Maintenance method for installation and loading of deep groove ball bearings

When the deep groove ball bearing rotates, the raceway surfaces of the inner ring and the outer ring of the deep groove ball bearing are in rolling contact with the rolling elements, so the running track is a dark surface, and the running track attached to the raceway surface is not abnormal. From this, the load conditions can be known, so when disassembling the deep groove ball bearing, please pay close attention and observe the running track of the raceway surface. If you look closely at the running trajectory, you will know that only radial loads, large axial loads, moment loads, or extreme rigidity unevenness are present on the bearing housing. It can be checked whether an unexpected load is added to the bearing and whether the installation error is a national university, etc., and become a clue to investigate the cause of bearing damage.

Correct installation of deep groove ball bearings is the guarantee of their extended service life. Many people do not have the professional knowledge in this area, and they are not particularly in place during installation, which may easily lead to improper bearing installation and mechanical operation accidents. As a professional mechanical maintenance engineer It is important to know something about bearing installation. Generally speaking, the bearing installation is determined according to the structure, size and installation part of the deep groove ball bearing, and its cloud-like nature. When installing, pay attention to applying pressure directly on the surface of the ferrule. The pressure must be applied vertically, and the pressure cannot be applied by rotating the rolling elements. The more common methods of bearing installation are as follows:

The matching method between the bearing ring and the shaft is mostly transition fit, and the matching method between the bearing seat ring and the bearing seat hole is mostly clearance fit. Generally speaking, such a matching method is relatively easy to install, and the central shaft of the bearing should be fixed on the shaft. , so as to avoid the rotation of the circumference relative to the circumference, resulting in unnecessary wear. In terms of the installation method of the bearing here, there are more ways to rotate the installation, which can make the inner ring fit more tightly.

When the outer ring of the bearing fits loosely with the bearing seat, and the inner ring fits tightly with the shaft, the professional press used for installing the deep groove ball bearing can be used to press the bearing on the shaft first, and then follow the shaft and the bearing. Install them into the bearing seat together. When applying pressure to install, pay attention to the surface of the inner ring of the bearing, and then pad a sleeve made of soft metal. The material is copper or mild steel. When the diameter is larger than the journal diameter and the outer diameter is smaller than the rib of the inner ring, it is necessary to avoid putting pressure on the cage.

The inspection results can be judged by those who use inertia bearings or those who are proficient in bearings.

Judgment criteria vary depending on mechanical properties and importance, inspection cycles, and the like. If the following damage occurs, the deep groove ball bearing cannot be reused and must be replaced.

1) Fractures and defects of bearing components.

2) Peeling of the rolling surface of the raceway surface.

Bearing fault identification method

It is very important to improve productivity and economy to identify or predict the failure of bearings in operation without disassembly inspection.

The main identification methods are as follows:

1) Recognition by voice

Recognition by sound requires extensive experience. Sufficient training is required to be able to recognize bearing sounds versus non-deep groove ball bearing sounds. For this reason, the work should be carried out by special personnel as much as possible. The sound of the bearing can be clearly heard by attaching a listening device or a listening stick to the housing.

2) Identification by operating temperature

This method is a comparative identification method, which is only used in the occasions where the running state does not change much. For this, continuous recording of the temperature is necessary. When a fault occurs, not only the temperature rises, but also irregular changes.

3) Identification by the state of the lubricant

Sampling and analysis of the lubricant, judge whether the degree of contamination is mixed with foreign matter or metal powder. This method is especially effective for deep groove ball bearings or large bearings that cannot be viewed closely.