Multi-chamber Conformable Bladder for Composite Tooling
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Solution Overview
Problem
Conventional tooling systems struggle to produce complex thermoplastic composite parts with sufficient consolidation pressure and are limited by thermal expansion, making it difficult to achieve aerospace-level quality.
Innovation Solution
A multichamber conformable bladder system with independently inflatable inner bladders and a flexible bladder cover, allowing for adjustable pressure distribution and application within a tool chamber to form parts, enabling precise control over pressure and reducing thermal expansion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional clamshell molds are used for thermoplastic composite molding, then rapid processing is achieved, but complex mold line shapes cannot be produced and sufficient consolidation pressure is not provided
Solution Approach 1:
The mold is divided into multiple independently controllable bladder chambers that can be inflated to different pressures. This segmentation allows different regions of the mold to apply different consolidation pressures, enabling complex mold line shapes to be produced while maintaining rapid processing capabilities.
Solution Approach 2:
The mold transitions from a static conventional clamshell design to a dynamic multi-chamber bladder system where pressure distribution can be adjusted during the molding process. This dynamic control enables adaptation to complex geometries and provides sufficient consolidation pressure where needed.
2Productivity
If conventional tooling systems are used for thermoplastic composite molding, then simple shapes are produced quickly, but aerospace level quality cannot be achieved due to insufficient consolidation pressure and thermal expansion effects
Solution Approach 1:
The tooling system is segmented into multiple independently controlled bladder chambers, allowing precise pressure control in different regions. This enables aerospace-level quality by providing sufficient consolidation pressure for complex thermoplastic composite shapes while maintaining rapid processing through parallel operation of multiple chambers.
Solution Approach 2:
The system enables dynamic adjustment of pressure parameters in different mold regions during the molding process. By changing pressure parameters independently in each bladder chamber, the system achieves both rapid processing and aerospace-quality consolidation for complex thermoplastic composite parts.
3Device complexity
If a single-chamber bladder system is used, then simple pressure application is achieved, but variable pressure distribution cannot be provided for complex parts
Solution Approach 1:
The bladder system is segmented into multiple independently inflatable chambers, each capable of receiving different pressure levels. This segmentation provides variable pressure distribution for complex parts while keeping each individual chamber relatively simple in structure.
Solution Approach 2:
The multi-chamber bladder system serves multiple functions: it provides uniform pressure when needed, variable pressure distribution for complex geometries, and can be configured for different part shapes and sizes. This multi-functionality increases adaptability without proportionally increasing overall system 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 system enables the production of complex thermoplastic composite parts with improved consolidation pressure and reduced thermal expansion effects, achieving aerospace-level quality by allowing for variable pressure application across different regions and times, minimizing defects and wrinkles.
Implementation Method 1
Each inner bladder comprises an inner bladder chamber that is independently inflatable to selectively apply pressure to the part within the tool chamber
Implementation Method 2
a bladder cover disposed over the plurality of inner bladders within the tool chamber to provide a barrier between the plurality of inner bladders and the part
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A tool (100) for forming a part (112) includes a first tool portion (102) including a first tool surface (106). The tool further includes a second tool portion (104) comprising a second tool surface (108) facing the first tool surface, wherein the first tool surface and the second tool surface define a tool chamber (110) for forming the part. The tool further includes a bladder subassembly (114) disposed in the tool chamber between the first tool surface and the second tool surface. The bladder subassembly includes a plurality of inner bladders (116) disposed within tool chamber, wherein each inner bladder of the plurality of inner bladders includes an inner bladder chamber (118) that is independently inflatable to selectively apply pressure to the part. The bladder subassembly further includes a bladder cover (120) disposed over the plurality of inner bladders within the tool chamber to provide a barrier between the plurality of inner bladders and the part.