Continuous Fiber Infill Control for Composite 3D Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing additive manufacturing systems lack efficient methods for controlling the deposition of continuous fibers and matrix materials, particularly in creating complex composite structures with varying infill patterns and material properties.
Innovation Solution
The method involves receiving user input for composite structure designs, automatically generating virtual models with multiple layers, and selecting appropriate infill patterns based on intended loading. The system then controls an additive manufacturing machine to deposit continuous fibers along segments of the infill patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional FDM additive manufacturing is used to create composite structures, then the process is simple and equipment is readily available, but the structural strength and material properties are limited by matrix-dependent strength
Solution Approach 1:
The patent embeds continuous fibers (carbon, glass, aramid, etc.) within the thermoplastic matrix material discharged from the print head. This composite material approach multiplies the structural strength beyond what the matrix alone can provide, while maintaining compatibility with modified FDM equipment.
Solution Approach 2:
The system enables different fiber types, orientations, and concentrations to be embedded in different regions of the printed structure. This local quality enhancement allows optimization of strength properties in specific areas where needed, while maintaining simplicity in other regions.
2Manufacturing precision
If complex composite structures with varying infill patterns are manufactured, then the structural integrity and material properties are enhanced, but the manufacturing control complexity increases
Solution Approach 1:
The manufacturing process is divided into discrete layers with independent infill pattern control. Each layer can have different infill patterns, fiber orientations, and material properties, allowing complex structures to be built from simpler segmented components that are easier to control.
Solution Approach 2:
The system dynamically adjusts infill patterns, fiber orientations, and material discharge parameters for each layer based on the specific structural requirements. This dynamic control enables precise manufacturing of complex geometries while adapting the process parameters in real-time.
3Strength
If continuous fibers are embedded within discharged material from the print head, then the strength of the structure is multiplied beyond matrix-dependent strength, but the control of fiber deposition becomes more difficult
Solution Approach 1:
The system merges the fiber feed mechanism with the existing thermoplastic extrusion system. Fibers are embedded within the matrix material as it discharges from the print head, combining two material streams into a single integrated deposition process that leverages the existing extrusion control infrastructure.
Solution Approach 2:
The thermoplastic matrix acts as an intermediary carrier that transports and deposits fibers in the desired pattern. The matrix material facilitates fiber handling and placement, making fiber deposition control easier by using the existing molten plastic flow as a medium to carry the fibers.
4Adaptability or versatility
If unsupported structures are fabricated in free space with quick curing, then the manufacturing flexibility and design freedom increase, but the curing process control becomes more critical
Solution Approach 1:
The system utilizes the phase transition of the thermoplastic matrix from molten to solidified state as it cools and hardens. This phase change provides natural support for unsupported structures in free space, eliminating the need for additional curing mechanisms while maintaining manufacturing flexibility.
Data Source
AI summary
A method is disclosed for additively manufacturing a composite structure. The method may include receiving from a user a sketch of a cross-section of the composite structure and a desired height. The method may also include automatically generating a virtual model of the composite structure having a plurality of layers, each with a thickness related to the height. The method may further include receiving from the user at least one infill pattern for at least one of the plurality of layers, and causing an additive manufacturing machine to deposit a continuous fiber along segments of the at least one infill pattern.