In-Situ Spectrometer Control for Defect-Aware Additive Manufacturing
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Solution Overview
Problem
Additive Manufacturing (AM) faces challenges in achieving high-quality parts due to process variability, defects, and inefficiencies in real-time inspection and certification, particularly for high-value and mission-critical applications, where conventional metrology methods are time-consuming and costly, leading to material waste and prolonged production times.
Innovation Solution
The implementation of in-situ, spectrally and spatially resolved interrogation systems that modulate process parameters in real-time, using imaging spectrometers to monitor temperature, emissivity, and other parameters, enabling closed-loop control of AM processes to ensure accurate quality assessment and process control, allowing for adjustments during printing to prevent defects and optimize component properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metrology and non-destructive testing methods are used to inspect AM parts after fabrication, then quality assurance is achieved, but inspection time increases to 4-8 hours per part and production efficiency decreases
Solution Approach 1:
The system performs quality inspection during the additive manufacturing process itself, before the part is complete. The optical sensor detects defects, dimensional deviations, and process anomalies in real-time, allowing quality assurance to be built into the manufacturing process rather than added as a post-processing step.
Solution Approach 2:
The system continuously monitors the AM process using optical sensing and provides real-time feedback to the control system. This feedback enables dynamic adjustment of process parameters to correct deviations and prevent defects, achieving quality assurance through active process control rather than passive post-inspection.
2Manufacturing precision
If real-time process control is implemented during AM manufacturing, then manufacturing precision and quality consistency improve, but system complexity and initial cost increase
Solution Approach 1:
The system replaces complex mechanical measurement systems with optical sensing technology. The optical sensor non-contactingly measures dimensional parameters, temperature, and process characteristics, eliminating the need for physical probes and complex mechanical measurement apparatus while achieving high precision.
Solution Approach 2:
The optical sensing system performs multiple functions simultaneously: dimensional measurement, temperature monitoring, defect detection, and process characterization. This multi-functionality reduces the need for separate specialized devices, thereby limiting the increase in system complexity despite the advanced capabilities provided.
3Reliability
If post-build inspection is performed on completed parts, then defects are detected, but material waste increases when parts fail inspection and must be discarded
Solution Approach 1:
The system detects defects during the manufacturing process before the part is complete. By identifying defects early in the build process, the system enables interruption of manufacturing before excessive material is deposited, preventing waste of both material and energy that would be required to complete and then discard a defective part.
Solution Approach 2:
The system enables rapid detection and response to defects during manufacturing, allowing the process to be interrupted immediately upon defect detection. This eliminates the time and material investment that would otherwise be wasted completing the build of a part that will ultimately fail inspection.
4Reliability
If conventional inspection methods are used, then cost-effective quality checking is achieved for standard applications, but high-value and mission-critical applications require more sophisticated and expensive inspection systems
Solution Approach 1:
The optical sensing system provides a universal platform that can detect various defect types (porosity, cracks, dimensional deviations, surface defects) and monitor multiple process parameters simultaneously. This multi-functional capability delivers sophisticated quality control for mission-critical applications while maintaining relative cost-effectiveness through the use of optical technology rather than multiple specialized inspection devices.
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 reduces variability in AM component properties, enables real-time quality control, minimizes material waste, and enhances the efficiency of producing high-quality parts by allowing for immediate adjustments during the manufacturing process, thereby improving the accuracy and reliability of AM parts for critical applications.
Implementation Method 1
in-situ, spectrally and spatially resolved interrogation of the process... imaging spectrometers to monitor temperature, emissivity
Data Source
AI summary
Systems, devices, and methods for additive manufacturing are provided that allow for components being manufactured to be assessed during the printing process. As a result, changes to a print plan can be considered, made, and implemented during the printing process. More particularly, in exemplary embodiments, a spectrometer is operated while a component is being printed to measure one or more parameters associated with one or more layers of the component being printed. The measured parameter(s) are then relied upon to determine if any changes are needed to the way printing is occurring, and if such changes are desirable, the system is able to implement such changes during the printing process. By way of non-limiting examples, printed material in one or more layers may be reheated to alter the printed component, such as to remove defects identified by the spectrometer data. A variety of systems, devices, and methods for performing real-time sensing and control of an additive manufacturing process are also provided.