Imaging Head Gas Protection for Melt Pool Size Control
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Solution Overview
Problem
Existing processing systems for objects, particularly those using Laser Metal Deposition, face challenges in accurately controlling the melt pool during additive processing, leading to inconsistencies in the formation of three-dimensional structural objects due to inadequate monitoring and control of the processing beam characteristics.
Innovation Solution
The integration of an imaging head with a deflection optical system and a gas supply unit into the processing system allows for real-time capture of the melt pool images and adjustment of the processing beam characteristics based on the captured images, enabling precise control of the melt pool formation and maintaining its target size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time imaging and control are implemented to improve melt pool monitoring precision, then manufacturing precision is improved, but device complexity increases due to additional imaging and control systems
Solution Approach 1:
The imaging head is integrated directly into the processing head, combining the imaging apparatus and processing beam delivery system into a single unified structure. This merging eliminates the need for separate imaging and processing systems, reducing overall system complexity while maintaining real-time monitoring capability.
Solution Approach 2:
The processing head is designed to serve multiple functions: it delivers the processing beam for material processing and simultaneously houses the imaging apparatus for real-time melt pool monitoring. This multi-functionality reduces the need for additional dedicated imaging equipment, thereby reducing device complexity while improving manufacturing precision.
2Reliability
If gas supply is added to protect optical surfaces from contamination, then reliability is improved, but device complexity increases due to additional gas supply components
Solution Approach 1:
The gas supply unit is integrated into the imaging head structure, combining protective gas delivery with the imaging and processing system. This integration allows the same gas supply infrastructure to serve both the processing zone and the imaging optical paths, reducing the need for separate gas supply systems and minimizing additional complexity.
Solution Approach 2:
Gas is supplied as an intermediary protective medium between the contaminant-prone processing environment and the sensitive optical surfaces. This gas barrier prevents contamination without requiring physical shields or enclosures that would increase device complexity, thereby improving reliability while maintaining system simplicity.
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 ensures consistent and accurate formation of three-dimensional structural objects by maintaining the melt pool size at a target value, improving the processing system's efficiency and adaptability to various processing systems with different standards.
Implementation Method 1
a deflection optical system configured to deflect light from at least a part of a melt pool part
Implementation Method 2
an imaging apparatus configured to optically receive the light deflected by the deflection optical system to capture an image of at least a part of the melt pool part
Data Source
AI summary
An imaging head includes: a deflection optical system configured to deflect light from at least a part of a melt pool part, the melt pool part is formed on the object by an irradiation with a processing beam from the processing head; an imaging apparatus configured to optically receive the light deflected by the deflection optical system to capture an image of at least a part of the melt pool part; and a supply unit configured to supply gas from a gas supply apparatus to at least a part of an optical surface of the deflection optical system.