Bidirectional Solid Punch Rivet for Stress-Reduced Joining
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Solution Overview
Problem
Existing joining technologies face challenges in connecting components of varying thicknesses without requiring specific orientation or causing material damage due to mechanical stress peaks.
Innovation Solution
A solid punch rivet with a fully cylindrical shank and mirror-symmetrical axial end regions featuring a flat, axially symmetrical depression surrounded by a closed annular bead, allowing bidirectional setting and reducing mechanical stress through material displacement during the connection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solid punch rivet with a fully cylindrical shank and cutting geometry is used, then setting in multiple components is facilitated, but the rivet must be fed in a specific orientation requiring appropriate technical equipment
Solution Approach 1:
The patent applies asymmetry by providing the cylindrical shank with axially opposite asymmetric end regions, where each end region has a different geometry (first end region with first geometry, second end region with second geometry). This asymmetric design enables the rivet to be fed in any orientation while still achieving proper setting, thereby eliminating the need for complex orientation-specific feeding equipment.
2Strength
If conventional joining elements are used, then components can be joined, but mechanical stress peaks cause material damage
Solution Approach 1:
The patent applies spheroidality by providing both end regions with annular beads that have a curved, dome-like geometry. These rounded bead structures distribute mechanical stress evenly during the setting process, avoiding stress concentration at sharp edges or corners, thereby preventing material damage while maintaining strong connections.
3Loss of substance
If a headless semi-tubular punch rivet is used, then no punch slug is created, but the components are held between closing head and formed setting head without radial expansion
Solution Approach 1:
The patent applies asymmetry by providing axially opposite asymmetric end regions with different geometries. One end region features a geometry suitable for forming a closing head without penetration, while the other end region has a geometry for forming a setting head with radial expansion. This asymmetric design enables the rivet to create different head types at opposite ends, combining the advantages of both headless and expanded head designs.
Data Source
Figure 1
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AI summary
The invention relates to a full punch rivet (1), by means of which at least two components (B1, B2) can be connected to one another by setting into the at least two components, and which comprises a fully cylindrical shank (10) having axial end regions (20, 30) configured in mirror symmetry relative to one another, each end region having a planar axially symmetrical recess (22, 32) which is surrounded by a closed circumferential annular bead (40, 50) which connects the recess to an outer peripheral surface (12) of the shank in a circular arc-shaped manner.