Pillar type rivet under the action of pressure riveting, if because of bending deformation resulting from the instability, can also cause cage clamp ball, bearing rotation is not flexible, etc. Because the rivet in the thickness direction bending flexibility is big, so just to check the stability of the rivet in the thickness direction. Ring groove rivet in thickness direction less capability to bend the flexibility of type: lambda for flexibility, mu for height coefficient, I as the radius of inertia, J for the rivet in the thickness direction of moment of inertia.

Rivet riveting fit again, can be regarded as the bottom is fixed, the top can only translation not rotate. Because the rivet is shorter, its flexibility is generally less than the flexibility of corresponding material limit, so the rivet for small flexibility pole, buckling critical stress, so the rivet rivet is on compressive bar stability check formula.

Formula: for the stability safety factor of rivet riveting pressure, as the rules of safety factor, generally in 1.8 3.0, the working stress of the rivet. Ring groove rivet if results do not meet the above conditions, rivet riveting ensuring stability is insufficient, should by increasing the thickness of the rivet S to improve its stability.

In riveting timeliness are prone to deformation dislocation, two and a half to keep the rivet, so in the ring groove rivet design to choose the rivet and keep frame parameters, and the related calculation, lest appear clip ball bearings and the phenomenon such as rotation is not flexible.