Composite Filament 3D Printing With Complementary Reinforcement Paths
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Solution Overview
Problem
Current 3D printing technologies face challenges in efficiently depositing and reinforcing composite materials with continuous fibers, leading to issues with stress concentrations and seam formation, which affect the mechanical properties and structural integrity of printed parts.
Innovation Solution
A method and system for additive manufacturing using a multi-strand core reinforced filament with a flowable matrix material and substantially continuous reinforcing strands, where the filament is deposited in a way that the reinforcing strands are spread and consolidated using an ironing force, allowing for the creation of consolidated composite swaths with specific orientations and patterns to mitigate stress concentrations and seam formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous fiber composite reinforced 3D printing is used to deposit composite swaths, then the structural integrity and mechanical properties are improved, but stress concentrations and seam formation occur affecting the quality of printed parts
Solution Approach 1:
The patent applies preliminary action by pre-heating the deposition surface and previously deposited swaths before depositing new composite material. This pre-heating prepares the surface to receive new material, promoting better bonding and reducing seam formation. The ironing force is also applied in advance to spread reinforcing strands evenly before the material fully solidifies, preventing stress concentrations at deposition points.
Solution Approach 2:
The patent changes physical parameters during deposition, specifically temperature and pressure. The deposition surface is heated to a temperature that promotes material flow and bonding, while an ironing force is applied to compress and spread the reinforcing strands. These parameter changes ensure continuous, seamless deposition of composite swaths with proper consolidation and reduced stress concentrations.
2Reliability
If ironing force is applied to spread reinforcing strands against deposition surface, then consolidation and reduction of stress concentrations are achieved, but process complexity increases
Solution Approach 1:
The patent merges multiple functions into the deposition process itself. The ironing force application, heating, and material deposition are combined into a single integrated operation rather than separate steps. This integration achieves consolidation and stress concentration reduction without requiring additional complex equipment or processes, as the ironing force is applied through the deposition mechanism itself.
Solution Approach 2:
The deposition process serves multiple functions simultaneously - depositing material, heating the surface, applying compression force to spread strands, and promoting bonding all in one operation. The system is self-sufficient, with the deposition head itself providing the ironing force and heat, eliminating the need for separate consolidation equipment and simplifying the overall process.
3Strength
If complementary toolpaths are used to avoid stacking seams and stress concentrations, then the mechanical properties are improved, but the toolpath generation complexity increases
Solution Approach 1:
The patent applies local quality by varying the toolpath pattern in different regions of the printed part. Complementary toolpaths are used in specific areas where stress concentrations are expected, while simpler patterns may be used in other regions. This localized approach improves mechanical properties where needed without requiring complex toolpath generation throughout the entire part, reducing overall computational complexity.
Solution Approach 2:
The toolpath generation process performs preliminary analysis to identify regions prone to stress concentrations and seam formation. Based on this preliminary assessment, complementary toolpaths are automatically generated in those specific areas before deposition begins. This preliminary planning avoids the need for complex real-time adjustments during printing, simplifying the overall control system.
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 enhances the mechanical properties of printed parts by reducing stress concentrations and seam-related weaknesses, improving the structural integrity and consistency of the 3D printed structures.
Implementation Method 1
supplying a multi-strand core reinforced filament including a flowable matrix material permeating or embedding substantially continuous reinforcing strands
Implementation Method 2
applying an ironing force that spreads the reinforcing strands within the filament against a deposition surface
Data Source
AI summary
In a method for additive manufacturing, a multi-strand core reinforced filament including a flowable matrix material and substantially continuous reinforcing strands extending in a direction parallel to a length of the filament is supplied. A first consolidated composite swath of a height less than ½ the width of the filament is deposited in a first reinforcement formation including at least one straight path and at least one curved path against a deposition surface, and a second consolidated composite swath of a height less than ½ the width of the filament is deposited in a second reinforcement formation against the first consolidated composite swath. Each deposition flows the matrix material and applies an ironing force to spread the reinforcing strands within the filament against the underlying surface and/or previously deposited swath.