Interior Trim Mounting Bracket Structure to Minimize Warping
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Solution Overview
Problem
Conventional automobile interior trim attachment brackets face challenges in precision and defect reduction due to warping and deformation caused by surface shrinkage during the forming process, leading to gaps between the bracket and the trim when attached to a vehicle body panel.
Innovation Solution
The proposed solution involves an automobile interior trim attachment bracket with a structure that includes a joined portion, a clip arrangement portion, a contact portion, and a bridging portion, where the non-functional areas are opened as holes, reducing the resin surface area and increasing flexibility, thereby minimizing warping and surface shrinkage during formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the trim attachment bracket is formed with a widely curved shape to conform to the soft trim, then the bracket can attach to curved surfaces, but the bracket becomes easily deformed and warping occurs during forming
Solution Approach 1:
The bracket is divided into multiple functional portions (joined portion, clip arrangement portion, contact portion) connected by bridging portions. This segmentation allows each portion to independently adapt to the curved surface while maintaining overall structural integrity, reducing warping during forming.
Solution Approach 2:
Different portions of the bracket are designed with different local properties: the joined portion has high rigidity for precise attachment, while the bridging portions have lower rigidity to accommodate curvature, and the contact portion has specific hardness for panel contact. This local differentiation resolves the contradiction between conformity and precision.
2Strength
If the bracket is formed as a solid resin structure, then the bracket has high strength and rigidity, but surface shrinkage causes warping and gaps during forming
Solution Approach 1:
The bracket incorporates a through-hole penetrating from the front surface to the back surface, creating a porous structure. This reduces the overall resin volume, minimizing surface shrinkage during forming while maintaining structural strength through the strategic placement of functional portions around the hole.
Solution Approach 2:
The bracket structure is segmented into functional portions connected by thinner bridging portions. This segmentation allows the solid resin sections to maintain strength where needed while reducing overall material volume, thereby reducing surface shrinkage and warping during the forming process.
3Adaptability or versatility
If the bracket is made flexible to conform to the trim, then the bracket can attach to curved surfaces, but the bracket lacks the rigidity for precise fixing
Solution Approach 1:
The bracket exhibits different rigidity levels in different locations: the joined portion and contact portion have high rigidity for reliable fixing, while the bridging portions have lower rigidity for flexibility. This local quality differentiation enables both conformability and fixing reliability simultaneously.
Solution Approach 2:
The bracket is designed with dynamic rigidity characteristics - rigid where needed for fixing and flexible where needed for conformity. The bridging portions act as flexible connectors that allow the rigid functional portions to maintain their shapes for precise attachment while adapting to the overall curved geometry.
Data Source
AI summary
The trim attachment bracket includes, as bracket function portions, at least a joined portion joined to the automobile interior trim, a clip arrangement portion where a clip fitted into an attachment hole in a vehicle body panel is arranged, and a contact portion contacting against the vehicle body panel. The trim attachment bracket includes a bridging portion connecting the bracket function portions to each other. A portion other than the bracket function portions and the bridging portion is opened as a hole having a predetermined shape while the bracket function portions and the bridging portion are maintained.