Composite Preforming Device with Inflatable Bladder Pressure
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Solution Overview
Problem
Existing methods for preforming multiple plies of composite fabrics or materials face challenges in maintaining accurate fiber orientation and registration, leading to distortion and inefficiencies due to operator variation and manual labor costs.
Innovation Solution
A device comprising a rack, pinion, belt, and inflatable bladders that applies uniform pressure to the material, ensuring consistent orientation and consolidation by engaging the mandrel with the belt and applying enhanced pressure to eliminate distortion and wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual laying-up of each ply is performed by operator, then fiber orientation and registration can be attempted to be maintained, but operator variation and manual labor limitations cause distortion and reduce productivity
Solution Approach 1:
The system uses self-aligning features including indexed registration holes that automatically align plies with the mandrel, eliminating the need for manual positioning. The plies self-index into correct positions through the registration hole mechanism, providing consistent orientation without operator intervention.
Solution Approach 2:
The patent replaces manual mechanical laying-up operations with an automated vacuum bagging system. The vacuum system automatically applies and maintains consolidation pressure, replacing the manual finger pressure and positioning operations with a automated mechanical-vacuum system that provides consistent results.
2Manufacturing precision
If manual laying-up is performed to eliminate distortion, then some orientation control is achieved, but quality is limited by operator capabilities and finger pressure
Solution Approach 1:
The vacuum system automatically performs the consolidation function that would otherwise require manual operator attention. The system self-regulates pressure application through the vacuum mechanism, eliminating variation between operators and providing consistent consolidation quality.
Solution Approach 2:
The vacuum bag acts as an intermediary between the operator and the material consolidation process. Instead of direct manual manipulation, the vacuum pressure is transmitted uniformly through the flexible bag to consolidate the plies, providing consistent pressure distribution regardless of operator skill level.
3Productivity
If uniform consolidation and orientation of complete ply pack is provided, then preforming is accomplished in much less time, but requires automated device with rack, pinion, belt, and pressure mechanisms
Solution Approach 1:
The vacuum bag serves multiple functions simultaneously: it provides consolidation pressure, maintains material orientation through its flexible conforming nature, and enables automated operation. This multi-functional element reduces the need for separate complex mechanisms for each function.
Solution Approach 2:
The flexible vacuum bag conforms to the mandrel shape and uniformly distributes consolidation pressure across the entire ply pack. This flexible film approach provides uniform consolidation without requiring complex rigid pressure application mechanisms, simplifying the overall device structure.
4Manufacturing precision
If rack and pinion drives mandrel into belt with material, then material is forced against mandrel eliminating distortion, but requires precise positioning mechanism
Solution Approach 1:
The indexed registration holes on the plies self-align with corresponding features on the mandrel during the driving process. This self-aligning mechanism eliminates the need for complex precision positioning systems, as the material automatically finds its correct position through the registration feature interaction.
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 enables faster and more repeatable preforming processes with reduced distortion and improved material indexing, resulting in consistently high-quality composite parts.
Implementation Method 1
each inflatable bladder is capable of compressing against a side of the mandrel
Implementation Method 2
Due to the elasticity of the belt, the belt generally conforms to the shape of the mandrel
Data Source
AI summary
A preforming device and method of use thereof, the device including a rack, a pinion, belt, belt tensioning feature, and mechanism for supporting a variably appliable enhanced pressure, such as may be applied using a bladder or bladders having one or more valves, the device capable of engaging a mandrel to form at least one ply and a binder against the exterior of the mandrel.