Rivet Collar Anchoring in Deformed Dome Flat Materials
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Solution Overview
Problem
Existing methods for attaching functional elements to flat materials, such as riveting, often require expensive tools and do not significantly enhance the anchoring or tear-out strength of the elements within the workpiece or flat material.
Innovation Solution
A method where a dome-like section is formed in the flat material, and a functional element is anchored by riveting the rivet collar into the joint opening without deforming the dome-like section, allowing the deformed rivet collar to grip behind the material for enhanced anchoring, using a single tool for both shaping and riveting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the dome-like section is deformed back to reduce the diameter of the joining opening and press the edge against the rivet collar to generate radial compression ring stress, then additional anchorage is achieved, but a relatively expensive tool is required
Solution Approach 1:
The dome-like section is formed in advance before riveting the functional element. This preliminary formation creates a geometric shape that will work with the rivet collar deformation to achieve anchorage without requiring additional complex tools during the riveting process itself.
Solution Approach 2:
Instead of deforming the dome-like section back during riveting to create anchorage (which requires expensive tools), the invention inverts the approach: the dome-like section maintains its shape and the rivet collar is deformed to grip against it, achieving anchorage through the rivet collar deformation alone.
2Stress or pressure
If the dome-like section is deformed back during riveting to reduce the diameter of the joining opening, then radial compression ring stress is generated, but the anchoring or tear-out strength does not achieve significant improvement
Solution Approach 1:
The invention reverses the conventional approach: instead of deforming the dome-like section back to generate stress, the dome-like section maintains its shape and the rivet collar is deformed to grip against it. This inversion achieves both stress generation and significant tear-out strength improvement.
Solution Approach 2:
The invention changes the geometric parameters of the dome-like section (specifically the ratio between base diameter and joining opening diameter, and the height of the dome) to optimize the mechanical interaction with the rivet collar during deformation, thereby achieving superior anchorage without excessive stress concentration.
3Strength
If the rivet collar is deformed to grip behind the flat material for anchoring, then tear-out strength is improved, but the diameter of the joining opening is reduced
Solution Approach 1:
The invention optimizes the geometric parameters of the dome-like section, specifically ensuring that the base diameter is sufficiently large compared to the joining opening diameter. This parameter optimization allows the rivet collar to deform and grip effectively behind the material while maintaining an adequate joining opening diameter for functional element installation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves high tear-out strength for the functional element by forming a deformed rivet collar that optimally grips the flat material, improving anchoring without the need for expensive tools and without reducing the diameter of the joining opening.
Implementation Method 1
by joining and plastic deformation of this rivet collar, the dome-like section is not deformed in such a way that the diameter of the joining opening is reduced
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Method of attaching a functional element (2, 27, 102, 102a, 102b) to a plastically deformable flat material (1, 29, 101) or workpiece, wherein the functional element (2, 27, 102, 102a, 102b), at a bearing surface (6, 28, 105.1), has a riveting collar (7, 108) which projects beyond this surface and is formed by a hollow or tubular section, wherein a dome-like section (10, 10a, 10b, 10c, 104) is formed in a joining region in the flat material (1) by plastic deformation and projects with its base (11, 104.1) beyond the plane of the flat material (1) surrounding this section and has a joining opening (9, 103) at this base, and wherein the attaching of the functional element (2, 27, 102, 102a, 102b) to the flat material (1) is effected in a joining and riveting operation by inserting the riveting collar (7, 108) into the joining opening (9, 103) and by plastic deformation of this riveting collar (7, 108) in such a way that the base (11, 104.1) is accommodated in a region of the base surrounding the joining opening (9, 103) between the deformed riveting collar (7.1, 108.1) and the bearing surface or end face (6, 28, 105.1) of the functional element (2, 27, 102, 102a, 102b), wherein the functional element (2, 27, 102, 102a, 102b) is anchored to the marginal region surrounding the joining opening (9, 103) without reducing the diameter of the joining opening (9, 103). A connection and connecting elements are also claimed.