Blind Rivet Sleeve Axial Recess for Clamping Compensation
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Solution Overview
Problem
Blind rivets with folding portions often cause high hole face bearing pressures and expansion of plastic workpieces, leading to potential damage, especially when small edge spacings are required, making it difficult to connect softer or mechanically less loadable materials like plastics while achieving a large clamping region.
Innovation Solution
The blind rivet sleeve features an axial recess in the sleeve head to accommodate the sleeve fold, minimizing radial expansion and allowing the sleeve fold to move into the recess during setting, reducing mechanical loading on workpieces and enabling the use of smaller edge spacings without damaging the workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a folding portion is provided in the blind rivet sleeve to achieve clamping thickness compensation, then the blind rivet can be used for different clamping thicknesses, but the sleeve fold can lead to high hole face bearing pressures and expansion of plastic workpieces
Solution Approach 1:
The sleeve head is segmented into different functional zones: a bearing face zone for load distribution and a recess zone for fold accommodation. This segmentation allows the bearing face to maintain high contact pressure for clamping while the recess provides a compliance zone that absorbs the fold without transmitting excessive pressure to the workpiece hole face.
Solution Approach 2:
The axial recess is pre-formed in the sleeve head to anticipate and accommodate the sleeve fold before it occurs during setting. This beforehand cushioning space prevents the fold from creating high bearing pressures against the workpiece hole face, thereby cushioning the workpiece from potential damage while maintaining adaptability to different clamping thicknesses.
2Adaptability or versatility
If a folding portion is provided in the blind rivet sleeve to achieve clamping thickness compensation, then the blind rivet can be used for different clamping thicknesses, but the bore may expand or even burst in plastic workpieces
Solution Approach 1:
The sleeve head structure is segmented into a rigid bearing face portion and a compliant recess portion. This segmentation allows the bearing face to provide stable support while the recess accommodates the fold without transmitting excessive radial forces that could expand or burst the plastic workpiece bore.
Solution Approach 2:
The axial recess is pre-formed to anticipate the fold formation, providing a cushioning space that prevents excessive radial expansion forces from being transmitted to the plastic workpiece bore, thereby protecting against bore expansion or bursting while maintaining versatility for different clamping thicknesses.
3Length of moving object
If the sleeve fold is accommodated in the axial recess, then radial expansion is minimized and edge spacing can be reduced, but the axial recess increases the complexity of the sleeve head geometry
Solution Approach 1:
The axial recess introduces local geometric complexity only in the region where it is functionally required - to accommodate the fold. The rest of the sleeve head maintains simple geometry for bearing and clamping functions. This localized complexity minimizes the impact on manufacturing while achieving the benefit of reduced edge spacing through minimized radial expansion.
Data Source
AI summary
Blind rivet sleeve for a blind rivet, having a sleeve head which has a bearing face for bearing against a visible workpiece surface, and having a sleeve shank, wherein the blind rivet sleeve has a through-opening through which a mandrel can be guided, wherein the sleeve shank has a head forming portion which, during the setting of the blind rivet, is designed to form a blind head, and has a folding portion which is arranged between the head forming portion and the sleeve head and which, during the setting of the blind rivet, is designed to form a sleeve fold for the purpose of achieving a clamping thickness compensation.In this arrangement, the sleeve head has in the region of the bearing face an axial recess for receiving at least part of the sleeve fold formed during the setting.