Precautions For Cleaning And Maintenance Of Disassembled Ntn Angular Contact Ball Bearing
Precautions For Cleaning And Maintenance Of Disassembled Ntn Angular Contact Ball Bearing
2022年2月21日
Maintenance Skills Of Matching Lubrication Of Ina Thrust Angular Contact Ball Bearing
Maintenance Skills Of Matching Lubrication Of Ina Thrust Angular Contact Ball Bearing
2022年2月21日

Main Forms Of Rolling Bearing Failure

Rolling Bearing Failure

1. Fatigue spalling

The inner and outer raceways of the rolling bearing and the surface of the rolling body bear both load and relative rolling. Due to the action of alternating load, cracks first form at a certain depth under the surface (shear stress),

and then extend to the contact Rolling Bearing Failure surface, resulting in spalling pits on the surface, and then develop into large spalling. This phenomenon is fatigue spalling. Fatigue spalling will aggravate the impact load, vibration and noise during operation.

2. Wear

Due to the invasion of dust and foreign matters, the relative Rolling Bearing Failure movement of raceway and rolling body will cause surface wear, and poor lubrication will also aggravate wear. As a result of wear, the bearing clearance will increase, the surface roughness will increase,

the bearing operation accuracy will be reduced, so the motion accuracy of the machine will be reduced, and the vibration and noise will also increase. For precision mechanical bearings, it is often the amount of wear that limits the life of the bearing.

3. Plastic deformation

When the shaft bears excessive impact load or static load, or Rolling Bearing Failure additional load caused by thermal deformation, or foreign matters with high hardness invade,

dents or scratches will be formed on the raceway surface. This will make the bearing produce violent vibration and noise during Rolling Bearing Failure operation. Moreover, once there is an indentation, the impact load caused by the indentation will further cause the spalling of the nearby surface.

Main Forms Of Rolling Bearing Failure

4. Corrosion

Corrosion is one of the serious problems of rolling bearings. High precision bearings may lose Rolling Bearing Failure accuracy due to surface corrosion and cannot continue to work. Direct invasion of water, acid and alkaline substances will cause bearing corrosion.

When the bearing stops working, the bearing temperature drops to the dew point, and the water in the air condenses into water droplets attached to the bearing surface, which will also cause corrosion. In addition, when there is current passing through the inside of the bearing,

the current may pass through the contact point between the raceway and the rolling body. The very thin oil film may cause electric spark and produce electric corrosion, Rolling Bearing Failure forming washboard like unevenness on the surface.

5. Fracture

Excessive load may cause fracture of bearing parts. Grinding, heat treatment and improper assembly will cause residual stress.

Excessive thermal stress during operation will also cause fracture of bearing parts. In addition, improper assembly method and process may also cause block falling at the Rolling Bearing Failure retaining edge of bearing ring and the chamfer of roller.

6. Gluing

When working under poor lubrication, high speed and heavy load, due to friction and heating, the bearing parts can reach a very high temperature in a very short time, resulting in surface burns and gluing. The so-called gluing refers to the phenomenon that the metal on the surface of one part adheres to the surface of another part.

7. The cage is damaged

Improper assembly or use may cause deformation of the cage, Rolling Bearing Failure increase the friction between it and the rolling elements,

or even make some rolling elements stuck and unable to roll, and may also cause friction between the cage and the inner and outer rings. This damage will further aggravate vibration, noise and heating, resulting in bearing damage.

Maintenance Skills Of Matching Lubrication Of Ina Thrust Angular Contact Ball Bearing

Failure Causes Of Self-Aligning Ball Bearings, Key Points Of Operation Inspection And Daily Maintenance Skills

The function of bearing matching is to make the stationary ring and rotating ring of the bearing Rolling Bearing Failure consolidate with the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the installation part respectively,

so as to realize the basic task of transmitting load and defining the position of the moving system relative to the stationary system in the rotating state.

On the shaft and in the bearing pedestal, the thrust angular contact ball bearing is required to fix its position in three directions: radial, axial and tangent directions. Radial and tangential positioning is realized through tight fit of INA Bearing Ring,

and tight fit is adopted for axial positioning only in a few cases; Generally, axial limit parts, such as end caps and retaining rings, are Rolling Bearing Failure used to limit the axial position within the clearance range.

The following four points should be paid attention to when selecting the fit:

(1) The circumferential surface of bearing ring shall have good support and uniform stress to reduce deformation and give full play to the bearing capacity of INA Bearing.

(2) The ferrule cannot slide along the tangent direction in its mating surface, otherwise the mating surface will be damaged.

(3) The free end bearing must be able to adapt to the length change of the shaft and bearing seat hole, that is, it must have the ability to adapt to the swimming of the axial position within a certain range.

(4) Attention must be paid to making the installation and disassembly of thrust angular Rolling Bearing Failure contact ball bearing simple, labor-saving, time-saving and expenditure saving.

Oil bath lubrication is a common lubrication method, which is suitable for the lubrication of low and medium speed bearings.

A part of ina bearing is immersed in the groove, and the lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil surface should be slightly lower than the center of the low rolling element.

Oil dripping lubrication is suitable for bearing components requiring quantitative supply of lubricating oil. The amount of oil dripping is generally one drop every 3-8 Rolling Bearing Failure seconds. Excessive amount of oil will increase the bearing temperature.

The filtered oil is transmitted to the bearing parts by the oil pump, and the lubricating oil after contacting the ball bearing through the thrust angle is filtered and cooled before use. Because the circulating oil can take away a certain amount of heat and cool the bearing, this method is suitable for bearing parts with high speed.

The dry compressed air is mixed with the lubricating oil through the sprayer to form an oil mist. In the jet INA bearing, the airflow can effectively cool the bearing and prevent impurities from invading. This method is suitable for the lubrication of high-speed and high-temperature bearing parts.

Use the oil pump to shoot the high-pressure oil into the bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the thrust angular contact ball bearing rotates at high speed, the rolling element and cage also form air flow around at a fairly high rotation speed.

It is difficult to send the lubricating oil to INA Bearing by general lubrication method. At this time, the lubricating oil must be sprayed into the bearing by high-pressure injection method, and the nozzle position should be placed between the inner ring and the center of cage.