Laser Standoff Control for Stable Directed Energy Deposition
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Solution Overview
Problem
Existing directed energy deposition additive manufacturing systems face challenges in accurately controlling the standoff distance due to factors like substrate distortion, uneven workpiece height, and complex process variations, leading to inconsistent plasma arc characteristics and reduced workpiece quality.
Innovation Solution
Implementing a standoff distance monitoring and control system using a laser triangulation system or laser line scanner to dynamically and real-time adjust the standoff distance based on workpiece geometry, enabling precise and automated control of plasma arc characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage measurements are used to indirectly control standoff distance, then control can be implemented, but measurement precision deteriorates due to noise and sensitivity to variations
Solution Approach 1:
The patent replaces voltage-based indirect measurement with direct optical measurement using a laser line scanner. The laser scanner directly measures the physical distance between the plasma torch and workpiece surface, eliminating the need to infer standoff distance from voltage readings. This substitution of measurement methodology resolves the contradiction by providing direct, precise measurement without the noise and sensitivity issues inherent in voltage-based indirect control.
2Stability of the object's composition
If standoff distance is maintained within a range, then plasma arc characteristics can be sustained, but manufacturing precision deteriorates due to cumulative errors over workpiece layers
Solution Approach 1:
The patent implements a closed-loop feedback system where the laser line scanner continuously measures the actual workpiece surface geometry, and this measurement feedback is used to dynamically adjust the plasma torch position in real-time. This active feedback control prevents cumulative errors from building up across layers by constantly correcting the standoff distance based on actual measurements, thereby maintaining both plasma arc stability and manufacturing precision.
Solution Approach 2:
The system transitions from static standoff distance control to dynamic adjustment. The laser line scanner enables real-time detection of workpiece geometry changes, and the system dynamically adjusts the plasma torch position accordingly. This dynamic approach allows the standoff distance to be continuously optimized for each location and layer, preventing cumulative errors while maintaining consistent plasma arc characteristics throughout the build process.
3Adaptability or versatility
If manual adjustment by human operator is used, then flexibility can be achieved, but productivity deteriorates due to subjective visual feedback and slower adjustment
Solution Approach 1:
The system implements self-service automation where the laser line scanner automatically measures workpiece geometry and the control system automatically adjusts plasma torch position without human intervention. The system serves itself by continuously monitoring and correcting its own operation, eliminating the need for manual visual inspection and adjustment. This maintains adaptability through automated decision-making while dramatically improving productivity by operating at machine speed rather than human reaction speed.
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 system provides consistent plasma arc characteristics, reduces scrap rates, shortens part development cycles, and enhances workpiece quality by eliminating errors associated with voltage-based measurements.
Implementation Method 1
a laser line scanner (LLS) which reads a geometric profile of the workpiece
Implementation Method 2
the LLS optically reading the substrate and the workpiece
Implementation Method 3
a directed energy source generates an energy and the energy melts the additive manufacturing material
Implementation Method 4
the energy melts the additive manufacturing material onto the substrate
Data Source
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AI summary
Additive manufacturing systems with standoff distance monitoring and control, which can be responsive, dynamic, and in real-time. These technologies can use a standoff distance measurement system to real-time monitor, read, or interrogate a workpiece or a substrate on which the workpiece is positioned, as the workpiece is moved past a directed energy source, or vice versa. These technologies can use a feedback controller to responsively and dynamically control the standoff distance in real-time based on data from the standoff distance measurement system.