Laser Window Sealing for Atmosphere-Retained Chamber Maintenance
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Solution Overview
Problem
The existing methods for maintaining a modified atmosphere in a process chamber during laser-based metal printing processes are inefficient due to the time-consuming process of atmosphere supply and the contamination of the laser window, leading to unstable melting processes and porosity in produced pieces.
Innovation Solution
A device with a movable sealing plate and internal sealing ring creates a lock chamber around the laser window, allowing for cleaning or replacement while retaining the modified atmosphere within the process chamber, using an external guide mechanism and inflatable seals to maintain the atmosphere during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the laser window is cleaned by opening the process chamber, then the laser window can be accessed for cleaning, but the modified atmosphere is lost and must be recreated
Solution Approach 1:
The process chamber is segmented into two separate sealed chambers: a first chamber containing the laser window and a second chamber containing the processing space. This allows the laser window to be accessed and cleaned in the first chamber without affecting the atmosphere in the second chamber, eliminating the need to recreate the modified atmosphere during maintenance.
Solution Approach 2:
A transfer chamber is introduced as an intermediary between the first chamber (laser window) and second chamber (processing space). This transfer chamber allows controlled movement between chambers while maintaining atmospheric separation, enabling the laser window to be serviced without disrupting the modified atmosphere in the processing chamber.
2Reliability
If gas flow systems are built into the laser window, then contamination is reduced, but the laser window still becomes contaminated during long processes
Solution Approach 1:
The laser window is extracted from the sealed processing chamber and placed in a separate accessible first chamber. This allows the laser window to be removed, cleaned, or replaced without interrupting the continuous operation in the second chamber, enabling maintenance during long processes without affecting overall production time or process stability.
3Ease of operation
If the process chamber is opened for laser window cleaning, then the laser window can be cleaned, but the modified atmosphere cannot be retained
Solution Approach 1:
The process chamber is divided into separate sealed chambers, allowing the laser window to be cleaned in one chamber while the other chamber continues operating with its modified atmosphere intact, maintaining both ease of operation and continuous productivity.
Solution Approach 2:
The system incorporates movable sealing elements and transfer mechanisms that dynamically seal and unseal chambers as needed, allowing flexible access for cleaning while maintaining atmospheric integrity and enabling continuous operation across multiple chambers.
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
Enables the cleaning or replacement of the laser window without interrupting the process, maintaining the modified atmosphere and preventing thermal lensing, thus stabilizing the melting process and reducing porosity and roughness in the produced pieces.
Implementation Method 1
the internal sealing ring and/or the external sealing ring contain an inflatable seal
Data Source
AI summary
A device is provided for cleaning and/or replacement of a laser window of a process chamber, enclosed by an outer wall, containing a modified atmosphere, in particular a process chamber for layered printing of a 3D object by a technique such as Selective Laser Sintering (SLS), where this device features an opening in the outer wall that is fitted with the laser window and where this laser window allows a laser beam from a laser source located outside of the process chamber into the process chamber, where an external sealing ring is provided that extends between the outer wall and this laser window.A method is also provided for cleaning and/or replacement of the laser window in the opening of the outer wall of the enclosed process chamber.