Additive Manufacturing Print Head with Real-Time Matrix Dosing Control
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Solution Overview
Problem
Existing continuous fiber 3D printing systems face challenges in achieving a precise matrix-to-fiber ratio, leading to structures that may be weak, brittle, flexible, or heavy due to excessive or insufficient resin usage.
Innovation Solution
The system includes a print head with a doser to coat continuous reinforcements with a matrix and a sensor to generate signals for adjusting the matrix coating, allowing for real-time feedback and feedforward control to maintain a desired matrix-to-reinforcement ratio during the additive manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing continuous fiber 3D printing systems are used to manufacture composite structures, then continuous fiber reinforcement can be achieved, but the matrix-to-fiber ratio cannot be precisely controlled resulting in weak, brittle, flexible, or heavy structures
Solution Approach 1:
The system employs a sensor to detect the actual matrix-to-fiber ratio during the additive manufacturing process and feeds this information back to a controller, which automatically adjusts the dosing rate of the matrix material. This closed-loop feedback control enables precise real-time control of the matrix-to-fiber ratio, eliminating the imprecision of existing systems and ensuring consistent structural properties.
Solution Approach 2:
The system uses the sensor output to automatically regulate its own material dosing process without external intervention. The controller modifies the dosing command based on sensor feedback, allowing the system to self-correct deviations in matrix-to-fiber ratio and maintain optimal composition throughout manufacturing.
2Strength
If excessive resin is used in composite structures, then fiber coating coverage is improved, but the structure becomes heavy and potentially flexible rather than strong
Solution Approach 1:
The sensor continuously monitors the matrix-to-fiber ratio and provides feedback to the controller, which adjusts the matrix dosing rate in real-time. This ensures that the minimum necessary amount of matrix is applied to achieve adequate fiber coating, preventing excessive resin application that would increase weight without providing proportional strength benefits.
Solution Approach 2:
The system dynamically changes the dosing parameter (matrix flow rate) based on real-time sensor feedback and process conditions. By adjusting this parameter, the system optimizes the matrix-to-fiber ratio to achieve sufficient fiber coating coverage while minimizing excess resin that would add unnecessary weight.
3Weight of moving object
If insufficient resin is used in composite structures, then structure weight is reduced, but the structure becomes weak and brittle
Solution Approach 1:
The sensor detects when the matrix-to-fiber ratio falls below the desired threshold and immediately signals the controller to increase the matrix dosing rate. This real-time feedback prevents insufficient resin application that would result in weak, brittle structures, ensuring adequate fiber coating is maintained throughout the manufacturing process.
Solution Approach 2:
The system proactively prevents insufficient resin application by continuously monitoring the matrix-to-fiber ratio and making preemptive adjustments to the dosing rate. Rather than allowing the structure to become weak and brittle, the feedback control system anticipates and corrects potential deficiencies before they affect structural integrity.
4Manufacturing precision
If real-time control of matrix coating is implemented during additive manufacturing, then manufacturing precision is improved, but device complexity increases due to additional sensors and controllers
Solution Approach 1:
While feedback control does add sensors and controllers, the patent demonstrates that this complexity is justified by the significant improvement in manufacturing precision. The sensor and controller work together as an integrated system to automatically regulate matrix dosing, achieving precise matrix-to-fiber ratio control that eliminates the need for post-manufacturing quality adjustments.
Solution Approach 2:
The system replaces manual or open-loop mechanical dosing control with an automated electronic control system that uses sensor feedback. This substitution of mechanical control with electronically controlled dosing based on real-time measurements significantly improves precision while the added electronic complexity is manageable through integrated control architecture.
Data Source
AI summary
A system is disclosed for additively manufacturing a composite structure. The system may include a support, and a print head connected to and moveable by the support. The print head may have an outlet configured to discharge a continuous reinforcement at least partially coated in a matrix, and a device located inside the print head and configured to at least partially coat the continuous reinforcement with the matrix. The system may also include a sensor configured to generate a signal indicative of an amount of the matrix, and a controller in communication with the sensor and the device. The controller may be configured to direct a command to the device to cause the device to advance matrix toward the continuous reinforcement during passage of the continuous reinforcement through the print head, and to selectively adjust the command based on the signal.