Rivet Clamping Pressure Control for Gap-Free Multi-Layer Fastening
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Solution Overview
Problem
Existing clamping devices fail to maintain consistent clamping force, leading to gaps between members and rivets, which reduces the strength of the assembled parts by not allowing the rivet to transmit load across its entire surface.
Innovation Solution
A clamping method and device that applies a first high pressure to form a through hole without gaps and then a lower pressure to fix the rivet, using support portions to prevent bending and maintain contact between members and the rivet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a constant clamping force is applied during through hole formation and rivet fastening, then the clamping device structure is simple, but gaps form between members and rivets reducing fastening quality
Solution Approach 1:
The clamping device applies different clamping forces at different stages of the fastening process. During through hole formation, a first clamping force is applied to prevent member separation. During rivet fastening, a second clamping force (different from the first) is applied to prevent gap formation between members and rivets. This dynamic adjustment of clamping force resolves the contradiction by adapting the clamping pressure to the specific requirements of each process stage.
Solution Approach 2:
The patent changes the clamping force parameter between different process stages. The control unit adjusts the clamping force from a first value during through hole formation to a second value during rivet fastening. This parameter change enables precise control over gap formation, improving fastening quality without requiring overly complex mechanical structures.
2Manufacturing precision
If high clamping force is applied to prevent member bending, then manufacturing precision improves, but the risk of member deformation increases
Solution Approach 1:
The clamping force is dynamically adjusted based on the process stage and member response. During through hole formation, higher clamping force prevents member separation. During rivet fastening, the clamping force is modified to prevent gap formation while monitoring for signs of member deformation. This dynamic control resolves the contradiction by optimizing clamping pressure at each stage.
Solution Approach 2:
The control unit monitors the fastening process and adjusts clamping force based on detected conditions. If member deformation is detected during rivet fastening, the control unit can modify the clamping force to prevent further deformation while maintaining gap-free fastening. This feedback mechanism resolves the contradiction by continuously optimizing the balance between positioning accuracy and structural integrity.
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 ensures that the rivet is fixed without gaps, enhancing the fastening quality by allowing the rivet to transmit load across its entire surface, thereby improving the strength of the assembled parts.
Implementation Method 1
applying a predetermined first pressure to a plurality of members, which are superposed on each other, with a first support portion disposed on one surface side of the plurality of members and a second support portion disposed on the other surface side of the plurality of members to sandwich the plurality of members
Implementation Method 2
forming a through hole in the plurality of members with a cutting tool
Implementation Method 3
fixing a fastening part inserted through the through hole to the plurality of members with a fastening device
Data Source
AI summary
A clamping method includes a step (S3) for applying, by a first support portion disposed on one surface side of a plurality of superposed members and a second support portion disposed on the other surface side of the plurality of members, a predetermined first pressure to the plurality of members, and sandwiching the plurality of members; a step (S4) for forming a through hole with respect to the plurality of members by a cutting tool with the first pressure; a step (S5) for applying a predetermined second pressure to the plurality of members after the through hole is formed, and sandwiching the plurality of members by the first and second support portions, the second pressure being lower than the first pressure; and a step (S6) for fixing a fastening part inserted into the through hole to the plurality of members by a riveting device with the second pressure applied.