Integrally Molded Attachment Members for Aircraft Liner Panels
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Solution Overview
Problem
Conventional aircraft panels lack optimized structural reinforcement and attachment points, relying on sacrificial layers or external bonding methods, which are not effective for providing high-strength anchorages for interior lining systems.
Innovation Solution
The method involves forming a thermoplastic panel with thermoset portions and attachment members, where the thermoset material is heated to flow into openings in the panel, hardening to secure the attachment members, using a thermoplastic resin and chopped fibers, and a matched metal die mold to integrate anchor points and features like slide-in strips directly into the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional uniform panels are used, then manufacturing is simple, but structural reinforcement and attachment capabilities are insufficient
Solution Approach 1:
The panel incorporates localized reinforcement features (integrally molded attachment members, stiffeners, and recesses) at specific positions rather than uniform reinforcement throughout. This allows structural enhancement where needed while maintaining simplicity in other areas, resolving the contradiction between strength improvement and structural complexity.
Solution Approach 2:
The attachment members are integrally molded with the panel during the same manufacturing process, merging what would traditionally be separate components (panel and attachment hardware) into a single integrated structure. This eliminates the need for separate bonding operations and reduces overall structural complexity while enhancing attachment strength.
2Strength
If external bonding or sacrificial layers are used for reinforcement, then manufacturing process is simple, but attachment strength and structural integrity are insufficient
Solution Approach 1:
The attachment members are formed as an integral part of the panel during the molding process itself, combining the panel fabrication and attachment member installation into a single operation. This eliminates subsequent bonding steps and achieves high attachment strength without complicating the manufacturing process.
Solution Approach 2:
The attachment members are pre-formed and positioned within the mold cavity before the panel material is molded around them. This preliminary positioning ensures proper alignment and integration, achieving strong attachments without requiring complex post-processing or bonding operations.
3Adaptability or versatility
If uniform cross-sectional strength is maintained, then manufacturing is straightforward, but optimized part installations and anchor points cannot be provided
Solution Approach 1:
The panel design incorporates locally optimized attachment members with varying geometries, materials, and positions tailored to specific installation requirements. Different attachment members can have different thread types, flange configurations, or embedding depths, providing adaptability for various fastening needs while maintaining overall panel manufacturing simplicity.
Solution Approach 2:
The integrally molded attachment members serve multiple functions: they provide structural reinforcement, create attachment points for various fasteners, and can incorporate features for sealing or alignment. This multi-functionality achieves design versatility without proportionally increasing manufacturing 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
This approach provides high-strength, integrally molded anchor points and features within the panel, enhancing structural integrity and attachment capabilities for aircraft interior lining systems, reducing the need for external bonding and sacrificial layers.
Implementation Method 1
heating the thermoset portion to flow at least a portion of the thermoset portion into openings defined in the thermoplastic panel
Implementation Method 2
cooling the panel assembly so that the thermoset portion hardens
Implementation Method 3
heating the thermoset portion to flow
Implementation Method 4
cooling the thermoplastic panel while heating the thermoset portion
Data Source
Figure 1~2
AI summary
A method of making a panel assembly (10) that includes forming a thermoplastic panel (12), placing a thermoset portion (16) into a pocket in a mold, placing an attachment member (14) into the pocket in the mold, positioning the thermoplastic panel in the mold, cooling the thermoplastic panel while heating the thermoset portion to flow at least a portion of the thermoset portion into openings defined in the thermoplastic panel, and cooling the panel assembly so that the thermoset portion hardens, thereby securing the attachment member to the thermoplastic panel.