The lifespan of bearings is closely related to manufacturing, assembly, and usage. Each step must be done properly to ensure the bearings operate optimally and extend their service life.

1 .Shaft and Bearing Housing Tolerance Selection and Control

After pressing the rolling bearing into the shaft, it should rotate smoothly without any obstruction. If there is noticeable difficulty in rotation, it indicates that the shaft size is too large, and the tolerance needs to be reduced. If there is a noticeable "sandy" feeling when rotating the bearing by hand after pressing, it may be due to excessive shaft tolerance or poor roundness. Therefore, while controlling the tolerance of the shaft and bearing housing, roundness must also be controlled.

2 .Bearing Assembly Methods

Since bearings are high-precision products, improper assembly can easily damage the bearing raceway, leading to bearing failure. Special tools should be used during the assembly of rolling bearings, and random hammering should be avoided. When pressing into the shaft, only the small ring should bear the force, and when pressing the outer ring, only the large ring should bear the force. Assembly should be done using pneumatic or hydraulic pressure, and the upper and lower molds must be kept horizontal during pressing. Any tilt can cause damage to the bearing raceway due to uneven force, resulting in abnormal noise in the rolling bearing.

3 .Prevention of Foreign Objects During Assembly

When bearings are mounted on a rotor for dynamic balancing, iron chips generated during the balancing process can easily enter the bearing interior. Therefore, it is best to perform dynamic balancing before installing the bearing. Some manufacturers apply oil or grease to the bearing housing for lubrication during assembly, but it is often difficult for operators to control the amount. If too much oil or grease accumulates in the bearing housing, it can easily seep into the bearing interior along the shaft during rotation. It is best not to apply oil or grease to the bearing housing. If it must be applied, ensure that no residue remains in the housing.

4 .Prevention of Paint-Induced Rust

Paint-induced rust is commonly seen in sealed motors. The motor may sound fine during assembly, but after being stored for some time, the motor noise increases significantly. Upon disassembly, severe rust is found on the bearings. This issue is mainly caused by acidic substances volatilized from the insulating paint, which form corrosive compounds under certain temperature and humidity conditions, corroding the bearing raceway and leading to bearing failure. Currently, the solution is to use high-quality insulating paint and allow adequate ventilation after drying before assembly.

Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)