Stability testing of rivets during riveting


If the pillar rivet is bent and deformed due to instabi […]

If the pillar rivet is bent and deformed due to instability under the action of the riveting pressure, it will also cause the cage to clamp the ball and the bearing to rotate inflexibly. Because the rivet has the greatest bending flexibility in the thickness direction, it is only necessary to check the stability of the rivet in the thickness direction. The flexibility of ring-grooved rivets in the thickness direction with less cost is: where λ is the flexibility, μ is the height coefficient, i is the radius of inertia, and J is the moment of inertia of the rivet in the thickness direction.
The overall rigidity of the shallow pocket corrugated cage is poor, and it is easy to cause problems such as rivet deformation and misalignment of the two cage halves during riveting. Therefore, when designing the ring groove rivet, the rivet and cage parameters should be selected reasonably, and related verification calculations should be carried out. In order to avoid the phenomenon of bearing ball clamping and inflexible rotation.
When the rivet is riveted for the second time, it can be regarded as its lower end fixed, and the upper end can only translate and not rotate. Because the rivet is short, its flexibility is generally less than the flexibility of the yield limit of the corresponding material, so the rivet is a small flexibility rod, so the critical stress of the rivet instability is the formula for checking the stability of the rivet. Where: is the actual stability safety factor when the rivet is riveted, and is the specified stability safety factor, generally 1.8-3.0, the working stress of the rivet. If the calculation result of the ring groove rivet does not meet the above conditions, it indicates that the stability of the rivet is insufficient during riveting, and the rivet thickness S should be increased to improve its stability.