Thin-Wall Vehicle Interior Panel Structure for Warpage Control
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Solution Overview
Problem
Thin-walled vehicle interior panels, particularly those with substrates between 0.5 and 2.25 mm, are susceptible to undesirable warpage during manufacture due to the foaming process, making them unsuitable for installation and performance in vehicles.
Innovation Solution
Incorporating a serpentine rib and extension flange at the edge region of the substrate, which provides structural support and rigidity during manufacturing, minimizing post-form warpage by matching the contour of the windshield and being removable after foaming, thereby reducing the thickness-related warpage issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the substrate thickness is reduced to decrease weight, then weight reduction is achieved, but warpage susceptibility increases during manufacturing
Solution Approach 1:
The substrate is segmented into multiple regions with different thicknesses: a thinner weight-reduced region and a thicker edge region that provides structural support during manufacturing. This segmentation allows the substrate to achieve weight reduction while maintaining manufacturing precision through the thicker edge portion that resists warpage.
Solution Approach 2:
Different regions of the substrate are given different local qualities in terms of thickness. The edge region has increased thickness to provide local structural reinforcement during the foaming process, while the central region maintains reduced thickness for weight savings. This local quality differentiation resolves the contradiction between weight reduction and warpage control.
2Weight of moving object
If the substrate thickness is reduced, then weight is decreased, but structural rigidity deteriorates during the foaming process
Solution Approach 1:
The substrate structure is divided into a thin central region for weight reduction and a thickened edge region for structural reinforcement. The thicker edge portion provides the necessary rigidity during the foaming process to prevent deformation, while the thin central region achieves the weight reduction goal.
Solution Approach 2:
The substrate exhibits local quality variations in thickness to simultaneously achieve weight reduction and maintain structural rigidity. The edge region has higher thickness providing local structural support during manufacturing, while the central region has lower thickness for weight savings.
3Manufacturing precision
If a serpentine rib and extension flange are added to reduce warpage, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The serpentine rib and extension flange are merged into a single integrated structural feature on the substrate. This combining of elements reduces the number of separate components and assembly steps, thereby limiting the increase in device complexity while still achieving the goal of improved manufacturing precision and reduced warpage.
Solution Approach 2:
The extension flange with serpentine rib serves multiple functions: it provides structural reinforcement to reduce warpage, acts as a bonding surface for the foam layer, and integrates multiple support functions into a single element. This multi-functionality reduces the need for separate components, limiting the increase in 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 solution effectively reduces post-form warpage to less than 15 mm, ensuring the panel's suitability for installation and performance by enhancing the structural integrity and manufacturability of thin-walled substrates.
Implementation Method 1
Incorporating a serpentine rib and extension flange at the edge region of the substrate, which provides structural support and rigidity during manufacturing, minimizing post-form warpage
Implementation Method 2
foaming a foam layer between the decorative layer and the substrate to form the intermediate layer
Data Source
AI summary
A vehicle interior panel such as an instrument panel includes a substrate having a thickness between 0.5 mm and 2.25 mm, inclusive, a decorative layer, and an intermediate layer located between the substrate and the decorative layer. A post-form warpage of the substrate is less than 15 mm at an edge region of the substrate. A serpentine rib located near the edge region helps impart structural rigidity to the panel during a foaming process to achieve an adequate degree of post-form warpage.