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Turning inspection of FAG bearings ring

wallpapers Tech 2020-08-27
For different types of FAG bearings ring blanks, although their diameter series and external dimensions are different, the inspection items and inspection methods after turning are basically the same. The general inspection items and methods of FAG bearings ring turning processing are as follows:
1. Ferrule single width dimension Cs (Bs) and variable VCs (VBs)
Test by comparing with block gauges or standard parts. As shown in Figure 1, during measurement, the reference end face of the tested ferrule is supported on three supporting blocks (or directly supported on the measuring platform), the measuring point should deviate from the chamfer, and the measuring point is located directly on one point . Different radial angular positions measure the individual width of the ferrule, and the deviations are ∆Cs (∆Bs). Measure the difference between the maximum and minimum distance between the two end faces by rotating the tested ferrule by more than one circle (ie VC (VB)) on the instrument. When testing, pay attention to avoid burrs and dirt.
2. End surface flatness
You can use a knife-edge straightedge (or steel straightedge) to check the distribution of the optical gap or use an instrument to measure it. During the test, at the same angular position of the ferrule, measure the end face size from the inside to the outside along the end face of the measuring table. The difference in end face size is the difference between the inside and outside of the end face.
3. The size and change of a single outer diameter and a single inner diameter
Including outer ring outer diameter Ds, inner ring inner diameter d2s, inner ring inner diameter ds and outer ring outer diameter D2s. When measuring, please use the method of comparing with standard parts for comparative measurement. At the same time, the measuring point should deviate from the chamfer. The distance from the measuring point to the end face is usually equal to or greater than twice the nominal size of the chamfer. When measuring, the diameter measured by rotating more than one circle of the ferrule on the instrument on any radial plane of the outer (inner) cylindrical surface is Ds, d2s, ds, D2s. In actual measurement, the measured value is the deviation of the diameter, namely ∆Ds, ∆d2s or ∆ds, ∆D2s. The difference between the largest and smallest diameter measured in one revolution is the diameter change VDsp, Vd2sp (Vdsp,
4. The average diameter change VDmp (Vdmp)
In the same axial plane, use the reference section to determine the difference between the diameters of the two ends. When measuring, the measuring point should deviate from the chamfer, and the distance from the measuring point to the section is usually equal to or greater than twice the nominal size of the chamfer.
5. Roundness error ΔCir
The roundness error is also called edge degree in FAG bearing manufacturers. It refers to the difference between the radius of the circumscribed circle and the radius of the inscribed circle on the cross section of the equal-diameter polygon on the surface of the rotating body.
In ferrule turning processing, when a three-jaw chuck or a clamping device with the same principle as the three-jaw chuck is used, the product is prone to elastic deformation. At this time, although the machined surface is circular in the clamped state, the original shape is restored after the clamping force is removed, that is, a circular error appears on the cut surface.
You can use D913, D914, H903, H904 and other instruments and tripods to detect circular errors. When measuring, rotate the ferrule more than one turn, and measure the maximum and minimum values ​​on the same radial plane. The difference in size is IsΔCir.
However, after using a tripod for measurement, the value of the measurement result has been changed, and the changes are different for tripods with different angles.
6. Straightness of the outer diameter of the busbar (d> 20mm)
When rotating the item, usually use a knife-edge straightedge or steel ruler to check the optical gap.
7. The radius and coordinate size of arc chamfering and the angle and coordinate size of non-arc chamfering
Use the radius gauge, coordinate ruler and angle template to check the radius, coordinate size and angle of the chamfer.
8. The quality of all processed surfaces
Surface quality includes surface roughness and surface defects (cutting damage, black burrs, bumps, soft wear, cracks, etc.), as well as other required shapes, such as oil grooves on the outer diameter. The surface quality must be checked in each process, usually by visual inspection or comparison with standard samples.

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