Blind Rivet Embossed Structure for Shorter Mandrel Grip
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Solution Overview
Problem
Existing blind rivets have insufficient gripping force due to long mandrel pull sections, leading to increased manufacturing costs and inability to secure objects in various directions during preassembling and installing steps.
Innovation Solution
A blind rivet design featuring a mandrel with a reverse tapered pull section and a magnetic washer with a circular arc angle, allowing for reduced mandrel length and enhanced gripping force, enabling secure attachment in multiple directions using magnetic attraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the length of the pull section of the mandrel is increased to improve gripping force, then the gripping force is improved, but the overall length of the mandrel becomes longer and manufacturing cost increases
Solution Approach 1:
The mandrel pull section is designed with a reverse tapered surface featuring annular grooves that concentrate gripping action at specific locations. The non-uniform cross-sectional area created by the tapered surface with grooves provides enhanced gripping force at critical points without requiring a uniformly long pull section, thus reducing overall mandrel length while maintaining effective gripping capability.
Solution Approach 2:
The reverse tapered surface of the pull section creates a curved, non-linear geometry that optimizes stress distribution and gripping effectiveness. The annular grooves on the tapered surface create localized curvature variations that enhance mechanical interlocking with the rivet body, providing superior gripping force in a compact configuration.
2Adaptability or versatility
If the mandrel and rivet body are designed without pre-fastening capability, then the design is simpler, but the blind rivet cannot be secured firmly on objects during preassembling or installing steps
Solution Approach 1:
The invention replaces traditional mechanical pre-fastening mechanisms (such as threads, clips, or interlocking features) with magnetic attraction. The magnetic washer and mandrel utilize magnetic fields to securely hold the rivet assembly on ferromagnetic substrates during preassembling and installing operations, enabling reliable positioning in various orientations without complex mechanical pre-fastening structures.
3Adaptability or versatility
If a magnetic washer with circular arc angle is introduced to enable multi-directional fastening, then the adaptability to various directions is improved, but the device complexity increases
Solution Approach 1:
The magnetic washer serves multiple functions simultaneously: it provides magnetic attraction for securing the assembly to ferromagnetic surfaces, the circular arc angle geometry enables adaptation to various mounting directions and orientations, and it integrates with the mandrel structure to provide a unified mounting solution. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in overall device complexity.
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 reduces mandrel length and production costs while ensuring secure fastening in various orientations, improving accessibility and efficiency during single-sided operations.
Implementation Method 1
the magnetic washer having a circular arc angle of the invention takes the advantage of its own strong magnetism made by production, along with the use of mandrels and rivet bodies with magnetic permeability, to be applied to objects to be mounted that are not horizontal to the gravity direction during the preassembling step and the installing step
Data Source
AI summary
A blind rive includes a mandrel, a rivet body, and a magnetic washer having a circular arc angle. The mandrel includes a mandrel head and a shank. The shank includes a grip section, a groove section, and a pull section having a reverse tapered surface. The mandrel head is connected to one side of the grip section of the shank. The end surface of the mandrel head that is connected to one side of the shank has a circular arc surface. The grip section is the portion of shank close to the mandrel head. The groove section is disposed on the shank and connected to the grip section. The pull section has a reverse tapered surface disposed on the shank and connected to the groove section. The rivet body includes a through hole matching the mandrel, a rivet head, and a protruding edge structure.