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To judge whether it meets the standards we require. Let’s share with you what we should check. The inspection of INA Bearing should be carried out under the astigmatism lamp, and the appearance, cracks and other parts of the bearing should be carefully observed.
Such as abrasion, scratch, crush and collision, will cause poor bearing installation, eccentric load and stress concentration, and reduce the rotation accuracy and service life.
The latter two are defects that are easy to store moisture and dirt, which are easy to develop into rust. Corrosion is the pollution source leading to poor installation, early wear and fatigue. Serious corrosion will scrap the bearing.
Such as raw material cracks, forging cracks, heat treatment cracks and grinding cracks, will become the source of stress concentration and expand rapidly in the later operation of the bearing, resulting in bearing fracture, which has a great impact on the service life and workability of the bearing.
In fact, the bearing factory has conducted 100% magnetic or radiographic inspection on the components of bearings for important purposes.
the local combination of these two defects with the base metal is not firm, and decarburization or carbon deficiency often exist around them to varying degrees. The material is easy to collapse, dent or wear, which is very unfavorable to the service life and accuracy of the bearing.
mainly observe whether the rivet head is offset, skewed, loose, missing meat or “double eyelid”, whether the welding position is correct, whether the welding spot is too large or too small, and whether the rolling element is stuck due to poor welding or excessive welding.
The above items are the key inspection parts in the inspection of ina bearings. In addition to the above inspection parts, if the typing quality is poor, such as illegible and damaged, they shall be considered defective, and the serious ones can also not be accepted.
rigidity is the bearing unit deformation required to produce the size of the force. Rolling bearing elastic deformation is very small, in most machinery can not be considered, but in some machinery, such as machine tool spindle bearings or pinion bearings, bearing rigidity is an important factor, generally should be selected cylindrical and tapered roller bearings.
Ina Bearing stiffness can be further improved by applying preload. Because these two types of bearings under load, its rolling body and raceway for line contact, elastic deformation is small, good rigidity, to the bearing applied preload is the conventional practice in machine tool applications.
Various types of bearings can also be preloaded to achieve the purpose of increasing the rigidity of the support. Such as angular contact ball bearings and tapered roller bearings, in order to prevent shaft vibration, increase the rigidity of the support, often in the installation of pre-applied certain axial force, so that the mutual compression.
Of course, the amount of preload should not be too large, too large will make the bearing friction increases, temperature increases, affecting the service life of the bearing.
However, for the non-locating end of the use of angular contact ball bearings bearing configuration, bearing and housing clearance fit is necessary.
Usually the non-locating bearing is positioned at the drive end of the spindle, so the effect on the stiffness of the system at the working end is limited.
If high rigidity is also desired at the drive end, cylindrical roller bearings with tapered bores should be used This configuration allows for axial displacement of the spindle relative to the NTN bearing housing within the bearing and enables both the inner and outer rings to be interference fit.
