Vehicle Body Upper Structure Using Braze Joining for Aluminum Separation
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Solution Overview
Problem
Existing vehicle body structures with aluminum roof panels and steel components face challenges in easy separation and purification of high-purity aluminum due to mechanical fastening, mixing of impurities during shredding, and inefficiencies in sorting processes.
Innovation Solution
A vehicle body upper structure design featuring braze joining of roof panels with side outer panels, notch and fragile portions for easy tearing with a nibbler, and use of aluminum brazing for secure yet separable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical fastening with rivets is used to connect roof panel and side outer panel, then connection strength is improved, but ease of separation deteriorates
Solution Approach 1:
The connection structure is divided into two distinct zones: a braze joining portion for strong permanent connection, and a fragile portion with reduced thickness for easy separation. This segmentation allows different functional requirements to be met in different regions of the same component.
Solution Approach 2:
The roof panel is designed with non-uniform thickness: a thick braze joining portion (first thickness) for strong connection, and a thin fragile portion (second thickness smaller than first) for easy tearing. This local quality variation enables the panel to exhibit different mechanical properties at different locations.
2Manufacturing precision
If aluminum roof panel is removed before shredding, then high-purity aluminum recycling is improved, but productivity deteriorates
Solution Approach 1:
The fragile portion is pre-designed in the roof panel structure to enable easy tearing during the shredding process itself. This preliminary design allows aluminum panels to be automatically separated from steel components during normal shredding operations without requiring pre-removal steps.
Solution Approach 2:
The roof panel's own structure (with the fragile portion) enables its automatic separation during shredding. The panel self-separates based on its designed weak point, eliminating the need for external intervention or manual removal processes.
3Productivity
If sorting by specific gravity is used to separate aluminum, then separation is improved, but purity deteriorates due to mixing of light metals
Solution Approach 1:
The fragile portion is extracted as a distinct structural element from the main roof panel body. This extracted portion serves as a dedicated separation zone that enables clean detachment of the aluminum panel from steel components, preventing contamination of aluminum scrap with other materials.
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
Facilitates easy separation of aluminum roof panels from other components, ensuring high-purity aluminum recycling by minimizing mixing with impurities and reducing attachment steps.
Implementation Method 1
the roof panel and the paired left and right side outer panels are fixed to one another by braze joining
Data Source
AI summary
A vehicle body upper structure includes: roof side rails; side outer panels; and a roof panel made of a material different from a martial of the roof side rails. The roof panel and the paired left and right side outer panels are fixed to one another by braze joining. An end portion of the roof panel in a vehicle front-rear direction includes a first coupling portion in which one of the roof side rails, the roof panel, and one of the side outer panels are coupled to one another, a notch portion that is provided on the inner side in the vehicle width direction of the first coupling portion, and a fragile portion that extends from a tip end portion of the notch portion toward a braze joining portion of the side outer panel and the roof panel.