Contact fatigue failure means the bearing working surface subjected to alternating stress and failure. Contact fatigue spalling in bearing working surface, often accompanied by fatigue crack, first from the contact surfaces of the following maximum alternating shear stress, and then extended to the surface flakes of different shapes, such as point-like pitting corrosion or pitting flaking, Peel into small pieces called a shallow flake.
Wear failure means relative to the surface of sliding friction causes wear of its surface constantly arising out of failure. Continuous wear and tear will cause bearing damage gradually, and eventually lead to loss of precision bearing size and other related issues. Wear can affect the shape change, increased clearance and surface morphology changes may affect the lubricants or lubrication function caused by pollution reaches a certain level and make it a complete loss, thus depriving the Oilless bearing rotation precision and is not functioning properly. Wear failure is one of the common failure modes of all kinds of bearings, worn forms can generally be classified into the most common abrasive and adhesive wear of wear.
1. the oil film resistance diagnosis technology
Features: different working conditions you can use the same judging criteria. Indentation, cracks and other surface spalling, differential diagnosis of abnormal results.
Range of application: for Rotary shaft exposed applications.
2. vibration diagnosis
Features: vibration diagnosis technology application wide enables online monitoring diagnostic, diagnosis theory has matured.
Application: particularly suitable for bearing fault monitoring of rotating machinery.
3. the technique of ferrographic diagnosis
Features: machines without disintegration; low investment, the effect is good; to find oil-free bearing early fatigue failure; to do research on wear mechanism.
Range of application: applied to fault diagnosis of bearings are lubricated by lubricating oil, grease lubricated bearings for more difficult.
4. temperature diagnosis technique
Feature: diagnosing simple; bearing burns to judge better.
Application: apply to simple routine diagnostic machine bearing.
5. optical fiber monitoring and diagnosis technology
Features: fiber-optic displacement sensor with high sensitivity; extract signals directly from oil-free bearing surface, improves signal-to-noise ratio; could directly reflect the degree of manufacturing quality, surface wear, bearing loads, lubrication and clearance.
Application: applied to sensors can be installed in housings of machines.
6. acoustic emission diagnosis technology
Features: diagnostic fast, easy online monitoring.
Range of application: development of new technologies in recent years, less bearing condition monitoring application.
Directly with your hand when taking oil-free bearing, to fully wash away sweat on his hand, and coated with high quality mineral oil before operation, paying particular attention to rust in the rainy season and summer. In some special operating conditions, calculation of bearings can be obtained more than traditional life, especially under light load conditions. These special operating conditions is that as you scroll through the surface (track and rolling) were effectively separated by a lubricant film and limit pollutants may cause surface damage. In fact, in ideal conditions, the so-called permanent bearing life is possible
Do not allow powerful punching, tapping bearing with a hammer directly is not allowed, passed through the rolling pressure is not allowed.
Rotating inner ring and the outer ring of the bearing Raceway surface, due to the rolling elements are rolling contact, thus running track for the dark side, running track at the Raceway surface, does not fall within the exception, which we will load conditions, so when removing oil-free bearings, please pay strict attention to and observe the movements of Raceway surface.