Automotive Panel Hem Stabilizing Assembly
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Solution Overview
Problem
During the hemming process of automotive panel assemblies, the lack of stabilization between panels before adhesive curing leads to potential misalignment and improper bonding, as the adhesive acts as a lubricant, allowing relative movement between panels.
Innovation Solution
The implementation of textured geometries on the panels, such as ridges and grooves, that interlock without material deformation, combined with non-compressible spacer features like glass spheres within the adhesive, to maintain panel alignment and prevent adhesive displacement until curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond panels during hemming, then bonding strength is improved, but panel misalignment occurs due to adhesive acting as lubricant
Solution Approach 1:
The textured geometry features (ridges and grooves) act as an intermediary mechanical stabilization system between the panels and adhesive. These features provide a friction-based locking mechanism that prevents panel movement during adhesive curing, while the adhesive itself remains the primary bonding agent for ultimate strength.
Solution Approach 2:
The textured geometry is pre-formed on the panel surfaces before adhesive application. This preliminary mechanical interlocking structure is prepared in advance to prevent misalignment during the subsequent adhesive bonding process, ensuring panels remain stabilized until curing completes.
2Strength
If adhesive is applied between panels, then bonding is achieved, but adhesive displacement occurs allowing panel movement
Solution Approach 1:
The textured geometry serves as a mediator that mechanically restrains adhesive displacement. The ridges and grooves create a physical barrier and friction interface that holds adhesive in place, preventing it from acting as a lubricant that would allow panels to shift during the bonding process.
3Ease of manufacture
If smooth panel surfaces are used, then manufacturing is easier, but relative movement between panels occurs during hemming
Solution Approach 1:
Rather than making the entire panel surface textured (which would complicate manufacturing), the textured geometry is applied locally only to the hemming interface areas. This localized texturing provides the necessary friction and mechanical interlocking for stability while leaving the rest of the panel surfaces smooth and easy to manufacture.
Solution Approach 2:
The hemming interface combines two surface properties: textured geometry for mechanical interlocking and stability, and smooth surfaces for ease of manufacture. This composite approach integrates different surface qualities in specific locations to achieve both manufacturing efficiency and structural stability.
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 solution effectively stabilizes the panels during the hemming process, ensuring proper alignment and secure bonding by reducing relative movement and maintaining adhesive in place until it cures, thereby preventing misalignment and enhancing the integrity of the hem joint.
Implementation Method 1
The flange of the first panel includes a textured geometry that interlocks with a textured geometry of the edge region
Implementation Method 2
an adhesive that secures the flange of the first panel to the edge region of the second panel
Implementation Method 3
a plurality of spacer features disposed within the adhesive and configured to keep areas of the flange spaced from areas of the edge region to accommodate adhesive
Data Source
AI summary
An automotive panel assembly according to an exemplary aspect of the present disclosure includes a first panel, a second panel, and a flange of the first panel folded over an edge region of the second panel to hem together the first and second panels. The flange of the first panel includes a textured geometry that interlocks with a textured geometry of the edge region.