Chamfering is a term used in mechanical engineering to remove burrs caused by machining on parts and to facilitate the assembly of parts. Chamfers can be seen everywhere in our lives, on the frame of mobile phones, on tempered doors, on vases, and so on.
Generally, the function of chamfering is to remove burrs and make them beautiful. However, for the chamfer specifically pointed out in the drawings, it is generally the requirement of the installation process, such as the installation guide of the bearing, and some arc chamfers (or called arc transitions) can also play a role in reducing stress concentration and strengthening the strength of shaft parts. It also makes assembly easy, usually before the end of the machining process.
On agricultural machinery parts, especially the end faces of round fittings and round holes are often processed into chamfers of about 45°. These chamfers have a variety of functions, in the maintenance operation must be carefully checked, and make full use of it, otherwise it will bring many difficulties to the maintenance of agricultural machinery, and even cause unexpected failures. For example, before the molding process of small parts such as bolts, chamfering is also carried out in order to facilitate the material to enter the molding mold.
What is the function of bearing chamfering?
1. The bearing steel must have chamfering during rough processing before heat treatment, so that it plays a very important role in the heat treatment of the material, the release of stress, the redistribution of the internal structure, the lack of cracks, and the reduction of deformation. Chamfering can solve the problem of stress concentration.
2. Chamfer and deburr, so that the product is not sharp and will not cut the user.
3. It plays the role of guiding and positioning during assembly.
Generally, the outer chamfer of the outer ring and the inner chamfer of the inner ring of the bearing are rounded, in addition to effectively avoiding contact stress, the most important thing is to facilitate installation. Rounded corners allow for a good transitional loading.
Especially in the bearing process, the positioning surface of the matched shaft and shaft hole, that is, the shaft shoulder and the bearing seat abutment part, the chamfer size of this part directly affects whether the bearing can be correctly installed in place.
From the above figure, we can see that the chamfer angle of the bearing is larger than that of the bearing box and the shaft shoulder, and the chamfer of the bearing must be larger than this arc to ensure that the bearing fits to the axial positioning surface.
As shown in the figure above, when the chamfer of the bearing is less than the chamfer angle of the bearing box and the shoulder chamfer, it cannot be assembled in place, which is easy to cause a series of problems such as stress concentration at the chamfer of the bearing, tilting of assembly, and failure to match other matching parts.
Therefore, the fit of the chamfer must be fully considered in the assembly process of the bearing.