What are the causes of bearing damage?

1. Improper installation of bearings (about 16%)

1, improper use when installing the bearing, hitting the bearing directly with a hammer and transferring force with rollers are the main reasons for the damage.

2. The installation adjustment is not in place, the installation is biased or not installed in the bearing position, resulting in too large or too small bearing clearance. The inner and outer rings are not in the same rotation center, resulting in misalignment.

3. For sealed products, many customers like to remove the dense powder before installation, and then add some grease. This method is wrong, the sealed one can be used directly. Because the grease has been filled during production, it is not recommended to open the box to refuel. If necessary, it is recommended to clean all the original grease in the bearing before replacing it with new grease, so as to avoid premature damage of the bearing due to inconsistent grease models.

Suggestion: Select appropriate or professional bearing installation tools, and use special instruments to detect whether the radial runout and axial runout of the shaft meet the technological requirements after installation.

Second, the bearing is poorly lubricated (about 50%).

According to investigation, poor lubrication is one of the main reasons for premature damage of bearings. The main reasons include: not filling grease or lubricating oil in time; Grease or lubricating oil filling is not in place; Improper selection of grease or lubricating oil; Incorrect lubrication method and so on. In general, if the speed is lower than 3000 rpm, it is recommended to use grease lubrication. For example, grease lubrication is generally used for motors.

Suggestion: Choose the right grease or lubricating oil, use the right lubrication method and reasonable filling period.

Iii. Bearing pollution (about 14%)

Pollution can also lead to premature bearing damage. Pollution means dust, metal fragments, etc. Get into position. The main reasons include: opening the bearing package too early before installation, resulting in pollutants invading the bearing working face; The working environment is not clean during installation, resulting in pollutants invading the bearing working face; The working environment of bearings is unclean and the working medium is polluted.

Suggestion: it is best not to unpack the bearing package before use; Keep the installation environment clean during installation, and clean the bearings to be used; Sealing device for reinforcing bearing.

Four, bearing fatigue (about 34%)

Fatigue damage is a common damage form of bearings. The common causes of fatigue damage may be: long-term overload operation of bearings; Maintenance is not timely; Improper maintenance; Equipment aging, etc.

Suggestion: Select the rated load of the bearing reasonably to prolong the service life of the bearing.

Bearing is an important part of modern mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement and ensure its rotation accuracy.

According to the different friction properties of moving elements, bearings can be divided into rolling bearings and sliding bearings. Among them, rolling bearing has been standardized and serialized, but compared with sliding bearing, its radial size, vibration and noise are larger and its price is higher.

Rolling bearings are generally composed of outer ring, inner ring, rolling body and cage. According to the shape of rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

China is one of the countries that invented rolling bearings earlier in the world. In China's ancient books, the structure of axle bearings has been recorded for a long time. According to archaeological relics and materials, the earliest bearing with modern rolling bearing structure in China appeared in Xuejiaya Village, Yongji County, Shanxi Province from 2265438 BC to 207 BC. After the founding of New China, especially since 1970s, bearing industry has entered a brand-new high-quality and rapid development period under the strong impetus of reform and opening up.

Bearing is an important basic component of various mechanical equipment, and its accuracy, performance, life and reliability play a decisive role in the accuracy, performance, life and reliability of the main engine. In mechanical products, bearings are high-precision products, which not only need the comprehensive support of mathematics, physics and other disciplines, but also need the services of material science, heat treatment technology, precision machining and measurement technology, numerical control technology, effective numerical methods and powerful computer technology, so bearings are also products representing the national scientific and technological strength.

The lubrication purpose of rolling bearings is to reduce the internal friction and wear of bearings and prevent burning and sticking. Its lubrication effect is as follows.

Reduce the friction and wear of the contact parts of the rings, rollers and cages that make up the bearing, prevent metal contact and reduce friction and wear.

Prolongs the rolling fatigue life of the bearing,

During the rotation, the rolling contact surface is well lubricated and then stretched. On the contrary, if the viscosity of engine oil is low and the thickness of lubricating oil film is not good, it will be shortened. Heat generated by friction or heat from outside can be discharged through oil and cooled. Prevent bearing overheating and lubricating oil itself from aging.

other

It also has the function of preventing foreign matter from invading the bearing or preventing rust and corrosion.