Podcast
Questions and Answers
What type of load application can cause permanent deformation of the raceways in a ball bearing?
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?
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?
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?
What is the term used to describe the damage caused by ambient environmental vibrations in a bearing?
What is the primary reason for the formation of brownish corrosion deposits around depressions in a bearing?
What is the primary reason for the formation of brownish corrosion deposits around depressions in a bearing?
What is the term used to describe the damage caused by high-energy impacts in a bearing?
What is the term used to describe the damage caused by high-energy impacts in a bearing?
What happens to the balls or rollers in a bearing when it operates with proper lubrication and at the right speed?
What happens to the balls or rollers in a bearing when it operates with proper lubrication and at the right speed?
What occurs when a bearing is stopped and there is no EHD film?
What occurs when a bearing is stopped and there is no EHD film?
What is the primary cause of spalling in bearings?
What is the primary cause of spalling in bearings?
What is the result of spalling in bearings?
What is the result of spalling in bearings?
What is the term for the wear and corrosion pattern that mimics brinelling?
What is the term for the wear and corrosion pattern that mimics brinelling?
What is the purpose of the EHD film in a bearing?
What is the purpose of the EHD film in a bearing?
What is the primary cause of galling in a bearing?
What is the primary cause of galling in a bearing?
What is the result of metal-to-metal contact in a bearing?
What is the result of metal-to-metal contact in a bearing?
What happens when hard particles enter the bearing ringways?
What happens when hard particles enter the bearing ringways?
What is the term used to describe the transfer of metal from one surface to another in a bearing?
What is the term used to describe the transfer of metal from one surface to another in a bearing?
What is the result of rolling fatigue in a bearing?
What is the result of rolling fatigue in a bearing?
What is the term used to describe the wear caused by fine dust particles in a bearing?
What is the term used to describe the wear caused by fine dust particles in a bearing?
What is the primary cause of rust and corrosion on bearing surfaces?
What is the primary cause of rust and corrosion on bearing surfaces?
What is the characteristic of electrical pitting on a roller bearing's inner ring?
What is the characteristic of electrical pitting on a roller bearing's inner ring?
What is burnishing, and what is its effect on the bearing surface?
What is burnishing, and what is its effect on the bearing surface?
Where may electrical pitting occur on a tapered roller bearing?
Where may electrical pitting occur on a tapered roller bearing?
What is the condition under which burnishing may occur?
What is the condition under which burnishing may occur?
What is the appearance of a bearing surface that has undergone burnishing?
What is the appearance of a bearing surface that has undergone burnishing?
What is the first step to take when performing maintenance on a bearing?
What is the first step to take when performing maintenance on a bearing?
Why must bushes be measured with Precision Measuring Equipment?
Why must bushes be measured with Precision Measuring Equipment?
What is the purpose of de-magnetising a bearing?
What is the purpose of de-magnetising a bearing?
What is the requirement for the cleaning facility?
What is the requirement for the cleaning facility?
What is not allowed in the cleaning area?
What is not allowed in the cleaning area?
When must a bearing be de-magnetised?
When must a bearing be de-magnetised?
Flashcards are hidden until you start studying
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.
