Removable-Core Rivet Structure for Sealed Interlocking
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Solution Overview
Problem
Existing rivets are not suitable for applications requiring high sealing, such as waterproofing, due to material flow between work pieces during the riveting process, which compromises the interlocking and sealing integrity.
Innovation Solution
A rivet design featuring a main body with a lateral wall and a core part that forms an accommodation space, where the core part's end surface presses against the work pieces to direct material flow outwardly, preventing penetration and enhancing interlocking without shearing, allowing for a simple die structure and separate manufacturing of the main body and core part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rivet uses a hollow structure with a large chamber for material flow, then the riveting process can accommodate material deformation, but the fluid between work pieces can flow through the gap between the rivet and work piece, compromising sealing performance
Solution Approach 1:
The rivet is divided into two separate components: a main body and a core part. This segmentation allows the core part to be removed after riveting, eliminating the gap that causes fluid leakage while maintaining the necessary chamber space for material deformation during the riveting process.
Solution Approach 2:
The core part is extracted and removed after the riveting process is complete. This extraction eliminates the internal chamber structure that would otherwise create a pathway for fluid to flow between work pieces, thereby improving sealing performance while the core part still served its function during riveting.
2Strength
If the lower edge of the foot portion is folded outwardly to form an interlock, then the interlocking function is enhanced, but the shear force fractures the work piece and the rivet penetrates through, compromising sealing
Solution Approach 1:
By separating the rivet into a main body and a removable core part, the interlocking structure is formed by the main body alone without requiring the lower edge to penetrate through the work piece. The core part is extracted after riveting, eliminating the source of shear force that causes work piece fracture.
Solution Approach 2:
The core part is removed after the interlocking structure is formed, eliminating the need for the rivet to penetrate through the work piece. This extraction prevents the shear force from fracturing the work piece while maintaining the interlocking function.
3Ease of manufacture
If the rivet uses a single-part hollow structure, then the manufacturing process is simple, but the fluid can flow through the gap between the rivet and work piece, failing to meet high sealing requirements
Solution Approach 1:
The rivet is segmented into a main body and a core part that can be manufactured separately and then assembled. This segmentation improves sealing integrity by allowing the core part to be removed after riveting, eliminating the gap for fluid flow, while the manufacturing process remains relatively simple through separate component production.
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 design ensures effective interlocking and sealing while reducing material waste, simplifying die centering requirements, and enabling a lightweight, cost-effective production process with improved tensile resistance and sealing performance.
Implementation Method 1
the core part has an end surface for pressing against at least an end surface of one of the work pieces when the rivet is being operated to rivet the work pieces, to allow materials of the work pieces flow outwardly of the core part
Implementation Method 2
An accommodation space is formed between the core part and the lateral wall of the main body. When the rivet is being operated to rivet the work pieces, the space accommodates the materials of the work pieces flowing into the space which deform outwardly at least a portion of the lateral wall of the main body
Data Source
AI summary
The present rivet invention has a main body comprising a first end and a second end opposite to the first end, wherein the main body further comprises a lateral wall disposed at the second end and circumferentially extending around the main body; and a core part disposed at the second end of the main body and contained inside the lateral wall of the main body, wherein the core part has an end surface for pressing against at least an end surface of one of the work pieces when the rivet is being operated to rivet the work pieces, to allow materials of the work pieces flow outwardly of the core part. An accommodation space is formed between the core part and the lateral wall to receive materials of the work pieces flowing into the space and deform outwardly at least a portion of the lateral wall of the main body.