Laser Metal Deposition Distance Sensing for Stable Melt Pools
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Solution Overview
Problem
Laser metal deposition processes face challenges in maintaining desired dimensions and quality due to variations in the state of the melt pool caused by inconsistent laser power and substrate temperature, leading to defects in the 3D printing process.
Innovation Solution
A laser device equipped with a force sensor to measure the force exerted by the metallic wire and an optional resistance sensor to monitor the electrical resistance between the wire and substrate, providing indications for adjusting the distance between the delivery opening and the substrate, thereby allowing for real-time adjustments to the laser metal deposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser power is increased to melt feedstock faster, then productivity is improved, but manufacturing precision deteriorates due to excessive melt pool temperature causing material spreading
Solution Approach 1:
The patent employs sensors (optical, thermal, or force sensors) to monitor the melt pool state and provides real-time feedback to the control system. Based on this feedback, the laser power is dynamically adjusted to maintain optimal deposition conditions, resolving the contradiction between high productivity and precision by adapting power levels to actual process conditions.
Solution Approach 2:
The system transitions from static laser power settings to dynamic power adjustment. The laser power is continuously modified based on real-time monitoring of melt pool characteristics, allowing the system to adapt to varying conditions and maintain precision while optimizing deposition rate.
2Manufacturing precision
If laser power is decreased to reduce material spreading, then manufacturing precision is improved, but productivity deteriorates due to insufficient feedstock melting
Solution Approach 1:
Real-time monitoring of melt pool state through sensors enables the control system to detect when power is insufficient and increase it accordingly, maintaining both precision and productivity through adaptive power adjustment based on actual process conditions.
Solution Approach 2:
The system dynamically changes laser power parameters based on monitored melt pool characteristics, transitioning from fixed power levels to variable power settings that optimize both deposition rate and dimensional accuracy under different operating conditions.
3Productivity
If laser beam is directed more to the wire for faster melting, then productivity is improved, but manufacturing precision deteriorates due to inconsistent melt pool state
Solution Approach 1:
The system dynamically adjusts the distribution of laser power between wire and substrate based on real-time monitoring of melt pool state. This dynamic power distribution maintains consistent melt pool conditions while optimizing overall deposition rate, resolving the contradiction between productivity and consistency.
4Manufacturing precision
If real-time monitoring and adjustment systems are added, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent integrates sensors and control systems that provide real-time feedback on melt pool state and automatically adjust process parameters. This feedback mechanism improves deposition quality by maintaining optimal conditions, accepting the necessary increase in system complexity as a trade-off for precision.
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 solution enables more reliable monitoring and adjustment of the laser metal deposition process, reducing defects by accounting for the state of the melt pool and ensuring accurate deposition of metallic wire, thus improving the quality and consistency of the 3D printed components.
Implementation Method 1
a laser beam source configured to emit a laser beam for fusing the metallic wire with the substrate
Implementation Method 2
The laser beam heats the substrate and melts it locally, creating a melt pool. The feedstock is supplied to the melt pool and is also melted.
Implementation Method 3
a force sensor for measuring a parameter indicative of a force exerted on the laser device by the metallic wire
Data Source
AI summary
The present disclosure relates to laser devices for laser metal deposition and methods for laser metal deposition. A laser device for laser metal deposition on a substrate is provided. The laser device comprises a delivery opening for delivering a metallic wire to the substrate, a laser beam source configured to emit a laser beam for fusing the metallic wire with the substrate, and a force sensor for measuring a parameter indicative of a force exerted on the laser device by the metallic wire. The laser device is configured to obtain a first indication related to a distance between the delivery opening and the substrate based on the parameter indicative of a force exerted on the laser device by the metallic wire. Methods for laser metal deposition are also provided.