Flat-Bottom Rivet Structure for Flush Plate Joints
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Solution Overview
Problem
Existing riveting methods, such as pre-drilled hole riveting, compromise sealing and corrosion resistance, and cause material cracking in materials with low ductility, while non-pre-drilled hole riveting results in a protruding joint bottom that affects aerodynamic performance and requires high deformation, leading to equipment wear and tear.
Innovation Solution
A rivet with an improved structure featuring a rivet cover, shoulder, and body with a torque transmission structure, positioning structure, and penetration holes to prevent material trapping and deformation, allowing for flat-bottom riveting that reduces wind resistance and facilitates subsequent covering processes, while enabling either detachable or non-detachable joints through controlled friction heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non pre-drilled hole riveting is used, then the sealing and corrosion resistance are improved, but the joint bottom protrudes from the surface causing increased wind resistance and reduced aerodynamic performance
Solution Approach 1:
The invention changes the geometric parameters of the rivet, specifically designing a rivet body with a specific length-to-diameter ratio and a rounded end surface that matches the curvature of the lower plate. This parameter optimization allows the rivet to deform the plates without creating a protruding joint bottom, while still achieving the necessary interference fit for sealing and corrosion resistance.
Solution Approach 2:
The invention employs a dynamic riveting process where the rivet is inserted and then subjected to controlled impact loading. The rivet body dynamically deforms the plates during the riveting process, creating an interference fit that pulls the joint bottom flush with the plate surface while maintaining the sealing and corrosion resistance benefits of non-pre-drilled hole riveting.
2Reliability
If non pre-drilled hole riveting is used, then the sealing and corrosion resistance are improved, but large plastic deformation is required which may crack materials with low ductility
Solution Approach 1:
The invention optimizes the rivet geometric parameters including the length-to-diameter ratio, end surface curvature radius, and body shape to distribute the deformation more uniformly. These parameter changes reduce stress concentration and prevent material cracking in low-ductility materials while still achieving the interference fit necessary for sealing and corrosion resistance.
Solution Approach 2:
The invention designs the rivet with a rounded end surface that acts as a cushion during the riveting process. This rounded geometry distributes the impact force more evenly across the plate material before deformation begins, preventing stress concentration that would cause cracking in materials with low ductility, while still enabling the subsequent interference fit for reliable sealing.
3Strength
If large impact force is applied to deform rivets for interfering interlock effect, then the joint strength is improved, but the structural strength and stiffness requirements for riveting equipment increase significantly
Solution Approach 1:
The invention changes the rivet geometric parameters to optimize the deformation characteristics. The specific length-to-diameter ratio and body shape allow the rivet to achieve the necessary interference fit and joint strength with reduced impact forces, thereby lowering the structural strength and stiffness requirements for the riveting equipment while maintaining joint strength.
4Strength
If large impact force is applied during riveting, then the interfering interlock effect is improved, but serious wear and tear occurs on punches and dies
Solution Approach 1:
The invention optimizes the rivet geometric parameters including length, diameter, and body shape to achieve the interfering interlock effect with reduced impact forces. This parameter optimization maintains the necessary mechanical interlocking between rivet and plates while significantly reducing the wear and tear on punches and dies during the riveting process.
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
The solution achieves a flush joint surface, improved strength and stiffness, enhanced corrosion resistance, reduced equipment wear, and increased flexibility by preventing material deformation and penetration, thus expanding the application range and improving joint performance.
Implementation Method 1
the to-be-connected material trapped in the inner cavity of the rivet body is discharged to the outside of the rivet body during the riveting process
Implementation Method 2
enabling either detachable or non-detachable joints through controlled friction heat
Data Source
AI summary
A rivet with improved structure for forming flat-bottom riveting of plates, which comprises a rivet cover, a rivet shoulder and a rivet body; specifically, the rivet cover is provided with a torque transmission structure and a positioning structure for driving the rivet to rotate; the rivet body comprises an inner cavity of the rivet body, an outer wall of the rivet body and an end of the rivet body; with the present invention, the bottom surface of the joint can be flush with the surface of the connected plates, which facilitates the subsequent processing of the coverage on the bottom surface, reduces the wind resistance coefficient of the joint, and broadens the application range of the process.