Honeycomb Panel Insert Assembly With Piston-Guided Adhesive Bonding

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Solution Overview

Problem

Existing insert systems for panels with cellular solid core structures, such as honeycomb panels, face challenges in ensuring precise positioning and alignment during adhesive curing, as they require auxiliary tools and can lead to adhesive flow into non-strength contributing regions, affecting mechanical load-carrying capability.

Innovation Solution

An insert system with a base and outer skirt forming a chamber to receive adhesive, featuring a piston that discharges adhesive into the core structure, ensuring large-area bonding interfaces and mechanical augmentation, along with guiding means and anchoring features for improved positioning and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If auxiliary tools are used to hold inserts during adhesive curing, then positioning precision is improved, but device complexity increases

Engineering Contradiction:
Improvepositioning precisionVSAvoiddevice complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The insert system performs its own positioning function through self-aligning features such as guide pins fitting into guide holes, flanged bases resting on panel surfaces, and interference-fit transitions. The adhesive itself serves as the positioning medium rather than requiring separate auxiliary tools, as the insert is designed to be held in position by the adhesive during curing without additional fixtures or support devices.

Inventive Principle:
Principle #25Self-service

2Strength

If adhesive is applied generously to ensure bonding, then bonding strength is improved, but adhesive flows into non-strength contributing regions reducing manufacturing precision

Engineering Contradiction:
Improvebonding strengthVSAvoidadhesive placement precision
Core Design Contradiction:
StrengthVSManufacturing precision

Solution Approach 1:

The insert design incorporates localized adhesive application features including recesses and cavities that confine adhesive to specific high-strength zones at the insert-panel interface. The flanged base geometry and guide pin arrangements create localized bonding regions where adhesive is concentrated where most needed for structural strength, preventing wasteful flow into non-critical areas while maintaining superior bonding performance.

Inventive Principle:
Principle #3Local quality

3Reliability

If expandable bonding agent is used to fill all ruptured cells, then bonding coverage is improved, but insert weight increases

Engineering Contradiction:
Improvebonding coverageVSAvoidinsert weight
Core Design Contradiction:
ReliabilityVSWeight of moving object

Solution Approach 1:

The insert system utilizes the existing porous cellular structure of the honeycomb panel core as the bonding medium rather than requiring heavy expandable bonding agents. The adhesive is applied to bond the insert to the panel skin and to the cell walls within the opened aperture, leveraging the panel's own cellular architecture to provide bonding coverage and structural integration without adding excessive weight from filler materials.

Inventive Principle:
Principle #31Porous materials

4Strength

If heat is applied to melt thermoplastic bonding material, then bonding is achieved, but energy consumption increases and panel structural integrity may be affected

Engineering Contradiction:
Improvebonding strengthVSAvoidenergy consumption
Core Design Contradiction:
StrengthVSUse of energy by moving object

Solution Approach 1:

The system replaces thermal bonding processes with mechanical bonding mechanisms. Instead of using heat to melt thermoplastic materials, the insert employs mechanical features such as guide pins, flanged bases, and interference-fit transitions that physically anchor the insert to the panel. The adhesive cures through chemical reaction rather than thermal melting, eliminating the need for external heating devices and associated energy consumption while preserving panel structural integrity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP3464911B1Insert system, insert and panel assembly
Publication Date: 2021.07.14 RUAG SCHWEIZ AG
  • EP3464911B1 patent drawingFigure 1~2
  • EP3464911B1 patent drawingFigure 3~4
  • EP3464911B1 patent drawingFigure 5~6

AI summary

The invention is directed to an insert system (1) comprising an insert (100) with a base (110) and an outer skirt (120) extending from the base (110), thereby forming a chamber. The outer skirt (120) is provided with a first inner skirt surface and a first outer skirt surface (124). The insert system further comprises a panel (200) with a core structure (250) and a first cover sheet (230) that at least partially covers the core structure (250). The first cover sheet (250) defines a first outer panel surface (211) and has an opening (212). At least one piston (300) is arranged in the opening (212) and beneath the first outer panel surface (211). According to the invention the piston (300) during mounting of the insert (100) sweeps into the chamber to discharge an adhesive agent (400) from the chamber into the core structure (250) via at least one pathway.