312:, and the timing of the rotation speed causes the balls or rollers to contact the races only when they are in similar positions. This forms wear marks caused by contact with the bearings and the races in specific areas, but not in others, leaving an uneven wear-pattern that can become quite deep before failure occurs, resembling brinelling. However, the marks are usually too wide, due to the motion of the bearing, and do not exactly match the shape of the rolling elements, and therefore this type of wear can be differentiated from true brinelling.
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far enough) to redistribute the displaced lubricant. The result is a finely polished surface that resembles a brinell mark, but has not permanently deformed either contacting surface. This type of false brinelling usually occurs in bearings during transportation, between the time of manufacture and installation. The polished surfaces are often mistaken for brinelling, although no actual damage to the bearing exists. The false brinelling will disappear after a short break-in period of operation.
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Stationary false-brinelling occurs without any rotational motion in the bearing. This occurs when contacting bodies vibrate against each other in the presence of very small loads, which pushes lubricant out of the contact surface area, all while the bearing assembly cannot move far enough (or rotate
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Precession between a rotating shaft in a hole, caused by excess clearance due to wear. If a bearing with four balls were located at the blue circumference of the shaft, each ball positioned at the corners of the square, contact of those balls with the red, outer bearing-race only occurs in discrete
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bearings into holes or onto shafts. Care must usually be taken to ensure that pressure is applied to the proper bearing race to avoid transferring the pressure from one race to the other through the balls or rollers. If pressing force is applied to the wrong race, brinelling can occur to either or
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needles instead. This decreases the chances of brinelling, but increases friction and other factors. However, although roller and ball bearings work well for radial and thrust loading, they are often prone to brinelling when very high impact loading, lateral loading, or vibration are experienced.
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that exceeds the material limit. It usually occurs in situations where a significant load force is distributed over a relatively small surface area. Brinelling typically results from a heavy or repeated impact load, either while stopped or during rotation, though it can also be caused by just one
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of materials in their calculations to avoid this mode of failure. A rolling element bearing's static load rating is defined to avoid this failure type. Increasing the number of elements can provide better distribution of the load, so bearings intended for a large load may have many balls, or use
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Fretting wear can also occur during operation, causing deep indentations. This occurs when small vibrations form in the rotating shaft and become harmonically in sync with the speed of rotation, causing circular oscillations in the shaft. The oscillation causes the shaft to move in
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or press has serrated jaws or roughened surfaces. Flat pressing plates are often used in the pressing of bearings, while soft copper, brass, or aluminum jaw covers are often used in vises to help avoid brinell marks from being forced into the workpiece.
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Brinelling is undesirable, as the parts often mate with other parts in very close proximity. The very small indentations can quickly lead to improper operation, such as chattering or excess vibration, which in turn can accelerate other forms of
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Brinelling can be caused by a heavy load resting on a stationary bearing for an extended length of time. The result is a permanent dent or "brinell mark". The brinell marks will often appear in evenly spaced patterns along the bearing
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areas along that race, causing vibration, noise, and accelerated wear, and leaving indentations that resemble brinelling, but can be differentiated from true brinelling.
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when the ball bearings within the swivel head produce grooves in the hard cap, thus degrading performance by increasing the required swivel force.
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A common cause of brinelling is the use of improper installation procedures. Brinelling often occurs when
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are often used instead of roller bearings in applications where such loads exist, such as in automotive
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both of the races. The act of pressing or clamping can also leave brinell marks, especially if the
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when a hardened washer is not used. For example, brinelling occurs in
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application of a force greater than the material limit.
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Automotive
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193:Brinelling is a material surface failure caused by
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46:. Unsourced material may be challenged and removed.
333:Harris, Tedric A.; Kotzalas, Michael N. (2007).
210:or roller bearings or rounded indentations in
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292:A similar-looking kind of damage is called
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162:of a hard surface. It is named after the
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335:Advanced Concepts of Bearing Technology
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55:"Brinelling"
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38:Please help
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