Preform Adjustment for Compression Molding Consistency
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Solution Overview
Problem
During the compression molding process of fiber-reinforced plastic (FRP) devices, issues such as fiber, resin, and gas movement lead to variations in structural characteristics of the manufactured device, making it difficult to achieve consistent and anticipated properties.
Innovation Solution
A computer-implemented method for forming fiber-reinforced composite devices involves creating preform models, adjusting the layup of fibers using tow layup adjustment vectors, and applying molding force vectors to control the deformation of the preforms within a mold, thereby minimizing movement and ensuring consistent structural properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If compression molding is applied to fiber-reinforced plastic devices, then strength characteristics are improved, but fiber, resin, and gas movement cause structural variation
Solution Approach 1:
The patent applies preliminary action by creating a preform model before compression molding that includes predicted fiber displacement, resin flow, and gas bubble locations. The preform is pre-adjusted with compensation vectors that anticipate the deformation during molding, so that when compression is applied, the final structure achieves the desired precision without unexpected variations.
Solution Approach 2:
The patent implements feedback through an iterative process where the preform model is subjected to compression molding simulation, the results are analyzed to identify deviations from target structural characteristics, and adjustment vectors are computed to correct these deviations. This closed-loop feedback enables continuous refinement of the preform configuration to achieve consistent manufacturing precision.
2Strength
If tows and resin are compressed during molding, then device strength is enhanced, but gas bubbles coalesce and transit causing structural variation
Solution Approach 1:
The patent applies preliminary action by pre-positioning gas venting features and resin distribution channels in the preform model before compression. The model includes predicted gas bubble coalescence zones and resin flow paths that are pre-configured to guide resin distribution and facilitate gas escape during compression, preventing harmful gas bubble coalescence while maintaining enhanced device strength.
Solution Approach 2:
The patent uses an intermediary approach by introducing virtual adjustment vectors and compensation fields in the preform model that act as mediators between the compression forces and the fiber-resin-gas system. These intermediary structures guide the behavior of gases and resin during compression, preventing harmful coalescence while allowing the compression to effectively enhance device strength.
3Manufacturing precision
If preform model is adjusted using tow layup adjustment vectors, then manufacturing precision is improved, but computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the complex preform adjustment into discrete tow-level adjustment vectors. Instead of treating the entire preform as a single complex entity, the method segments the adjustment process into individual vector components for each tow, making the computational complexity manageable while maintaining high manufacturing precision through systematic adjustment of each segment.
Solution Approach 2:
The patent uses parameter changes by transforming the preform adjustment problem into a set of vector parameter modifications. The adjustment is expressed in terms of tow layup adjustment vectors with specific magnitude and direction parameters, allowing computational optimization through parameter space exploration rather than complex geometric manipulation, thus reducing computational complexity while improving manufacturing precision.
Data Source
AI summary
A computer-implemented method for forming a composite device of fiber-comprising tows, including: forming a first preform model having one or more anisotropic tow layup portions including fiber-comprising tows, receiving one or more mold geometrical components, receiving one or more molding force vector parameters comprising a compressive force, deforming the first preform model against the mold geometrical components using the molding force vector parameters to form an intermediate device model, forming a second preform model by adjusting the first preform model, and transmitting the second preform model to one or more systems for applying an elongate fiber tow onto an object surface, wherein adjusting the first preform model comprises cutting one or more of the tows into first tow and second tow segments to form a gap separating the first tow segment from the second tow segment along a corresponding tow path within the anisotropic tow layup portion.