3D Printer Eddy Current Sensing for In-Process Defect Repair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional additive manufacturing (AM) systems face challenges in real-time quality assurance, as defects in 3D printed parts can go unnoticed or be difficult to correct, leading to misshapen or defective products, and existing post-processing techniques are time-consuming and inefficient.
Innovation Solution
The integration of sensor systems, such as eddy current sensors, into 3D printers that allow for real-time detection and correction of defects during the printing process, enabling in situ repairs and reducing overall post-processing times by providing immediate data on electromagnetic characteristics and geometry anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional post-processing techniques are used to detect and correct defects after printing, then defect detection capability is provided, but manufacturing time is significantly increased and defects may be inaccessible
Solution Approach 1:
The patent implements real-time defect detection during the additive manufacturing process using sensors (optical, electromagnetic, acoustic) that monitor the build piece as it is being formed. This preliminary detection allows defects to be identified while the part is still accessible and can be corrected during printing, eliminating the need for time-consuming post-processing inspection and enabling immediate corrective actions such as selective remelting or material deposition to repair defects.
2Measurement precision
If real-time sensor systems are integrated into the 3D printer, then defect detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple types of sensors (optical, electromagnetic, acoustic) into a unified monitoring system that can detect various defect types through a single integrated platform. The system uses multi-functionality to perform both process monitoring and defect detection, reducing the need for separate specialized equipment and managing complexity through consolidated system architecture while maintaining high detection accuracy across different defect types.
3Ease of repair
If conventional post-processing operations are performed to correct defects, then defect correction is attempted, but manufacturing latency is worsened and overall processing time increases
Solution Approach 1:
The system performs preliminary defect detection and enables corrective actions during the printing process itself, rather than after completion. The integrated sensor system identifies defects while the build piece is still accessible, and the 3D printer can immediately apply corrections such as selective remelting, additional material deposition, or parameter adjustments to repair defects before the part is finished, thereby maintaining productivity while enabling effective defect correction.
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 quality and accuracy of 3D printed parts by allowing for immediate defect detection and correction, reducing post-processing times, and creating a database for future prints, ensuring parts meet specified tolerances and geometrical accuracy.
Implementation Method 1
a sensor configured to move relative to a surface of the build piece and to measure an electromagnetic characteristic of the portion of the build piece
Implementation Method 2
an energy beam source configured to selectively melt the metal to form a portion of a build piece
Data Source
AI summary
In various aspects, 3D printers and recoaters incorporate sensor systems coupled to or integrated with the 3D printers. The sensor systems may include eddy current sensors and other sensors configured to measure an electromagnetic characteristic of the build piece. A three-dimensional (3-D) printer in one aspect includes a depositor configured to deposit metal, an energy beam source configured to selectively melt the metal to form a portion of a build piece, and a sensor configured to move relative to a surface of the print area and to measure an electromagnetic characteristic of the portion of the print area. The measured data can be used to detect defects and other information about the build piece that can be used to fix the defects or enhance the build piece geometry during the printing.