Fiber Preform Positioning Elements for Mistake-Proof Mold Alignment
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Solution Overview
Problem
Fiber preforms are often incorrectly positioned in molds, leading to production waste, increased costs, and diminished throughput, especially when creating composite materials with three-dimensional geometries.
Innovation Solution
A fiber preform with a positioning element that engages with corresponding alignment elements on the mold to ensure proper orientation and alignment, preventing common placement errors and ensuring proper resin flow without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fiber preform is placed manually in mold, then operator can attempt to properly fit preform, but mistakes are easily made leading to incorrect positioning
Solution Approach 1:
The fiber preform incorporates asymmetric positioning elements such as tabs or protrusions that correspond to asymmetric alignment features in the mold. This asymmetric design creates a unique orientation where the preform can only be correctly positioned in one specific orientation, preventing rotational or inverted placement errors. The asymmetric geometry ensures that when the positioning elements engage with the mold features, the preform is automatically aligned in the correct position and orientation.
2Manufacturing precision
If hand layup is used to fit preform into mold with corners or inflection points, then proper fit can be attempted, but process is slow and prone to operator error
Solution Approach 1:
The positioning elements are pre-integrated into the fiber preform structure before placement in the mold. These elements perform the alignment function in advance, eliminating the need for slow manual adjustment during the molding process. The preform arrives at the mold already prepared with built-in alignment features that automatically ensure proper positioning, thereby increasing production throughput while maintaining precision.
3Manufacturing precision
If positioning element is added to preform, then proper alignment with mold is ensured, but device complexity increases
Solution Approach 1:
The positioning function is segmented from the main fiber preform body and implemented as separate, discrete positioning elements such as tabs, protrusions, or alignment features. These segmented elements can be independently designed and integrated into the preform structure. This segmentation allows the positioning functionality to be added without fundamentally redesigning the entire preform, thereby limiting the increase in overall device complexity while still achieving the alignment objective.
4Adaptability or versatility
If multiple layers of preform material are used, then complex geometries can be formed, but proper placement and fit becomes more difficult
Solution Approach 1:
Multiple layers of fiber preform material are merged or stacked together to form a multi-layered preform structure capable of representing complex three-dimensional geometries. The positioning elements are integrated into this multi-layered structure, ensuring that all layers are collectively aligned with the mold in the correct orientation. This merging approach allows the formation of complex geometries while maintaining placement accuracy through the unified positioning system.
Data Source
AI summary
A fiber preform is provided for use in an overmolding process that includes a fiber bundle arranged in a predetermined pattern and attached to itself by a plurality of stitches of a thread to form at least one preform layer. At least one positioning element is associated with the at least one preform layer, the at least one positioning element configured to engage with at least one corresponding alignment element on a mold to indicate proper positioning of the fiber preform within the mold. A process of overmolding is also provided in which the at least one positioning element of the fiber preform engages with the at least one corresponding alignment element on the mold to indicate proper positioning. The mold cavity is then filled with a resin to permeate the fiber preform engaging the mold in a unique orientation to yield an article upon resin cure.