3D Printed Fiber Preform Overmolding for Anisotropic Strength
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Solution Overview
Problem
Current three-dimensional printing techniques lack the ability to anisotropically orient fibers within additive manufacturing, which limits the improvement of mechanical properties in finished parts.
Innovation Solution
A method involving the additive deposition of continuous reinforcing fibers in a reinforcement volume to form a preform, which is then overmolded with a molding material, allowing for complex shapes and orientations that enhance the mechanical properties of the final product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional three-dimensional printing techniques are used, then manufacturing simplicity is maintained, but fiber orientation cannot be controlled and mechanical properties are limited
Solution Approach 1:
The manufacturing process is segmented into distinct stages: first forming a support preform, then depositing fiber reinforcement separately, and finally overmolding. This segmentation allows each stage to be optimized independently, enabling fiber orientation control without overwhelming process complexity
Solution Approach 2:
A support preform is created in advance before fiber deposition. This preliminary structure provides a foundation that guides fiber placement and enables complex fiber orientations to be achieved systematically rather than all at once
2Strength
If fiber reinforcement is added to improve mechanical properties, then strength increases, but the presence of air voids and imperfections may compromise reliability
Solution Approach 1:
The support preform is prepared in advance with proper structure and density, providing a reliable foundation that prevents void formation during subsequent fiber deposition and overmolding operations
Solution Approach 2:
The overmolding process uses controlled pressure and temperature parameters to consolidate the fiber reinforcement preform, eliminating air voids and ensuring complete impregnation of the matrix material around the fibers
3Strength
If continuous fiber reinforcement is deposited in complex shapes, then anisotropic mechanical properties are improved, but manufacturing precision requirements increase
Solution Approach 1:
The support preform is manufactured first with precise geometry that serves as a template for fiber deposition. This preliminary structure ensures that fibers are deposited along the correct paths and orientations without requiring real-time precision control during fiber placement
Solution Approach 2:
The support preform acts as an intermediary structure that translates the desired complex fiber architecture into a manufacturable form. It provides physical guidance and structural support during fiber deposition, reducing the precision requirements of the fiber laying process
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 approach enables the creation of parts with improved mechanical properties by allowing for the precise orientation of fibers, increasing strength and reducing voids within the material.
Implementation Method 1
The molding material is hardened to overmold the continuous fiber reinforcement preform
Implementation Method 2
heat from injected molding material may remelt a matrix material of the fiber reinforcement preform
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A reinforced molding is formed having an internal continuous fiber reinforcement preform embedded therein. Continuous reinforcing fiber is deposited in a reinforcement volume to form a continuous fiber reinforcement preform, and the reinforcement preform is then located within a mold of a molding apparatus. The mold is loaded with flowable and substantially isotropic molding material, e.g., by injection with heated and/or pressurized resin. The molding material is hardened (by curing or cooling or the like) to overmold the continuous fiber reinforcement preform. The resulting reinforced molding surrounds the internal continuous fiber reinforcement preform with a hardened substantially isotropic molding material.