Flexible Tubular Roller for Composite Ply Compaction
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Solution Overview
Problem
Existing methods for compacting composite plies over contoured tools are either slow, labor-intensive, non-calibrated, and unreliable, or require expensive equipment and consumable materials, and struggle to apply uniform compaction pressure over extended areas.
Innovation Solution
A flexible, compliant tubular member is rolled over the composite plies, applying uniform compaction pressure by flexing along the tool's contours, eliminating the need for ply sweeping and ensuring consistent pressure through a series of rollers and compaction cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated composite tape laying machines with integral rollers are used, then compaction speed and automation are improved, but the equipment cost increases and uniform pressure distribution deteriorates
Solution Approach 1:
The patent uses a flexible bladder member that can be inflated to apply compaction pressure. This flexible membrane structure replaces complex rigid roller mechanisms, achieving both automated compaction and uniform pressure distribution while reducing equipment complexity and cost.
2Device complexity
If vacuum bags are used to compact plies, then equipment cost is reduced, but uniform compaction pressure over all areas deteriorates
Solution Approach 1:
The flexible bladder member is designed to conform to the contoured tool surface and can be inflated to provide uniform compaction pressure across the entire ply area. This flexible membrane structure eliminates the pressure distribution problems associated with vacuum bags while maintaining low equipment cost.
3Productivity
If automated ply sweeping machines with nosepieces are used, then compaction automation is improved, but fiber distortion and smearing occur due to sweeping motion
Solution Approach 1:
The flexible bladder member acts as an intermediary that applies compaction pressure through inflation rather than through direct mechanical contact and sweeping motion. This eliminates fiber distortion and smearing while maintaining automated compaction, as the pressure is applied uniformly without mechanical dragging of the fibers.
4Device complexity
If hand-layup and sweeping methods are used, then equipment cost is reduced, but labor intensity and processing time increase
Solution Approach 1:
The flexible bladder member is automatically inflated and deflated through a controlled system, eliminating the need for manual operation while keeping equipment simple. The system self-regulates the compaction process through pressure control, achieving both low cost and high productivity.
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 method allows for efficient, uniform compaction of composite plies over contoured surfaces without fiber damage, reducing production costs and processing time, while maintaining a long, uninterrupted line contact force.
Implementation Method 1
The flexible, compliant properties of the tube assure uniform, constant compaction pressure is applied to the ply over extended lengths. The flexible, compliant properties of the tube over its entire length allows the tube to conform to and apply even compaction pressure to the ply in area of localized tool contours.
Implementation Method 2
The rolling motion of the tube avoids fiber damage to the ply. Rolling the tubular member includes contacting the tubular member with a set of rollers, rotating the tubular member within the set of rollers.
Data Source
AI summary
A composite ply is compacted around a radius edge of the tool by a rolling former that rolls over the radiused edge and conforms to any contours along the length of the edge. The rolling former includes a compliant tubular member rotatably held in spaced apart roller assemblies.