What Are The Failure Forms And Causes Of Miniature Bearings

Miniature bearings refer to the metric series, the outer diameter is less than 9mm;Inch series, all kinds of bearings with outer diameter less than 9.525mm.The main materials are carbon steel, bearing steel, stainless steel, plastic, ceramics, etc.

There are many reasons leading to the failure of miniature bearings, but the common ones are incorrect use, pollution, wear, rust, fatigue, improper use of lubricant, loading and unloading or handling damage and installation error, etc.

1. Fatigue peeling

The inner and outer raceway of rolling bearing and the surface of rolling body both bear load and relatively roll. Because of the action of alternating load, cracks first form at a certain depth below the surface, and then expand to the joint.Contact surface causes surface spalling pits to occur, and then develop to large spalling, this phenomenon is fatigue spalling.Fatigue spalling will aggravate the impact load, vibration and noise during operation.

2. Fear and tear

Due to the invasion of dust and foreign bodies, the raceway and the rolling body will cause surface wear when they move relative. Poor lubrication will also aggravate wear. The result of wear will increase the bearing clearance and the surface is rough.As the degree increases, the running accuracy of the bearing is reduced, so the motion accuracy of the machine is also reduced, and the vibration and noise are also increased.For precision mechanical bearings, it is often the wear that limits the life of bearings.

3. Plastic deformation

When the bearing is subjected to too large impact load or static load, or due to thermal deformation caused by additional load, or high hardness of foreign body invasion will form a dent or scratch on the surface of the raceway

Mark.This will make the bearing produce intense vibration and noise in the process of operation.And once there is an indentation, the impact load caused by the indentation will further cause the nearby surface peeling.

4.Corrosion

Miniature degree bearings may lose accuracy due to surface corrosion and cannot continue to work.Water, acid or alkaline substances of shooting will directly lead bearing corrosion.When bearing inside is energized, the current possible through rolling and surface will lead rust.In addition, when there is current passing through the bearing inside, the current may pass through the raceway and Rolling contact points on the body, thin oil film the edm and produce electric erosion, uneven washboard form is formed on the surface.

This is the information about several causes of failure of miniature bearings. It is not difficult to diagnose the cause of failure because the cause of failure of miniature bearings can be determined according to the marks left on the miniature bearings.BMB bearings reminds you that in order to maintain the good performance of the bearing as long as possible, it is necessary to maintain, test and overhaul regularly in order to prevent accidents from happening and ensure the reliability of the bearing operation.