Chamfering is a term in mechanical engineering. In order to remove burrs on parts caused by machining and to facilitate the assembly of parts, chamfering is generally made on the ends of parts. Chamfering can be seen everywhere in our lives, on mobile phone frames, tempered doors, vases, etc. Today let’s talk about the functions of bearing chamfering.
Generally, the function of chamfering is to remove burrs and make them beautiful. However, the chamfers specifically pointed out in the drawings are generally requirements for the installation process, such as the installation guide for bearings. Some arc chamfers (or arc transitions) can also reduce stress concentration and enhance the strength of shaft parts. In addition, it can also make assembly easier, usually before the end of processing.
The function of bearing chamfering:
1, bearing steel must be chamfered during rough machining before heat treatment. This plays a very important role in releasing stress during heat treatment of the material, redistributing the internal organizational structure, making cracks less likely to occur, and reducing deformation. Chamfering can solve the problem of stress concentration.
2, chamfering and deburring make the product not sharp and will not cut the user.
3, plays the role of guide and positioning during assembly.
Usually the outer chamfer of the outer ring of the bearing and the inner chamfer of the inner ring are both rounded corners. In addition to effectively avoiding contact stress, the most important thing is to facilitate installation. Rounded corners ensure a good transitional fit.
Especially in the process of bearing installation, the matching positioning surface of the shaft and the shaft hole, that is, the shaft shoulder and the bearing block shoulder part, the chamfer size of this part directly affects whether the bearing can be installed correctly.
From the picture above, we can see that the chamfer of the bearing installed between the axle box and the shaft is larger than the chamfer of the bearing box and the shaft shoulder. The chamfer of the bearing must be larger than this arc to ensure that the bearing fits the axial positioning surface.
As shown in the figure above, when the chamfer of the bearing is smaller than the chamfer of the bearing box and the shaft shoulder, it cannot be assembled in place, which can easily cause stress concentration at the chamfer of the bearing, tilt of the assembly, and the inability to match other mating parts.
Therefore, the chamfer fit must be fully considered during the assembly process of the bearing.
(Source: Mold Information)