Rivet Stud Bolt With Segmented Rivet Portion

The rivet portion is divided into multiple segments by forming grooves that extend along the axial direction. These grooves create distinct segments that can independently deform and interlock with the base, increasing both connection strength and anti-rotation capability. The segmentation allows each portion to engage with the base material separately, creating a more robust mechanical connection.

The invention transitions from a simple radial deformation (single dimension) to a combination of radial and axial deformation (multiple dimensions). The grooves extend in the axial direction and cause the rivet portion to deform both radially outward and axially, creating a three-dimensional interlocking structure that significantly improves connection strength and prevents rotation.

By segmenting the rivet portion through grooves, the deformation process is distributed across multiple smaller segments rather than requiring simultaneous deformation of the entire rivet. This segmentation reduces the peak load required for plastic deformation while achieving the same overall connection strength.

The grooves enable a more dynamic deformation process where the rivet portions can progressively engage with the base during pressing. The structure allows for staged deformation where segments engage sequentially, reducing the instantaneous load requirement compared to deforming a solid cylindrical rivet all at once.

The invention replaces the simple annular edge deformation with segmented deformation through grooves. The grooves create multiple discrete deformation zones along the axial direction, allowing the setting tool to engage with specific segments. This segmentation provides better mechanical advantage during deformation while creating superior interlocking with the base.

The grooves introduce curved surfaces and rounded features into the deformation process. The curved geometry of the grooves facilitates more uniform stress distribution during pressing, enabling smoother deformation with reduced peak loads while achieving stronger mechanical interlock compared to sharp annular edges.