Inflatable Contact Element for Composite Ply Compaction
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Solution Overview
Problem
The manual lay-up of pre-preg plies or dry fabric in composite manufacturing is a time-consuming and laborious process, prone to inconsistencies and errors, especially when forming complex contoured composite structures, which can result in buckling or wrinkling due to uncontrolled compression.
Innovation Solution
An automated system with a flange forming device and a movable chassis that uses an inflatable contact element to apply pressure uniformly across a forming tool with contoured surfaces, enabling semi-automated ply-by-ply formation and compaction, reducing manual labor and inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual lay-up of pre-preg plies is used, then flexibility in handling complex geometries is improved, but productivity deteriorates due to time-consuming labor
Solution Approach 1:
The automated ply placement system uses self-contained robotic mechanisms that automatically retrieve, position, and compact plies without continuous manual intervention. The system serves itself by integrating all necessary functions (ply handling, positioning, compaction) into an automated sequence, thereby maintaining geometric adaptability while dramatically improving productivity
Solution Approach 2:
Manual mechanical operations are replaced with automated robotic systems that use programmed motion control to achieve precise ply placement on complex geometries. The robotic arm with integrated compaction mechanism substitutes human labor, maintaining the ability to handle complex shapes while eliminating the time-consuming nature of manual operations
2Productivity
If automated ply placement system is used, then productivity is improved, but device complexity worsens due to sophisticated equipment requirements
Solution Approach 1:
The robotic system is designed as a multi-functional platform that performs multiple operations (ply retrieval, positioning, compaction) through a single integrated mechanism. This universal approach improves productivity without proportionally increasing device complexity, as one system handles multiple tasks that would otherwise require separate equipment
Solution Approach 2:
The system merges the ply placement function with the compaction function into a single automated operation. The robotic arm places plies and immediately applies compaction force, combining two previously separate operations into one integrated process, thereby improving productivity while managing device complexity
3Ease of operation
If drape forming with vacuum bagging is used, then ease of operation is improved, but manufacturing precision deteriorates due to uncontrolled compression causing buckling or wrinkling
Solution Approach 1:
The vacuum bagging mechanical system is replaced with an automated robotic placement system that uses controlled mechanical compaction. This substitution maintains ease of operation through automation while improving manufacturing precision by eliminating uncontrolled compression and associated defects like buckling and wrinkling
Solution Approach 2:
The automated compaction system incorporates controlled pressure application with feedback mechanisms that monitor and adjust compaction forces in real-time. This feedback control ensures uniform pressure distribution across the ply, preventing the buckling and wrinkling defects that occur with uncontrolled compression in traditional vacuum bagging
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 reduces ply wrinkling and manufacturing errors, improving production efficiency by allowing precise pressure application and conformability to complex geometries, thus enhancing the quality and consistency of composite structures.
Implementation Method 1
an inflatable contact element pressurized to define a deformable contact surface configured to apply pressure to the ply material on the forming tool
Implementation Method 2
the deformable contact surface transitions from the web surface to the at least one flange surface
Data Source
AI summary
A method for use in ply compaction in forming a composite structure. The method includes positioning a ply of material on a forming tool having a web surface and at least one flange surface extending from the web surface, positioning a flange forming device at the ply of material on the forming tool, the flange forming device including an inflatable contact element pressurized to define a deformable contact surface, applying, by the deformable contact surface, the ply of material onto the forming tool with a predetermined pressure, wherein the deformable contact surface is moved across the forming tool, and wherein the inflatable contact element is configured to maintain the predetermined pressure as the deformable contact surface transitions from the web surface to the at least one flange surface.