3D Printing Chamber Pressure Zoning for Beam Path Cleanliness
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Solution Overview
Problem
Existing methods for producing three-dimensional objects through selective laser sintering or melting face issues with contaminants like spatter, smoke, and condensates that contaminate the device and reduce the effectiveness of the radiation used for solidification, leading to partial loss of building material and increased cleaning efforts.
Innovation Solution
A method involving a process chamber with a hollow body that creates a pressure difference to direct gas flow and remove contaminants, ensuring they are not entrained in the radiation path, thereby reducing contamination and maintaining process stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gas is supplied and discharged to create pressure difference for contaminant removal, then contamination in critical areas is reduced, but device complexity increases due to additional gas supply and discharge systems
Solution Approach 1:
The process chamber is divided into two pressure zones by the hollow body: a first region (outside hollow body) at higher pressure and a second region (inside hollow body) at lower pressure. This segmentation creates a pressure gradient that drives gas flow from the first region through the beam path area into the second region, effectively removing contaminants from the critical beam path area without requiring complex active extraction systems throughout the entire chamber.
Solution Approach 2:
The hollow body acts as an intermediary structure that defines the pressure zones and guides gas flow. It serves as a physical mediator that separates the chamber into different pressure regions, allowing contaminants to be naturally directed away from the beam path through the pressure difference created by this intermediate structure.
2Productivity
If strong gas flow is used to remove contaminants, then contaminant removal efficiency increases, but particles of applied layer may be entrained and affect object properties
Solution Approach 1:
The gas flow and pressure difference are applied locally in specific regions rather than uniformly throughout the entire chamber. The hollow body creates a localized low-pressure zone that attracts gas flow through the beam path area, providing effective contaminant removal precisely where needed (in and around the hollow body) without creating strong turbulent flows that would disturb the applied powder layer in other critical areas.
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 effectively minimizes contamination within the device, reduces cleaning efforts, and ensures efficient solidification by preventing disruptive particles from interfering with the radiation, thus enhancing the production of three-dimensional objects.
Implementation Method 1
Gas is supplied to the process chamber and gas is discharged from the process chamber in such a way that the pressure in the area of the process chamber that is inside the hollow body is lower than in the area of the process chamber that is outside the hollow body
Data Source
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AI summary
The invention relates to a method and to a device for producing a three-dimensional object (2) by application in layers and selective bonding of a build-up material (15) by means of the effect of a beam. A hollow body (30) is arranged in a process chamber (3) above a construction field (8) and extends substantially from the construction field (8) in the direction of an upper side of the wall (4) of the process chamber (3). The process chamber (3) is supplied with gas and gas is extracted from the process chamber (3) in such a way that in the region of the process chamber (3) lying inside the hollow body (30) a lower pressure prevails than in the region of the process chamber (3) lying outside the hollow body (30).