Blind Rivet Washer Segmentation for Crimping Force
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Solution Overview
Problem
Existing blind rivets struggle to provide sufficient crimping force when fastening members with fastening holes of larger inner diameters, and they often require additional components or complex structures, making the process less efficient and more costly.
Innovation Solution
A blind rivet design featuring a rivet body, a mandrel, and a washer that allows for the attachment of the washer to rotate and slide, with the washer being harder than the rivet body, enabling strong crimping force without plastic deformation, thus accommodating larger fastening holes and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the outer diameter of the rivet head is increased to accommodate larger fastening holes, then the adaptability to members with larger holes is improved, but the crimping force is reduced because the rivet head cannot be sufficiently squeezed
Solution Approach 1:
The blind rivet is divided into separate components: a rivet body with a smaller-diameter head that can be adequately squeezed, and a separate washer with a larger outer diameter that provides the necessary bearing surface. This segmentation allows each component to fulfill its specific function without compromise - the rivet head generates crimping force while the washer accommodates larger fastening holes
Solution Approach 2:
The washer acts as an intermediary element between the rivet head and the member being fastened. It transfers the squeezing force from the rivet head to the member while providing a larger outer diameter than the rivet head, thus enabling the system to accommodate larger fastening holes without reducing crimping force
2Adaptability or versatility
If a flange is integrally formed with the rivet head to increase outer diameter, then the adaptability to larger fastening holes is improved, but the device complexity is reduced while crimping force is insufficient
Solution Approach 1:
Instead of integrating the flange with the rivet head as a single component, the invention separates them into distinct parts - the rivet body and the washer. This allows the rivet head to maintain its original smaller diameter for effective squeezing while the separate washer provides the larger outer diameter needed for larger fastening holes
3Adaptability or versatility
If additional components are added to enable larger fastening holes, then the adaptability is improved, but the device complexity and component count increase
Solution Approach 1:
The washer is designed to fit over the rivet body, merging two functional elements into a compact assembly. While this adds a component, it maintains simplicity by using a straightforward geometric relationship (washer outer diameter larger than rivet head outer diameter) and eliminating the need for more complex integrated structures
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 design enables effective fastening with sufficient crimping force even when the inner diameter of one member's fastening holes exceeds the outer diameter of the rivet head, while minimizing the number of components and simplifying the fastening process.
Implementation Method 1
When the stem of the mandrel is pulled out and the sleeve end of the rivet body is enlarged, the rivet head is squeezed from the outer circumferential surface by the nosepiece of the fastening tool
Implementation Method 2
the rivet head is squeezed from the outer circumferential surface by the nosepiece of the fastening tool, and the inner circumferential surface of the rivet head engages the stem of the mandrel and is secured
Data Source
AI summary
A blind rivet is adapted for fastening two members, each member having a plurality of fastening holes arranged in corresponding positions. The inner diameter of the holes in the second member are greater than the inner diameter of the holes in the first member to compensate for positioning errors that may occur during machining. The blind rivet includes a rivet body having a sleeve, a rivet head, and a through hole; a mandrel having an elongated stem and a head; and a washer. The washer is arranged around the outer circumferential surface of the sleeve in the rivet body and adjacent to the rivet head. The members to be fastened are fastened between the enlarged end of the sleeve and the washer.