Composite Preform Lay-up Profile Offset for Forming Defect Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the manufacturing of composite components, such as carbon fibre reinforced polymers for aerospace applications, the traditional lay-up process often results in preform bulk accumulation, leading to displacement issues during de-bulking, which can cause forming defects like wrinkling due to uneven displacement distributions.
Innovation Solution
The method involves offsetting the lay-up profile of the lay-up tool relative to the near net shape profile of the forming tool to accommodate preform bulk, allowing both surfaces of the preform to displace and conform to the respective forming surfaces, thereby reducing the largest displacement and minimizing forming defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the preform is laid up with preform bulk to accommodate the net shape volume, then the component volume requirement is met, but preform bulk accumulates along the stacking direction causing displacement during de-bulking and forming defects like wrinkling
Solution Approach 1:
The lay-up profile is preliminarily offset from the net shape profile before forming to pre-distribute the preform bulk along the stacking direction. This preliminary action ensures that during subsequent de-bulking and forming, the displacement is more uniform and prevents excessive localized displacement that causes wrinkling and forming defects.
Solution Approach 2:
The offset distribution is not uniform but tailored locally along the stacking direction based on the specific geometry and bulk requirements of different regions. This local quality approach allows optimal preform bulk distribution in each region, achieving both volume requirements and forming quality without excessive displacement.
2Volume of moving object
If the preform bulk is removed under pressure by applying vacuum bag or caul plate, then the net shape volume is achieved, but the plies towards the second surface are displaced farthest causing forming defects
Solution Approach 1:
The lay-up profile is preliminarily offset to distribute preform bulk before the de-bulking process. This preliminary distribution ensures that when vacuum bag or caul plate is applied, the displacement of plies is more uniform throughout the stack, preventing excessive displacement of plies near the second surface that would cause forming defects.
3Manufacturing precision
If the lay-up profile is offset relative to the near net shape profile, then preform bulk is distributed more evenly and displacement is reduced, but the lay-up tool design becomes more complex
Solution Approach 1:
The offset distribution is tailored locally along the stacking direction based on specific geometric requirements and bulk accumulation patterns of different regions. This localized offset approach achieves optimal displacement distribution and forming quality while avoiding unnecessary complexity in the lay-up tool design by applying offsets only where needed.
Data Source
AI summary
There is disclosed a method of manufacturing a composite component. A preform for the component is laid-up on a lay-up tool so that a first surface of the preform conforms to a lay-up profile of the tool. The preform is transferred to a forming tool comprising opposing first and second forming surfaces, each having a near net shape profile corresponding to a respective side of the component. The preform is formed in the forming tool to a near net shape of the component. The preform has a preform bulk in excess of the near net shape of the component prior to forming, and the lay-up profile is offset relative to the near net shape profile of the first forming surface to accommodate a proportion of the preform bulk. Accordingly, both the first surface and an opposing second surface of the preform displace during forming to conform to the respective near net shape profiles of the forming surfaces.