FIELD: construction.
SUBSTANCE: matrix for connecting has the cavity with the base. The matrix wall on the cavity side is made with faces. Wherein each face is coupled with the adjacent face by the radius. In accordance with the implementation version, the faces are placed between the cavity base and the supporting matrix surface. At least one of the faces is inclined outwardly from the central axis in the direction from the cavity base towards the supporting matrix surface.
EFFECT: reducing the probability of cracks occurrence in the material of the rivet during its formation.
13 cl, 11 dwg
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