Bearing Damage: Brinelling and Vibration

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of load application can cause permanent deformation of the raceways in a ball bearing?

Improper bearing handling

Excessive vibration during transport

Ambient environmental vibrations

Load exceeding the elastic limits of the steel (correct)

What is the term used to describe the formation of measurable dents at each ball location in a bearing?

Vibration Brinelling

Shipping Brinelling

Brinelling (correct)

False Brinelling

What is the purpose of the oil film in an operating bearing?

To create an elasto-hydro-dynamic film

To reduce friction (correct)

To prevent corrosion

To increase the load-carrying capacity

What is the term used to describe the damage caused by ambient environmental vibrations in a bearing?

False Brinelling Signup and view all the answers

What is the primary reason for the formation of brownish corrosion deposits around depressions in a bearing?

Wear caused by grinding corrosion oxide Signup and view all the answers

What is the term used to describe the damage caused by high-energy impacts in a bearing?

High-Energy Impact Damage Signup and view all the answers

What happens to the balls or rollers in a bearing when it operates with proper lubrication and at the right speed?

They lift off the raceway slightly Signup and view all the answers

What occurs when a bearing is stopped and there is no EHD film?

There is metal-to-metal contact Signup and view all the answers

What is the primary cause of spalling in bearings?

Cyclic loading Signup and view all the answers

What is the result of spalling in bearings?

The bearing surface becomes pitted and cracked Signup and view all the answers

What is the term for the wear and corrosion pattern that mimics brinelling?

False brinelling Signup and view all the answers

What is the purpose of the EHD film in a bearing?

To protect and lubricate the bearing Signup and view all the answers

What is the primary cause of galling in a bearing?

Metal-to-metal contact and welding action Signup and view all the answers

What is the result of metal-to-metal contact in a bearing?

Galling and wear of the bearing surface Signup and view all the answers

What happens when hard particles enter the bearing ringways?

The particles cause roughness of the ring and ball, leading to failure Signup and view all the answers

What is the term used to describe the transfer of metal from one surface to another in a bearing?

Galling Signup and view all the answers

What is the result of rolling fatigue in a bearing?

Flaking of the bearing material Signup and view all the answers

What is the term used to describe the wear caused by fine dust particles in a bearing?

Wear due to lapping compound Signup and view all the answers

What is the primary cause of rust and corrosion on bearing surfaces?

Water in the lubricant Signup and view all the answers

What is the characteristic of electrical pitting on a roller bearing's inner ring?

Corrugation of the raceway surface Signup and view all the answers

What is burnishing, and what is its effect on the bearing surface?

Smoothing of surface roughness, with no measurable wear Signup and view all the answers

Where may electrical pitting occur on a tapered roller bearing?

At the middle of the rolling contact surfaces Signup and view all the answers

What is the condition under which burnishing may occur?

During periods of marginal lubrication Signup and view all the answers

What is the appearance of a bearing surface that has undergone burnishing?

Discoloured Signup and view all the answers

What is the first step to take when performing maintenance on a bearing?

Refer to the maintenance manual for guidance Signup and view all the answers

Why must bushes be measured with Precision Measuring Equipment?

To check for dimensional accuracy Signup and view all the answers

What is the purpose of de-magnetising a bearing?

To remove ferrous particles from the bearing Signup and view all the answers

What is the requirement for the cleaning facility?

Ventilation and fire equipment Signup and view all the answers

What is not allowed in the cleaning area?

Eating or drinking Signup and view all the answers

When must a bearing be de-magnetised?

At the latest prior to final cleaning Signup and view all the answers

Study Notes

Bearing Defects

Brinelling: False brinelling is caused by ambient vibration, resulting in brownish corrosion deposits around depressions, and can occur in brand-new bearings exposed to environmental vibrations for an extended period.
Spalling: The breakdown of surfaces due to cyclic loading, resulting in fatigue of the metal at localised points, appearing as irregular pitting with cracked edges.
Galling: Occurs when the rolling element of the bearing skids, resulting in metal-to-metal contact and the transfer of metal from or to either surface.
Flaking: Small pieces of bearing material split off from the smooth surface of the raceway or rolling elements due to rolling fatigue, creating regions with a rough texture.

Additional Defects

Wear: Caused by dirt and hard particles getting into the bearing ringways, causing roughness of the ring and ball, and eventually leading to failure.
Rust and Corrosion: Pits on the surface of rings and rolling elements, caused by water in lubricant.
Electrical Pitting: Corrugation of the raceway surface, applying to the roller bearings' inner ring.
Burnishing: Smoothing of the original surface roughness in the bearing races, resulting from mechanical rolling over during normal running.

Bearing Inspection and Maintenance

Inspecting Rolling Element Bearings: No attempt should be made to clean or remove grease from the bearing during inspection.
Cleaning: Takes place in a clean and tidy facility, with no eating or drinking allowed, and personal protective equipment (PPE) must be used.
De-magnetising: Bearings must be de-magnetised at the latest prior to final cleaning to remove ferrous particles attracted to the balls, rollers, or races.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz covers the causes and effects of brinelling and vibration on ball bearings, including the signs of wear and corrosion. Learn about the damage that can occur during transportation and usage. Understand how to identify and prevent these issues in bearings.