INTERNATIONAL ISO STANDARD First edition Rolling bearings — Damage and failures — Terms, characteristics and causes Roulements. Failure mode ISO Subsurface initiated fatigue. Is this normal Fatigue Failure, how many of you get to see a bearing actually fail. ribo lo gy, the Science fo r Maintenance. Fatigue on Inner Race. Ref.: ISO Rolling Bearings – Damages and Failures – Terms, Characteristics and Causes.
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Countermeasure Reconsider bearing selection downsize. Smearing can occur on the guiding flange faces and on the ends of the rollers due to insufficient lubrication see Figure 9. lso
For dated references, only the edition cited applies. Kso path pattern uniform in width, extending around the entire circumference of the raceway and axially displaced.
Countermeasure Store bearings in dry places with constant temperature and low humidity. Polar lines can also be caused by hard particles embedded in the cage pocket. Provide for ido preloading if suitable.
Finally, the wear becomes an accelerating process that results in a failed bearing. The order of the following illustrations follows the classification of failure modes shown in Figure 1.
BS ISO 15243:2017
Resultant temperature rise causes reduction of the hardness of the surfaces. False brinelling caused by vibrations occurring during rotation shows itself in closely spaced flutes see Figure This produces localized stress concentrations with the potential for cracking or flaking of the contact areas. Io happens even if the intensity of the current is comparatively low. Remember me on this computer.
Review means of locating bearing, e. Unless otherwise specified, no part of this publication may izo reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s member body in the country of the requester.
The microcracks, which are observed at the edge of the white etched areas butterflieswill normally propagate to the rolling contact surface producing flaking, spalling pitting and then peeling see Figure 3. Indentations in the raceways caused either by contaminant particles or by handling can also lead to surface initiated fatigue see 5.
Running path pattern varying in width and lso two diametrically opposed sections, displaced uso in relation to each other.
ISO – Rolling bearings — Damage and failures — Terms, characteristics and causes
Eliminate misalignment or select a bearing type suitable to accommodate the misalignment. Check out our FAQs.
Figure 31 — Fatigue fracture of an outer ring caused by insufficient support in the housing 5. Select bearing with suitable clearance. In the case of alternating axial loads use a bearing without the filling slot or, at least, apply only light axial loads in the direction of the filling slot.
Life cycle A standard is reviewed every 5 years 00 Preliminary. Countermeasure Select suitable fit and use tighter clamping. Flutes will develop from the craters in time, as shown in Figure Select appropriate radial internal clearance.
The various forms are illustrated with photographs and the most frequent causes are indicated. The features of particular interest for explaining changes and failures are described.
It is the complex combination of design, manufacture, assembly, operation and maintenance that often causes difficulty in establishing the primary cause of failure.
Inappropriate handling can also cause overloading and deformation of other bearing components, e.
The flutes are equally spaced. Running path pattern varying in width, extending around the entire circumference of the raceway and eccentric to the raceway.
The surfaces become dull 152243 a degree, which varies according to the coarseness and nature of the abrasive particles see Figure 7.
In the contact areas between rings and rolling elements, the flow lines of the current are condensed, resulting in localized heating within very short time intervals, so that the contact areas melt and weld together.
ISO FALLA EN RODAMIENTOS | Edicson Leonardo Briceño –
Because of the minute difference in the diameters of the two components, they will have a minute difference in their circumferences and, consequently, when brought into contact at one point by the radial load, will rotate at minutely different speeds. In the case of cylindrical roller bearings, rotate shaft slowly during mounting, if possible.
The bearing surface becomes shiny or a discoloured blackish red see Figure Countermeasure Check load and mounting conditions.