failure form and cause of Coal Vertical Roller Mill roller bearing

1. Contact fatigue failure

The working surface of the Coal Vertical Roller Mill bearing is subjected to alternating stress and causes failure. It mainly occurs on the working surface of the bearing, often accompanied by fatigue cracks, which are first generated from the maximum alternating shear stress below the contact surface and then extended to the surface to form different peeling shapes. Its formation process and consequences are: pitting - pitting peeling - shallow spalling - deep exfoliation.

2, wear and tear failure

Coal Vertical Roller Mill mill bearing wear failure refers to the failure caused by the relative sliding friction between the surfaces causing the wear of the metal on the working surface. Wear failure is generally classified into abrasive wear and adhesive wear in the form of wear. Abrasive wear refers to wear caused by the intrusion of foreign hard particles or hard foreign matter or metal surface between the working surface of the bearing and the relative sliding of the contact surface. Adhesive wear refers to uneven friction of the friction surface due to microscopic protrusions or foreign matter on the friction surface. When the lubrication condition is seriously deteriorated, local friction occurs due to local friction, which may cause local deformation of the friction surface and friction micro-welding. The surface metal may be partially melted, and the force on the contact surface tears the local friction weld from the substrate to increase plastic deformation.

When wear failure occurs, firstly, there is continuous wear on the surface of the Coal Vertical Roller Mill bearing, resulting in gradual damage of the bearing parts, further causing loss of bearing dimensional accuracy and other related problems. Its formation process and consequences are: wear-shape change - matching gap increase and work surface topography change - lubricant contamination - complete loss of lubrication function - bearing loss of rotation accuracy or even normal operation.

3, fracture failure

This failure is mainly caused by two major factors: overload and defects. An overload fracture occurs when the load exceeds the strength limit. Defects such as microcracks, shrinkage cavities, air bubbles, large foreign matter, overheated tissue and localized burns in the bearing parts of the Coal Vertical Roller Mill will also cause breakage at the defect during impact overload or severe vibration.

4 Coal Vertical Roller Mill bearing clearance change failure

This kind of failure is often caused by the combination of internal and external factors. When this failure occurs, the first is to match the gap change, and then the accuracy of the bearing of the established mill is reduced, resulting in the phenomenon of “bite death”. The external factors mainly refer to over-interference, insufficient installation, temperature rise and expansion, instantaneous overload, etc.; internal factors mainly include residual austenite and residual stress in an unstable state.

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