Z-Section Composite Manufacturing Resin Migration Control
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Solution Overview
Problem
The production of Z-section composite components in autoclaves faces challenges due to resin migration caused by local pressure variations, leading to thickness variations exceeding specified tolerances, which existing methods attempt to address with complex and costly processes involving additional vacuum and heat stages.
Innovation Solution
A method for manufacturing Z-section components using a mould with a specific design and a preliminary compaction process involving a separator film and ventilation strip to minimize resin migration, allowing for uniform thickness without additional vacuum or heat stages, utilizing a conventional autoclave process with a simplified setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional vacuum and heat stages (hot forming and hot debulking) are used to reduce resin flow, then manufacturing precision is improved, but device complexity and process time increase
Solution Approach 1:
The invention applies a preliminary vacuum stage before the standard autoclave cycle to pre-compact the laid-up structure and minimize resin migration pathways. This preliminary action prepares the material in advance to resist resin flow during subsequent polymerization, achieving thickness uniformity without requiring complex hot forming or hot debulking stages.
Solution Approach 2:
The invention introduces local ventilation strips at specific locations on the mould surface where resin migration is most problematic. These ventilation strips create localized resin extraction paths, allowing resin to be removed from critical areas during vacuum application, thereby preventing thickness variations in the Z-section regions without requiring global process modifications.
2Manufacturing precision
If additional vacuum and heat stages are used to reduce resin flow, then manufacturing precision is improved, but production time increases
Solution Approach 1:
The preliminary vacuum stage is applied during material lay-up before autoclave processing, allowing resin migration to be minimized in advance. This eliminates the need for time-consuming hot forming and hot debulking stages that would otherwise be required after autoclave processing, thereby reducing total process time while maintaining thickness uniformity.
Solution Approach 2:
The invention skips the traditional multi-stage hot forming and hot debulking process by implementing resin migration control during the initial lay-up and vacuum application phases. This allows the process to move directly from lay-up to standard autoclave polymerization, rushing through the critical resin migration phase before it can cause thickness variations, thereby significantly reducing overall process time.
3Manufacturing precision
If resin migration is minimized during autoclave process, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The invention modifies the mould by adding ventilation strips only at specific locations where Z-section geometry creates resin migration problems. This localized modification approach maintains simplicity of the overall mould design while providing targeted resin migration control, avoiding the need for complex global process modifications or sophisticated mould designs.
Solution Approach 2:
The ventilation strips act as intermediary elements between the mould surface and the laid-up structure. These strips provide a controlled interface for resin extraction during vacuum application, mediating the resin flow in a simple and effective manner without requiring complex mould modifications or process equipment.
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 ensures uniform thickness and minimizes resin migration, achieving the desired Z-section configuration without the need for complex or time-consuming processes, thereby simplifying and cost-reducing the manufacturing process.
Implementation Method 1
a vacuum bag (50) is applied to the mould (12) which supports the laid-up structure (20)
Implementation Method 2
a cycle of polymerizing the resin of the laid-up structure (20) is applied in an autoclave
Data Source
AI summary
A method of manufacturing a Z-section component from composite material uses a mold having a convex mold portion and a concave mold portion. The method includes the preparation of a vacuum bag for a polymerization cycle, including the covering the fresh component with a layer of peel ply formed from a plurality of strips of peel ply and fixing the layer of peel ply perimetrically to the mold using an adhesive tape. A line of sealant is positioned perimetrically above the adhesive tape around the fresh component and a separator film is positioned above the layer of peel ply so as to cover the layer of peel ply and the perimetric line of sealant. A ventilation textile is placed perimetrically on the mold, the textile having an aperture which is positioned so as to leave uncovered an underlying part substantially coinciding with the fresh component. A vacuum bag is applied for the polymerization cycle.